If you have an application that's sending data into the IP stack in chunks < 9000, then the 9000 MTU may not help that much, barring something like Nagle.
However, if you crank up your NFS wsize and/or rsize, you may see a nice boost. NFS isn't known as a stellar performer in terms of network performance. On Thu, 2006-05-11 at 17:12 -0400, Yaroslav Halchenko wrote: > Just thought that it might be interesting for someone > > ok -- I setup bonding ;-) and it works ;) > with my tuned net/ip params: > > net.core.wmem_max = 524288 > net.core.rmem_max = 524288 > net.ipv4.tcp_rmem = 4096 524288 524288 > net.ipv4.tcp_wmem = 4096 65536 524288 > > and with mtu 9000 on both ends, running two netperfs (netperf params > are -P 0 -c -C -n 2 -f K -l 20 ) to two nodes give me next > results: > > (in KBytes/sec... why didn't I make it in megabits? :)) > node1 node2 total > average 64276.88 82695.07 146971.95 > std 20555.99 20215.57 10685.59 > min 29857.41 39972.52 129420.64 > max 110149.35 112383.19 166813.32 > > that is simplex -- ie just netperf to the nodes... > so, the results are not that great in comparison to 2 split interfaces > where each one can achieve up to max you observed in the table > > may be I should have tried different MTUs... at least for duplex traffic > MTU around 3500 provide better performance... > > since I am aiming at NFS I would also better check bonding performance > on NFS tests... > > after all it is a cheap router ;-) > > On Thu, 11 May 2006, Yaroslav Halchenko wrote: > > > Great great great news for me ;-) > > > Thank you Joshua -- I will try to set things up and use trunking > _______________________________________________ > Beowulf mailing list, [email protected] > To change your subscription (digest mode or unsubscribe) visit > http://www.beowulf.org/mailman/listinfo/beowulf _______________________________________________ Beowulf mailing list, [email protected] To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
