netdev - Re: Network performance with small packets

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Date:	Wed, 09 Mar 2011 08:51:33 -0800
From:	Shirley Ma <mashirle@...ibm.com>
To:	Tom Lendacky <tahm@...ux.vnet.ibm.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>,
	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
Subject: Re: Network performance with small packets - continued

On Wed, 2011-03-09 at 10:09 -0600, Tom Lendacky wrote:
> > > Vhost is receiving a lot of notifications for packets that are to
> be
> > > transmitted (over 60% of the packets generate a kick_notify). 

This is guest TX send notification when vhost enables notification.

In TCP_STREAM test, vhost exits from reaching NAPI WEIGHT, it rarely
enables the notification, vhost re-enters handle_tx from NAPI poll, so
guest doesn't do much kick_notify.

In multiple TCP_RR test, seems vhost exits from nothing to send in TX vq
very often, so it enables notification most of the time.

Shirley

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