[Winpcap-users] Winpcap-users Digest, Vol 72, Issue 10

Wed Mar 23 18:04:30 PDT 2011

Akif,

Changing the kernel buffer size will not help at all (it doesn't influence when the application is notified that packets are available). Do the timestamps in wireshark look ok? When capturing from PPP, packets are actually captured by the Microsoft Netmon API, and it's entirely possible that the delay/buffering is introduced by Netmon itself, for which we have very little control.

Have a nice day
GV

From: winpcap-users-bounces at winpcap.org [mailto:winpcap-users-bounces at winpcap.org] On Behalf Of Akif Usman
Sent: Wednesday, March 16, 2011 11:57 AM
To: winpcap-users at winpcap.org
Subject: Re: [Winpcap-users] Winpcap-users Digest, Vol 72, Issue 10

HI GV,

Yes actually i am looking at the timestamps in wireshark. Although there is one thing i noted when i reduced the time out in pcap_open. First i saw that the latency reduced from 0.5s to 0.2-0.3s but then it increased again with the same parameters. This is very strange behavior in pcap. Then i tried my best to achieve low latency by changing the timeout even more but still the delay is 0.5. Is there a possibility that i can reduce the kernel buffer size and achieve a good latency because i feel the packets get buffered, such that i get about 200packets with proper latency and then at once i get a jump of 0.5 seconds. Any Any ideas you think , that would improve the program delay?

