[Winpcap-users] PPP capture

[Anton Tremsin]

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] *On Behalf Of *Akif Usman
> *Sent:* Thursday, March 10, 2011 11:20 AM
> *To:* 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
>
>
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