netdev - Re: Network performance with small packets

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Date:	Wed, 09 Mar 2011 08:38:02 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	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 - continued

On Wed, 2011-03-09 at 18:32 +0200, Michael S. Tsirkin wrote:
> I think your issues are with TX overrun.
> Besides delaying IRQ on TX, I don't have many ideas.
> 
> The one interesting thing is that you see better speed
> if you drop packets. netdev crowd says this should not happen,
> so could be an indicator of a problem somewhere.

Yes, I am looking at why guest didn't see see used_buffers on time from
vhost send TX completion I am trying to collect some data on vhost.

I also wonder whether it's a scheduler issue.

Thanks
Shirley

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