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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.