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Akif, Gianluca,<br>
<br>
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.<br>
<br>
I will be very glad if that issue can be solved, which has probably the
same cause as in Akif's application.<br>
<br>
Thanks a lot,<br>
<br>
Anton<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Akif,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">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<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><span
style="">-<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
</span></span></span><!--[endif]--><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">There
are at least mintocopy bytes in the kernel buffer<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent: -0.25in;"><!--[if !supportLists]--><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><span
style="">-<span
style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal; -x-system-font: none;">
</span></span></span><!--[endif]--><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">After
a certain timeout<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">(whatever
happens first).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">In
order to reduce the delay, you will need to either reduce the timeout
or the mintocopy.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">Have
a nice day<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);">GV<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 11pt; font-family: "Calibri","sans-serif"; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<div>
<div
style="border-style: solid none none; border-color: rgb(181, 196, 223) -moz-use-text-color -moz-use-text-color; border-width: 1pt medium medium; padding: 3pt 0in 0in;">
<p class="MsoNormal"><b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">From:</span></b><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">
<a class="moz-txt-link-abbreviated" href="mailto:winpcap-users-bounces@winpcap.org">winpcap-users-bounces@winpcap.org</a>
[<a class="moz-txt-link-freetext" href="mailto:winpcap-users-bounces@winpcap.org">mailto:winpcap-users-bounces@winpcap.org</a>] <b>On Behalf Of </b>Akif
Usman<br>
<b>Sent:</b> Thursday, March 10, 2011 11:20 AM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:winpcap-users@winpcap.org">winpcap-users@winpcap.org</a><br>
<b>Subject:</b> [Winpcap-users] PPP capture<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">HI,<o:p></o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">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.<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";"><o:p> </o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">Best
Regards<o:p></o:p></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size: 10pt; font-family: "Tahoma","sans-serif";">Fika<o:p></o:p></span></p>
</div>
</div>
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