Best Regards
Akif

> From: winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org>
> Subject: Winpcap-users Digest, Vol 72, Issue 10
> To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org>
> Date: Wed, 16 Mar 2011 08:41:09 -0700
>
> Send Winpcap-users mailing list submissions to
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> When replying, please edit your Subject line so it is more specific
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>
>
> Today's Topics:
>
> 1. Re: Winpcap-users Digest, Vol 72, Issue 8 (Gianluca Varenni)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 16 Mar 2011 08:41:08 -0700
> From: Gianluca Varenni <Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com>>
> To: "winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org>" <winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org>>
> Subject: Re: [Winpcap-users] Winpcap-users Digest, Vol 72, Issue 8
> Message-ID:
> <6A8F2E88CFF83C43A6AFF7FAC775B9FC0715226C1C at MAILBOXES2.nbttech.com<mailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC0715226C1C at MAILBOXES2.nbttech.com>>
> Content-Type: text/plain; charset="us-ascii"
>
> I believe you are looking at the timestamps of the packets in wireshark, not when wireshark actually receives the packets from the WinPcap library. They are different. WinPcap timestamps the packets in the driver as soon as they arrive, but for performance reasons, it can deliver them with a certain delay. Are you looking at the timestamps in Wireshark?
>
> Have a nice day
> GV
>
> From: winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org> [mailto:winpcap-users-bounces at winpcap.org]<mailto:[mailto:winpcap-users-bounces at winpcap.org]> On Behalf Of Akif Usman
> Sent: Wednesday, March 16, 2011 2:22 AM
> To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org>
> Subject: Re: [Winpcap-users] Winpcap-users Digest, Vol 72, Issue 8
>
> Hi,
>
> The only thing that amazes me is Wireshark. Why is wireshark able to capture with such accuracy even if it uses winpcap.
>
> Is it possible to achieve accuracy if i used packet.h functions to receive and then pcap to send the packets. Anton have you tried that?
>
> BR
>
>
> > From: winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org%3cmailto:winpcap-users-request at winpcap.org>>
> > Subject: Winpcap-users Digest, Vol 72, Issue 8
> > To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > Date: Wed, 16 Mar 2011 02:08:28 -0700
> >
> > Send Winpcap-users mailing list submissions to
> > winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> >
> > To subscribe or unsubscribe via the World Wide Web, visit
> > https://www.winpcap.org/mailman/listinfo/winpcap-users
> > or, via email, send a message with subject or body 'help' to
> > winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org%3cmailto:winpcap-users-request at winpcap.org>>
> >
> > You can reach the person managing the list at
> > winpcap-users-owner at winpcap.org<mailto:winpcap-users-owner at winpcap.org<mailto:winpcap-users-owner at winpcap.org%3cmailto:winpcap-users-owner at winpcap.org>>
> >
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of Winpcap-users digest..."
> >
> >
> > Today's Topics:
> >
> > 1. Re: PPP capture (Gianluca Varenni)
> > 2. Re: Winpcap-users Digest, Vol 72, Issue 7 (Akif Usman)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Tue, 15 Mar 2011 13:59:25 -0700
> > From: Gianluca Varenni <Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com%3cmailto:Gianluca.Varenni at riverbed.com>>>
> > To: Anton Tremsin <ast at ssl.berkeley.edu<mailto:ast at ssl.berkeley.edu<mailto:ast at ssl.berkeley.edu%3cmailto:ast at ssl.berkeley.edu>>>, "winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org><mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org%3e>"
> > <winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>>
> > Subject: Re: [Winpcap-users] PPP capture
> > Message-ID:
> > <6A8F2E88CFF83C43A6AFF7FAC775B9FC07151743D9 at MAILBOXES2.nbttech.com<mailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC07151743D9 at MAILBOXES2.nbttech.com<mailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC07151743D9 at MAILBOXES2.nbttech.com%3cmailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC07151743D9 at MAILBOXES2.nbttech.com>>>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Anton,
> >
> > If I remember well, you are capturing from Ethernet, Akif is capturing from PPP. The code paths for the two types of devices are completely different (Ethernet goes through the WinPcap kernel driver, PPP gets captured through Netmon).
> >
> > Have a nice day
> > GV
> >
> > From: Anton Tremsin [mailto:ast at ssl.berkeley.edu]<mailto:[mailto:ast at ssl.berkeley.edu]><mailto:[mailto:ast at ssl.berkeley.edu]>
> > Sent: Monday, March 14, 2011 11:43 PM
> > To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > Cc: Gianluca Varenni
> > Subject: Re: [Winpcap-users] PPP capture
> >
> > Akif, Gianluca,
> >
> > As I mentioned in my previous messages, I have exactly the same problem of delayed packages, with mintocopy set even to 0 (tried other values as well). I am always sending a set of 64 packets of 8Kbytes each (that is one image data). The packets are not lost, they always arrive. However, some of them come with no delay (varied number of them, sometimes 62, sometimes 57, etc), while the rest of them come exactly after the delay equal to the setting of the timeout, which I varied between 1 and 10000 milliseconds. There is no timeout reported for the packets to arrive with the delay.
> >
> > I will be very glad if that issue can be solved, which has probably the same cause as in Akif's application.
> >
> > Thanks a lot,
> >
> > Anton
> >
> > Akif,
> >
> > This is probably due to the mintocopy and timeout of WinPcap. WinPcap does not deliver you the packets immediately after they are received by the driver. Packets are batched in kernel mode and delivered to the receiving application when
> >
> >
> > There are at least mintocopy bytes in the kernel buffer
> >
