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[Qemu-devel] Re: [PATCHv2-RFC 0/2] virtio: put last seen used index into


From: Rusty Russell
Subject: [Qemu-devel] Re: [PATCHv2-RFC 0/2] virtio: put last seen used index into ring itself
Date: Mon, 31 May 2010 17:16:42 +0930
User-agent: KMail/1.13.2 (Linux/2.6.32-21-generic; KDE/4.4.2; i686; ; )

On Thu, 27 May 2010 05:20:35 am Michael S. Tsirkin wrote:
> Here's a rewrite of the original patch with a new layout.
> I haven't tested it yet so no idea how this performs, but
> I think this addresses the cache bounce issue raised by Avi.
> Posting for early flames/comments.

Sorry, not without some evidence that it'll actually reduce cacheline
bouncing.  I *think* it will, but it's not obvious: the host may keep
looking at avail_idx as we're updating last_seen.  Or does qemu always
look at both together anyway?

Can someone convince me this is a win?
Rusty.



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