netdev - Re: performance regression in virtio-net in 2.6.32-rc4

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Message-Id: <200910281004.46800.rusty@rustcorp.com.au>
Date:	Wed, 28 Oct 2009 10:04:46 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: performance regression in virtio-net in 2.6.32-rc4

On Tue, 27 Oct 2009 05:18:35 am Michael S. Tsirkin wrote:
> 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:
...
> Size   Size    Size     Time     Throughput
> bytes  bytes   bytes    secs.    10^6bits/sec
> 
>  87380  16384  16384    10.20    7806.48
...
>  87380  16384  16384    10.00    6814.60

Hmm, needs a bisect I'd say.

Thanks,
Rusty.
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