netdev - Re: Network performance with small packets

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Date:	Wed, 09 Mar 2011 07:42:03 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	habanero@...ux.vnet.ibm.com
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Krishna Kumar2 <krkumar2@...ibm.com>,
	David Miller <davem@...emloft.net>, kvm@...r.kernel.org,
	netdev@...r.kernel.org, steved@...ibm.com,
	Tom Lendacky <tahm@...ux.vnet.ibm.com>
Subject: Re: Network performance with small packets

On Tue, 2011-03-08 at 20:21 -0600, Andrew Theurer wrote:
> Tom L has started using Rusty's patches and found some interesting
> results, sent yesterday:
> http://marc.info/?l=kvm&m=129953710930124&w=2

Thanks. Very good experimental. I have been struggling with guest/vhost
optimization work for a while. I created different experimental patches,
performance results really depends on workloads.

Based on the discussions and findings, seems that to improve
virtio_net/vhost optimization work, we really need to collect more
statistics data on both virtio_net and vhost for both TX and RX. 

A way to filter number of guest exits, I/O exits, irq injections in
guest networking stacks only would be helpful.

Thanks
Shirley

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