netdev - Re: [PATCHv2] vhost-net: utilize PUBLISH_USED

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Message-ID: <4BF2D2A7.8030803@redhat.com>
Date:	Tue, 18 May 2010 20:47:19 +0300
From:	Avi Kivity <avi@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	davem@...emloft.net, Juan Quintela <quintela@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Arnd Bergmann <arnd@...db.de>, kvm@...r.kernel.org,
	virtualization@...ts.osdl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, alex.williamson@...hat.com,
	amit.shah@...hat.com
Subject: Re: [PATCHv2] vhost-net: utilize PUBLISH_USED_IDX feature

On 05/18/2010 05:21 AM, Michael S. Tsirkin wrote:
> With PUBLISH_USED_IDX, guest tells us which used entries
> it has consumed. This can be used to reduce the number
> of interrupts: after we write a used entry, if the guest has not yet
> consumed the previous entry, or if the guest has already consumed the
> new entry, we do not need to interrupt.
> This imporves bandwidth by 30% under some workflows.
>    

Seems to be missing the cacheline alignment.

Rusty's clarification did not satisfy me, I think it's needed.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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