Thanks Al. I will test one pfring_recv thread with 4 memcpy threads.
> On Jun 11, 2015, at 11:55 PM, Alfredo Cardigliano <[email protected]> > wrote: > > Hi > you are experiencing performance drop with smaller packets because you have > more packets per second, thus more memcpy() call’s and more per-packet > overhead, let’s say it is expected for this application, you should try to > redesign it (using multiple threads for instance). > > Alfredo > >> On 11 Jun 2015, at 17:24, [email protected] wrote: >> >> ok.I cross connect to 10GE port and use "pfsend -i dna0 -g 8 -l 64" to send >> packets on dna0, while use "silidump -i dna1 -g 15 -w /mnt/disk1/" to >> capture packets and save to disk. silidump written by my self reference from >> pfdump demo code. pfsend send packets at speed of nearly 13Mpps so i am sure >> of the pf_ring.ko and ixgbe.ko(DNA) was loaded corectly.silidump create on >> thread dedicated capture pakcet by calling pfring_recv(pd, &buff, 0, &hdr, >> 1) within a dead loop, and copy buff to another 2GB memaligned buffer while >> receive one packet. in this manner pfring_stats shows packet drop. >> key code like this: >> for(;;){ >> if(pfring_recv(&pd, &buff, 0, &hdr, 1)>0){ >> memcpy(buff, hdr.len, alignedbuffer); >> ++pkt_cnt; >> } >> } >> without memcpy pfring_stats shows no packet drop. >> my server os is ubuntu 12.04 64bit version running on 2 xeon E2470 @2.3GHz >> each has 8 core. >> give any clue if you can. thanks and best regards :-) >>> Hi, please explain in detail the tests you have made with complete command >>> line options Luca > On 05 Jun 2015, at 02:02, tiankun zhang >>> <zhangtiankun1988 at gmail.com> wrote: > > appreciate your reply luca. one >>> more question, i want to do packet > capture at line rate using >>> PF_RING+DNA, i tested my program with 512 byte packet at 10Gbps , there's >>> no packet drop. BUT with 256, 128,64 byte packet drop increased >>> dramatically. actually, i use memcpy to copy packet to user space buffer. >>> may this be the problem at high pps ? any idea for fixing it? looking >>> forward reply thx 😊 > > tiankun zhang <zhangtiankun1988 at gmail.com >>> <mailto:zhangtiankun1988 at gmail.com>>于2015年6月4日星期四写道： > > >>> _______________________________________________ > Ntop-misc mailing list > >>> Ntop-misc at listgateway.unipi.it > >>> http://listgateway.unipi.it/mailman/listinfo/ntop-misc -------------- next >>> part -------------- An HTML attachment was scrubbed... URL: >>> <http://listgateway.unipi.it/mailman/private/ntop-misc/attachments/20150608/640865e0/attachment.htm> >> _______________________________________________ >> Ntop-misc mailing list >> [email protected] >> http://listgateway.unipi.it/mailman/listinfo/ntop-misc > > _______________________________________________ > Ntop-misc mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop-misc
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