> > After a certain timeout
> > (whatever happens first).
> >
> > In order to reduce the delay, you will need to either reduce the timeout or the mintocopy.
> >
> > Have a nice day
> > GV
> >
> > From: winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org%3cmailto:winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org%3cmailto:winpcap-users-bounces at winpcap.org%3cmailto:winpcap-users-bounces at winpcap.org%3cmailto:winpcap-users-bounces at winpcap.org>>> [mailto:winpcap-users-bounces at winpcap.org]<mailto:[mailto:winpcap-users-bounces at winpcap.org]><mailto:[mailto:winpcap-users-bounces at winpcap.org]> On Behalf Of Akif Usman
> > Sent: Thursday, March 10, 2011 11:20 AM
> > To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>>
> > Subject: [Winpcap-users] PPP capture
> >
> > HI,
> >
> > I have installed the winpcap version 3.1 beta and i am capturing from a PPP interface and it captures perfectly. Now i am trying to capture from the same PPP interface using my LIBPCAP program and forward it to another Ethernet interface that connects further to a second computer (Ethernet NIC) which also has wireshark running on it. When i capture from the second computer i get a strange offset of 0.5 seconds after every x packets. This is very strange. I dont know why wireshark is able to capture from PPP interface on the first computer with proper accuracy and why my LIBPCAP program, which is just forwarding the packets, is introducing a 0.5s [:-O] delay. Please help me out as soon as somebody can.
> >
> > Best Regards
> > Fika
> >
> >
> >
> >
> >
> > _______________________________________________
> >
> > Winpcap-users mailing list
> >
> > Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org%3cmailto:Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org%3cmailto:Winpcap-users at winpcap.org%3cmailto:Winpcap-users at winpcap.org%3cmailto:Winpcap-users at winpcap.org>>>
> >
> > https://www.winpcap.org/mailman/listinfo/winpcap-users
> >
> >
> >
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> >
> > ------------------------------
> >
> > Message: 2
> > Date: Wed, 16 Mar 2011 10:08:25 +0100
> > From: Akif Usman <akif.usman at hotmail.com<mailto:akif.usman at hotmail.com<mailto:akif.usman at hotmail.com%3cmailto:akif.usman at hotmail.com>>>
> > To: <winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>>
> > Subject: Re: [Winpcap-users] Winpcap-users Digest, Vol 72, Issue 7
> > Message-ID: <SNT143-w3812119493BFBBEDF1C2EC80CE0 at phx.gbl<mailto:SNT143-w3812119493BFBBEDF1C2EC80CE0 at phx.gbl<mailto:SNT143-w3812119493BFBBEDF1C2EC80CE0 at phx.gbl%3cmailto:SNT143-w3812119493BFBBEDF1C2EC80CE0 at phx.gbl>>>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> >
> > HI,
> > There are some questiosn i need to ask. Why does wireshark give no delay upon capture even though it uses Winpcap?
> > I am using windows xp for capture and i have checked the capture on ethernet and there seems to be no problems at all from the capture on ethernet. I have tried changing mintocopy and the timeout but it gives me no changes in the performance? Any ideas why?
> >
> > BR
> >
> > > From: winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org%3cmailto:winpcap-users-request at winpcap.org>>
> > > Subject: Winpcap-users Digest, Vol 72, Issue 7
> > > To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > > Date: Tue, 15 Mar 2011 12:00:02 -0700
> > >
> > > Send Winpcap-users mailing list submissions to
> > > winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > >
> > > To subscribe or unsubscribe via the World Wide Web, visit
> > > https://www.winpcap.org/mailman/listinfo/winpcap-users
> > > or, via email, send a message with subject or body 'help' to
> > > winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org<mailto:winpcap-users-request at winpcap.org%3cmailto:winpcap-users-request at winpcap.org>>
> > >
> > > You can reach the person managing the list at
> > > winpcap-users-owner at winpcap.org<mailto:winpcap-users-owner at winpcap.org<mailto:winpcap-users-owner at winpcap.org%3cmailto:winpcap-users-owner at winpcap.org>>
> > >
> > > When replying, please edit your Subject line so it is more specific
> > > than "Re: Contents of Winpcap-users digest..."
> > >
> > >
> > > Today's Topics:
> > >
> > > 1. Re: PPP capture (Gianluca Varenni)
> > > 2. Re: PPP capture (Anton Tremsin)
> > >
> > >
> > > ----------------------------------------------------------------------
> > >
> > > Message: 1
> > > Date: Mon, 14 Mar 2011 18:44:54 -0700
> > > From: Gianluca Varenni <Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com%3cmailto:Gianluca.Varenni at riverbed.com>>>
> > > To: "winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org><mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org%3e>" <winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>>
> > > Subject: Re: [Winpcap-users] PPP capture
> > > Message-ID:
> > > <6A8F2E88CFF83C43A6AFF7FAC775B9FC07151739AA at MAILBOXES2.nbttech.com<mailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC07151739AA at MAILBOXES2.nbttech.com<mailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC07151739AA at MAILBOXES2.nbttech.com%3cmailto:6A8F2E88CFF83C43A6AFF7FAC775B9FC07151739AA at MAILBOXES2.nbttech.com>>>
> > > Content-Type: text/plain; charset="us-ascii"
> > >
> > > Akif,
> > >
> > > This is probably due to the mintocopy and timeout of WinPcap. WinPcap does not deliver you the packets immediately after they are received by the driver. Packets are batched in kernel mode and delivered to the receiving application when
> > >
> > >
> > > - There are at least mintocopy bytes in the kernel buffer
> > >
> > > - After a certain timeout
> > > (whatever happens first).
> > >
> > > In order to reduce the delay, you will need to either reduce the timeout or the mintocopy.
> > >
> > > Have a nice day
> > > GV
> > >
> > > From: winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org%3cmailto:winpcap-users-bounces at winpcap.org>> [mailto:winpcap-users-bounces at winpcap.org]<mailto:[mailto:winpcap-users-bounces at winpcap.org]><mailto:[mailto:winpcap-users-bounces at winpcap.org]> On Behalf Of Akif Usman
