[Beowulf] split traffic to two interfaces for two "subnets"

[Yaroslav Halchenko]

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
-- 
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Yaroslav Halchenko              /(   )\               ICQ#: 60653192
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