Hi!
I noticed a performance regression in virtio net: going from
2.6.31 to 2.6.32-rc4 I see this, for guest to host communication:
[...@tuck ~]$ ssh robin sh streamtest1
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.0.0.3
(11.0.0.3) port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.20 7806.48
[...@tuck ~]$ ssh robin sh streamtest1
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 11.0.0.3
(11.0.0.3) port 0 AF_INET : demo
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.00 6814.60
Note: I had to revert 48925e372f04f5e35fec6269127c62b2c71ab794,
and I applied a patch
virtio-pci: fix per-vq MSI-X request logic
which fixes a bug introduced by f68d24082e22ccee3077d11aeb6dc5354f0ca7f1.
Any tips on debugging this?
--
MST
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