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Re: [Qemu-devel] Default cache mode
From: |
Christoph Hellwig |
Subject: |
Re: [Qemu-devel] Default cache mode |
Date: |
Wed, 29 Jun 2011 16:52:48 +0200 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
On Wed, Jun 29, 2011 at 09:20:03AM -0500, Anthony Liguori wrote:
> Sorry, I meant having a new cache option (maybe diskcache). Semantics
> would be:
>
> diskcache=on,wce=on 0
> diskcache=on,wce=off O_SYNC
> diskcache=off,wce=on O_DIRECT
> diskcache=off,wce=off O_DIRECT | O_SYNC
>
> ignore_flush could be another option too.
Please make it two options instead of a two-dimensional one.
E.g. e hostcache=[on,off] option for the drive command line,
where fake is the equivalent of the current code together with
> I think developers usually want diskcache=on but I also agree that usually
> in production, you want diskcache=off.
Why would you want to not use O_DIRECT as a developer? Especially for
desktop setups where the VM images might be on a common use filesystem
not using O_DIRECT a deathly option for performance.
- Re: [Qemu-devel] Default cache mode, (continued)
- Re: [Qemu-devel] Default cache mode, Christoph Hellwig, 2011/06/29
- Re: [Qemu-devel] Default cache mode, Stefan Hajnoczi, 2011/06/29
- Re: [Qemu-devel] Default cache mode, Frediano Ziglio, 2011/06/29
- Re: [Qemu-devel] Default cache mode, Kevin Wolf, 2011/06/29
- Re: [Qemu-devel] Default cache mode, Christoph Hellwig, 2011/06/29
- Re: [Qemu-devel] Default cache mode, Kevin Wolf, 2011/06/29
Re: [Qemu-devel] Default cache mode, Christoph Hellwig, 2011/06/29
Re: [Qemu-devel] Default cache mode, Anthony Liguori, 2011/06/29
Re: [Qemu-devel] Default cache mode, Alexander Graf, 2011/06/29
Re: [Qemu-devel] Default cache mode, Stefan Hajnoczi, 2011/06/29
Re: [Qemu-devel] Default cache mode, Avi Kivity, 2011/06/29