linux-kernel - Re: [PATCH] virtio-ring: Use threshold for switching to indirect descriptors

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Message-ID: <4EDBAFC5.2010405@redhat.com>
Date:	Sun, 04 Dec 2011 19:37:09 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Sasha Levin <levinsasha928@...il.com>
CC:	"Michael S. Tsirkin" <mst@...hat.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
	markmc@...hat.com
Subject: Re: [PATCH] virtio-ring: Use threshold for switching to indirect
 descriptors

On 12/04/2011 07:34 PM, Sasha Levin wrote:
> > 
> > I'm confused. didn't you see a bigger benefit for guest->host by
> > switching indirect off?
>
> The 5% improvement is over the 'regular' indirect on, not over indirect
> off. Sorry for the confusion there.
>
> I suggested this change regardless of the outcome of indirect descriptor
> threshold discussion, since it would help anyways.

For net, this makes sense.  For block, it reduces the effective queue
depth, so it's not a trivial change.  It probably makes sense there too,
though.

-- 
error compiling committee.c: too many arguments to function

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