> Von: Or Gerlitz [[email protected]] > Gesendet: Dienstag, 29. Oktober 2013 16:55 > An: Markus Stockhausen; Erez Shitrit > Cc: [email protected]; Yishai Hadas; [email protected]; Saeed > Mahameed > Betreff: Re: AW: AW: ACK behaviour difference LRO/GRO > > On 29/10/2013 17:54, Markus Stockhausen wrote: > > Should I exepect GRO to work on Mellanox IB cards with Linux 3.12 in > > general? > > YES
I'm so sorry to tell you that a jump on the 3.12 rc6 bandwagon did not gave a better picture. To sum up the most recent situation: - NFS server based on a 3.5 kernel - Server has an "older" Xeon L5420 - NFS client based on a 3.12 rc6 kernel - NFS version 3/4 does not matter - Client has a newer Core i7 - Both ends use datagram mode with 2K MTU - Client reads data from NFS (RAM) with dd into null device - tcpdump is running on the server side. >From the dump I can see most of the time about 20 incoming ack packets for one sent out data packet of size 64k. Statistics from /proc/interrupts on the server side give a result that fits the picture. ~870000 interrupts for 4GB transferred data. That is round about one interrupt per 4,5K. Not very scientific but at least an idea of what is going on. With the mac address explanation of Erez in mind I would confirm that there is still room to improve GRO even in newest kernels. Markus
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