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

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Message-ID: <87r50fgzyj.fsf@rustcorp.com.au>
Date:	Thu, 08 Dec 2011 20:14:20 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Sasha Levin <levinsasha928@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, 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 Wed, 7 Dec 2011 17:48:17 +0200, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> On Wed, Dec 07, 2011 at 04:02:45PM +0200, Sasha Levin wrote:
> > On Sun, 2011-12-04 at 20:23 +0200, Sasha Levin wrote:
> > 
> > [snip]
> > 
> > Rusty, Michael, does the below looks a reasonable optimization for you?
> 
> OK overall but a bit hard to say for sure as it looks pretty incomplete ...

A static threshold is very hackish; we need to either initialize it to
a proven-good value (since noone will ever change it) or be cleverer.

Thanks,
Rusty.
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