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From: | Anthony Liguori |
Subject: | Re: [Qemu-devel] [RFC] Disk integrity in QEMU |
Date: | Tue, 14 Oct 2008 10:32:35 -0500 |
User-agent: | Thunderbird 2.0.0.17 (X11/20080925) |
Avi Kivity wrote:
I don't think O_DIRECT should be qemu's default, since anyone using qemu directly is likely a "causal virtualization" user. Management systems like ovirt should definitely default to O_DIRECT (really, they shouldn't even offer caching).
ovirt isn't a good example because the default storage model is iSCSI. Since you aren't preserving zero-copy, I doubt that you'll see any advantage to using O_DIRECT (I suspect the code paths aren't even different).
Regards, Anthony Liguori
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