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

[yulou liu]

Hi!

I have a question,  pcap_next_ex() can only get one ethernet packet at a
call.  Is there other way that I can read more than  one packet from the
user buffer (or kernel buffer)  at one call ? I think maybe that would
decrease the packet loss.

Thank you.




2010/8/7 yulou liu <lyulou at gmail.com>

>  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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