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:* [email protected]
[mailto:[email protected]] *On Behalf Of *Akif Usman
*Sent:* Thursday, March 10, 2011 11:20 AM
*To:* [email protected]
*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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