> > > Sent: Thursday, March 10, 2011 11:20 AM
> > > To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > > Subject: [Winpcap-users] PPP capture
> > >
> > > HI,
> > >
> > > I have installed the winpcap version 3.1 beta and i am capturing from a PPP interface and it captures perfectly. Now i am trying to capture from the same PPP interface using my LIBPCAP program and forward it to another Ethernet interface that connects further to a second computer (Ethernet NIC) which also has wireshark running on it. When i capture from the second computer i get a strange offset of 0.5 seconds after every x packets. This is very strange. I dont know why wireshark is able to capture from PPP interface on the first computer with proper accuracy and why my LIBPCAP program, which is just forwarding the packets, is introducing a 0.5s [:-O] delay. Please help me out as soon as somebody can.
> > >
> > > Best Regards
> > > Fika
> > > -------------- next part --------------
> > > An HTML attachment was scrubbed...
> > > URL: <http://www.winpcap.org/pipermail/winpcap-users/attachments/20110314/fcd4e478/attachment-0001.html>
> > >
> > > ------------------------------
> > >
> > > Message: 2
> > > Date: Mon, 14 Mar 2011 23:42:30 -0700
> > > From: Anton Tremsin <ast at ssl.berkeley.edu<mailto:ast at ssl.berkeley.edu<mailto:ast at ssl.berkeley.edu%3cmailto:ast at ssl.berkeley.edu>>>
> > > To: winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > > Cc: Gianluca Varenni <Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com<mailto:Gianluca.Varenni at riverbed.com%3cmailto:Gianluca.Varenni at riverbed.com>>>
> > > Subject: Re: [Winpcap-users] PPP capture
> > > Message-ID: <4D7F0A56.1070207 at ssl.berkeley.edu<mailto:4D7F0A56.1070207 at ssl.berkeley.edu<mailto:4D7F0A56.1070207 at ssl.berkeley.edu%3cmailto:4D7F0A56.1070207 at ssl.berkeley.edu>>>
> > > Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
> > >
> > > Akif, Gianluca,
> > >
> > > As I mentioned in my previous messages, I have exactly the same problem
> > > of delayed packages, with mintocopy set even to 0 (tried other values as
> > > well). I am always sending a set of 64 packets of 8Kbytes each (that is
> > > one image data). The packets are not lost, they always arrive. However,
> > > some of them come with no delay (varied number of them, sometimes 62,
> > > sometimes 57, etc), while the rest of them come exactly after the delay
> > > equal to the setting of the timeout, which I varied between 1 and 10000
> > > milliseconds. There is no timeout reported for the packets to arrive
> > > with the delay.
> > >
> > > I will be very glad if that issue can be solved, which has probably the
> > > same cause as in Akif's application.
> > >
> > > Thanks a lot,
> > >
> > > Anton
> > > >
> > > > Akif,
> > > >
> > > > This is probably due to the mintocopy and timeout of WinPcap. WinPcap
> > > > does not deliver you the packets immediately after they are received
> > > > by the driver. Packets are batched in kernel mode and delivered to the
> > > > receiving application when
> > > >
> > > > - There are at least mintocopy bytes in the kernel buffer
> > > >
> > > > - After a certain timeout
> > > >
> > > > (whatever happens first).
> > > >
> > > > In order to reduce the delay, you will need to either reduce the
> > > > timeout or the mintocopy.
> > > >
> > > > Have a nice day
> > > >
> > > > GV
> > > >
> > > > *From:* winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org<mailto:winpcap-users-bounces at winpcap.org%3cmailto:winpcap-users-bounces at winpcap.org>>
> > > > [mailto:winpcap-users-bounces at winpcap.org]<mailto:[mailto:winpcap-users-bounces at winpcap.org]><mailto:[mailto:winpcap-users-bounces at winpcap.org]> *On Behalf Of *Akif Usman
> > > > *Sent:* Thursday, March 10, 2011 11:20 AM
> > > > *To:* winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org<mailto:winpcap-users at winpcap.org%3cmailto:winpcap-users at winpcap.org>>
> > > > *Subject:* [Winpcap-users] PPP capture
> > > >
> > > > HI,
> > > >
> > > > I have installed the winpcap version 3.1 beta and i am capturing from
> > > > a PPP interface and it captures perfectly. Now i am trying to capture
> > > > from the same PPP interface using my LIBPCAP program and forward it to
> > > > another Ethernet interface that connects further to a second computer
> > > > (Ethernet NIC) which also has wireshark running on it. When i capture
> > > > from the second computer i get a strange offset of 0.5 seconds after
> > > > every x packets. This is very strange. I dont know why wireshark is
> > > > able to capture from PPP interface on the first computer with proper
> > > > accuracy and why my LIBPCAP program, which is just forwarding the
> > > > packets, is introducing a 0.5s [:-O] delay. Please help me out as soon
> > > > as somebody can.
> > > >
> > > > Best Regards
> > > >
> > > > Fika
> > > >
> > > >
> > > > _______________________________________________
> > > > Winpcap-users mailing list
> > > > Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org%3cmailto:Winpcap-users at winpcap.org>>
> > > > https://www.winpcap.org/mailman/listinfo/winpcap-users
> > > >
> > >
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> > >
> > > ------------------------------
> > >
> > > _______________________________________________
> > > Winpcap-users mailing list
> > > Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org<mailto:Winpcap-users at winpcap.org%3cmailto:Winpcap-users at winpcap.org>>
> > > https://www.winpcap.org/mailman/listinfo/winpcap-users
> > >
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> > > End of Winpcap-users Digest, Vol 72, Issue 7
> > > ********************************************
> >
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> >
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> > End of Winpcap-users Digest, Vol 72, Issue 8
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