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

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Message-ID: <87obvifgx5.fsf@rustcorp.com.au>
Date:	Fri, 09 Dec 2011 16:03:10 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	"Michael S. Tsirkin" <mst@...hat.com>, 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 Thu, 08 Dec 2011 12:37:48 +0200, Sasha Levin <levinsasha928@...il.com> wrote:
> On Thu, 2011-12-08 at 20:14 +1030, Rusty Russell wrote:
> > 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.
> 
> I'll better wait to see how the threshold issue is resolved, and
> possibly do it as a dynamic value which depends on the threshold.
> 
> I doubt theres one magic value which would work for all.

Sure, but if it's generally better than the current value, I'll apply it.

Cheers,
Rusty.
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