[Beowulf] split traffic to two interfaces for two "subnets"
strombrg at dcs.nac.uci.edu
Thu May 11 14:53:42 PDT 2006
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
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
> (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
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