[Winpcap-users] does the winpcap version 4.1.2 supportthekernelDump feature?

[yulou liu]

1. Maybe I didn't make it clear .I don't just want to count , I want to save
the data to disk(ramdisk ) too .  At the rate of 614Mbps,  recording  data
lasts about 2 minutes.  But I found it began to have packets loss sometimes
,even I just count the packets number.

2. All the packets from the fpga is 1514,  I made the minitocopy as 8 kytes,
kernel buffer and user buffer both as 32MB.

3. There is still have tcp/ip bound to the netcard , it is recommended to
disable it? I will have a try.

Thank you.


在 2010-8-7，1:45，Gianluca Varenni <gianluca.varenni at cacetech.com> 写到：

I'm not 100% sure what the performance problem has to do with the live_dump
feature. At those traffic rates you definitely don't want to dump all the
packets to disk. If you are just interested in counting the packets, I would
use the statistical mode of WinPcap to just count the packets. Follow the
sample Examples-remote\tcptop for that.

Having said, at those rates there is no guarantee that WinPcap will be able
to keep up (especially if the packets are small). What is the average packet
size that you are analyzing? Did you disable all the bound protocols from
the network card used for the capture?

Have a nice day
GV



 *From:* yulou liu <lyulou at gmail.com>
*Sent:* Friday, August 06, 2010 10:14 AM
*To:* winpcap-users at winpcap.org
*Subject:* Re: [Winpcap-users] does the winpcap version 4.1.2
supportthekernelDump feature?

 yes，i don't want to use an old version either.but there has been a problem
that I can't resolve . I made a capture program to collecte datas which are
sent from an fpga  . There are several receive threads in the program, each
of threads accesses a global netcard port in tern. In order to verify the
performace ,it just do the least thing In the receive thread---it just count
the amount of  Ethernet frames that it receive. But when the fpga sending
 rate increases,especially above 500Mbps, it sometimes loss packets. My
question is, is it possible to totally avoid packets loss by optimism the
code?  I want to collect datas on the speed 614Mbps without packet loss.
My workstations features with 2 Xeon CPU (each has 4core), 1 G onboard
 netcard.

Thanks a lot!


在 2010-8-6，23:58，Gianluca Varenni <gianluca.varenni at cacetech.com> 写到：

  I would definitely avoid using an old version of WinPcap (like 3.0alpha2).
A huge number of bugs have been fixed since that release, including critical
bugs in the driver that could cause OS crashes.

Have a nice day
GV

 *From:* yulou liu <lyulou at gmail.com>
*Sent:* Thursday, August 05, 2010 7:22 PM
*To:*  <winpcap-users at winpcap.org>winpcap-users at winpcap.org
*Subject:* Re: [Winpcap-users] does the winpcap version 4.1.2 support
thekernelDump feature?



thanks a lot.

I have another question.
Is there any possible that I could use the live_dump feature if I install
the older version of winpcap ?

the following was what I just tried this morning:

1.  install the 3.0alpha2-WinPcap.exe
2.   download the  "3.0beta-wpdpack.zip"  file  and unzip  , and config VC6
to refer to the lib , include's  directions .

Compile the project  which uses  pcap_live_dump().  It was successully
compiled .
But when I run the .exe file , it can't find the  netcard interfaces.

Please  tell me what  mistakes did I make ?

Thank you.


在 2010-8-6，0:45，Gianluca Varenni < <gianluca.varenni at cacetech.com>
gianluca.varenni at cacetech.com> 写到：

  The live_dump feature has been disabled several years ago (because of
other changes in the driver) and no one has worked to support it again. At
the moment in order to dump to disk you need to use the standard
dump-to-disk mechanism shown in sample "savedump" in the WinPcap developer's
pack.

Have a nice day.

 *From:* yulou liu <lyulou at gmail.com>
*Sent:* Thursday, August 05, 2010 9:32 AM
*To:*  <winpcap-users at winpcap.org> <winpcap-users at winpcap.org>
winpcap-users at winpcap.org
*Subject:* [Winpcap-users] does the winpcap version 4.1.2 support the
kernelDump feature?

I'm working on a project , that I want to dump packets to the disk .
I think the pcap_live_dump()  maybe could work in the way I want.
but it seems the pcap_live_dump() is not supported in the new version of
winpcap.
is it true ??

thank you.

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