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HI,<div><br></div><div>There are some questiosn i need to ask. Why does wireshark give no delay upon capture even though it uses Winpcap? </div><div><br></div><div>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?</div><div><br></div><div><br></div><div>BR<br><br>> From: winpcap-users-request@winpcap.org<br>> Subject: Winpcap-users Digest, Vol 72, Issue 7<br>> To: winpcap-users@winpcap.org<br>> Date: Tue, 15 Mar 2011 12:00:02 -0700<br>> <br>> Send Winpcap-users mailing list submissions to<br>> winpcap-users@winpcap.org<br>> <br>> To subscribe or unsubscribe via the World Wide Web, visit<br>> https://www.winpcap.org/mailman/listinfo/winpcap-users<br>> or, via email, send a message with subject or body 'help' to<br>> winpcap-users-request@winpcap.org<br>> <br>> You can reach the person managing the list at<br>> winpcap-users-owner@winpcap.org<br>> <br>> When replying, please edit your Subject line so it is more specific<br>> than "Re: Contents of Winpcap-users digest..."<br>> <br>> <br>> Today's Topics:<br>> <br>> 1. Re: PPP capture (Gianluca Varenni)<br>> 2. Re: PPP capture (Anton Tremsin)<br>> <br>> <br>> ----------------------------------------------------------------------<br>> <br>> Message: 1<br>> Date: Mon, 14 Mar 2011 18:44:54 -0700<br>> From: Gianluca Varenni <Gianluca.Varenni@riverbed.com><br>> To: "winpcap-users@winpcap.org" <winpcap-users@winpcap.org><br>> Subject: Re: [Winpcap-users] PPP capture<br>> Message-ID:<br>> <6A8F2E88CFF83C43A6AFF7FAC775B9FC07151739AA@MAILBOXES2.nbttech.com><br>> Content-Type: text/plain; charset="us-ascii"<br>> <br>> Akif,<br>> <br>> 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<br>> <br>> <br>> - There are at least mintocopy bytes in the kernel buffer<br>> <br>> - After a certain timeout<br>> (whatever happens first).<br>> <br>> In order to reduce the delay, you will need to either reduce the timeout or the mintocopy.<br>> <br>> Have a nice day<br>> GV<br>> <br>> From: winpcap-users-bounces@winpcap.org [mailto:winpcap-users-bounces@winpcap.org] On Behalf Of Akif Usman<br>> Sent: Thursday, March 10, 2011 11:20 AM<br>> To: winpcap-users@winpcap.org<br>> Subject: [Winpcap-users] PPP capture<br>> <br>> HI,<br>> <br>> 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.<br>> <br>> Best Regards<br>> Fika<br>> -------------- next part --------------<br>> An HTML attachment was scrubbed...<br>> URL: <http://www.winpcap.org/pipermail/winpcap-users/attachments/20110314/fcd4e478/attachment-0001.html><br>> <br>> ------------------------------<br>> <br>> Message: 2<br>> Date: Mon, 14 Mar 2011 23:42:30 -0700<br>> From: Anton Tremsin <ast@ssl.berkeley.edu><br>> To: winpcap-users@winpcap.org<br>> Cc: Gianluca Varenni <Gianluca.Varenni@riverbed.com><br>> Subject: Re: [Winpcap-users] PPP capture<br>> Message-ID: <4D7F0A56.1070207@ssl.berkeley.edu><br>> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"<br>> <br>> Akif, Gianluca,<br>> <br>> As I mentioned in my previous messages, I have exactly the same problem <br>> of delayed packages, with mintocopy set even to 0 (tried other values as <br>> well). I am always sending a set of 64 packets of 8Kbytes each (that is <br>> one image data). The packets are not lost, they always arrive. However, <br>> some of them come with no delay (varied number of them, sometimes 62, <br>> sometimes 57, etc), while the rest of them come exactly after the delay <br>> equal to the setting of the timeout, which I varied between 1 and 10000 <br>> milliseconds. There is no timeout reported for the packets to arrive <br>> with the delay.<br>> <br>> I will be very glad if that issue can be solved, which has probably the <br>> same cause as in Akif's application.<br>> <br>> Thanks a lot,<br>> <br>> Anton<br>> ><br>> > Akif,<br>> ><br>> > This is probably due to the mintocopy and timeout of WinPcap. WinPcap <br>> > does not deliver you the packets immediately after they are received <br>> > by the driver. Packets are batched in kernel mode and delivered to the <br>> > receiving application when<br>> ><br>> > - There are at least mintocopy bytes in the kernel buffer<br>> ><br>> > - After a certain timeout<br>> ><br>> > (whatever happens first).<br>> ><br>> > In order to reduce the delay, you will need to either reduce the <br>> > timeout or the mintocopy.<br>> ><br>> > Have a nice day<br>> ><br>> > GV<br>> ><br>> > *From:* winpcap-users-bounces@winpcap.org <br>> > [mailto:winpcap-users-bounces@winpcap.org] *On Behalf Of *Akif Usman<br>> > *Sent:* Thursday, March 10, 2011 11:20 AM<br>> > *To:* winpcap-users@winpcap.org<br>> > *Subject:* [Winpcap-users] PPP capture<br>> ><br>> > HI,<br>> ><br>> > I have installed the winpcap version 3.1 beta and i am capturing from <br>> > a PPP interface and it captures perfectly. Now i am trying to capture <br>> > from the same PPP interface using my LIBPCAP program and forward it to <br>> > another Ethernet interface that connects further to a second computer <br>> > (Ethernet NIC) which also has wireshark running on it. When i capture <br>> > from the second computer i get a strange offset of 0.5 seconds after <br>> > every x packets. This is very strange. I dont know why wireshark is <br>> > able to capture from PPP interface on the first computer with proper <br>> > accuracy and why my LIBPCAP program, which is just forwarding the <br>> > packets, is introducing a 0.5s [:-O] delay. Please help me out as soon <br>> > as somebody can.<br>> ><br>> > Best Regards<br>> ><br>> > Fika<br>> ><br>> ><br>> > _______________________________________________<br>> > Winpcap-users mailing list<br>> > Winpcap-users@winpcap.org<br>> > https://www.winpcap.org/mailman/listinfo/winpcap-users<br>> > <br>> <br>> -------------- next part --------------<br>> An HTML attachment was scrubbed...<br>> URL: <http://www.winpcap.org/pipermail/winpcap-users/attachments/20110314/fde1d594/attachment-0001.html><br>> <br>> ------------------------------<br>> <br>> _______________________________________________<br>> Winpcap-users mailing list<br>> Winpcap-users@winpcap.org<br>> https://www.winpcap.org/mailman/listinfo/winpcap-users<br>> <br>> <br>> End of Winpcap-users Digest, Vol 72, Issue 7<br>> ********************************************<br></div> </body>
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