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1000bits
2005 Mar 20
4
I/O descriptor ring size bottleneck?
...lowing sysctl values:
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 65536 4194304
net.core.rmem_max = 8388608
net.core.wmem_max = 8388608
net.ipv4.tcp_bic = 0
(tcp westwood and vegas are also turned off for now)
Now if I run 50 netperf flows lasting 80 seconds (1000RTTs) from
inside a VM on one box talking to the netserver on the VM on the
other box, I get a per flow throughput of around ~2.5Mbps (which
sucks, but lets ignore the absolute value for the moment).
If I run the same test, but this time from inside dom0, I get a per
flow throughput of around 6Mbps....