What makes you think your machine can keep up with 614Mbps? Just because you have a gig interface does NOT mean you can do gig speeds. You can use this utility to test your speed between machines. http://www.netcordia.com/community/files/folders/tools/entry103.aspx And are you on any kind of switch between them? That's another limit. Michael D. Black Senior Scientist Advanced Analytics Directorate Northrop Grumman Information Systems
________________________________ From: [email protected] on behalf of yulou liu Sent: Wed 8/11/2010 11:17 AM To: [email protected] Subject: EXTERNAL:Re: [Winpcap-users] does the winpcap version 4.1.2 supportthekernelDump feature? 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 <[email protected]> 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. ? 2010-8-7,1:45,Gianluca Varenni <[email protected]> ??: 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 <mailto:[email protected]> Sent: Friday, August 06, 2010 10:14 AM To: <mailto:[email protected]> [email protected] 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! ? 2010-8-6,23:58,Gianluca Varenni < <mailto:[email protected]> [email protected]> ??: 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 <mailto:[email protected]> Sent: Thursday, August 05, 2010 7:22 PM To: <mailto:[email protected]> <mailto:[email protected]> [email protected] 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. ? 2010-8-6,0:45,Gianluca Varenni < <mailto:[email protected]> <mailto:[email protected]> [email protected]> ??: 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 <mailto:[email protected]> Sent: Thursday, August 05, 2010 9:32 AM To: <mailto:[email protected]> <mailto:[email protected]> <mailto:[email protected]> [email protected] 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. ________________________________ _______________________________________________ Winpcap-users mailing list <mailto:[email protected]> <mailto:[email protected]> <mailto:[email protected]> [email protected] <https://www.winpcap.org/mailman/listinfo/winpcap-users> <https://www.winpcap.org/mailman/listinfo/winpcap-users> <https://www.winpcap.org/mailman/listinfo/winpcap-users> https://www.winpcap.org/mailman/listinfo/winpcap-users _______________________________________________ Winpcap-users mailing list <mailto:[email protected]> <mailto:[email protected]> [email protected] <https://www.winpcap.org/mailman/listinfo/winpcap-users> <https://www.winpcap.org/mailman/listinfo/winpcap-users> https://www.winpcap.org/mailman/listinfo/winpcap-users ________________________________ _______________________________________________ Winpcap-users mailing list <mailto:[email protected]> [email protected] <https://www.winpcap.org/mailman/listinfo/winpcap-users> https://www.winpcap.org/mailman/listinfo/winpcap-users _______________________________________________ Winpcap-users mailing list <mailto:[email protected]> [email protected] <https://www.winpcap.org/mailman/listinfo/winpcap-users> https://www.winpcap.org/mailman/listinfo/winpcap-users ________________________________ _______________________________________________ Winpcap-users mailing list [email protected] https://www.winpcap.org/mailman/listinfo/winpcap-users _______________________________________________ Winpcap-users mailing list [email protected] https://www.winpcap.org/mailman/listinfo/winpcap-users
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