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List:       kvm
Subject:    Virtio network performance problem
From:       "Adrian Schmitz" <aschmitz () lehighgas ! com>
Date:       2008-12-03 19:11:45
Message-ID: 3D753CDC7D3A054CADC4DC2DF4C9F66502027873 () LGC-MX01 ! corp ! lehighgas ! local
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I'm having a problem with virtio networking. I mentioned this in a
previous thread, but I'm starting a new one since Dor solved the problem
I reported in the original thread. This appears to be a new problem.

Iperf shows throughput of ~120 Mb/s between a Windows Server 2003 x64
guest and the br0 interface on the host. Also, a ping between the same
two interfaces looks pretty bad:

Pinging 10.10.10.128 with 32 bytes of data:
Reply from 10.10.10.128: bytes=32 time=-389ms TTL=64
Reply from 10.10.10.128: bytes=32 time<1ms TTL=64
Reply from 10.10.10.128: bytes=32 time=392ms TTL=64
Reply from 10.10.10.128: bytes=32 time=392ms TTL=64
Reply from 10.10.10.128: bytes=32 time=377ms TTL=64
Reply from 10.10.10.128: bytes=32 time=392ms TTL=64
Reply from 10.10.10.128: bytes=32 time<1ms TTL=64
Reply from 10.10.10.128: bytes=32 time=401ms TTL=64
Reply from 10.10.10.128: bytes=32 time=1ms TTL=64

Using e1000 driver on this guest, iperf shows 320+ Mb/s throughput, and
latency looks like it should.

Host kernel:			2.6.18
KVM Version:			79 (modules and tools built and
installed from source)
Guest OS:   			Win2k3 x64 with all service packs and
patches
Guest virtio drivers:		Version 3 (received from Dor Laor
yesterday.. these fixed the guest OS crashes I was having with version
2)

Any suggestions are greatly appreciated. If there's additional info I
can provide, please let me know.
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