On 08/16/2010 09:00 AM, Michael Tokarev wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=16165 When a (raw) guest image is placed on an ext4 filesystem, it is possible to get data corruption, now due to ext4 bug, not kvm bug.
Yeah, there appears to be a few O_DIRECT related issues with ext4. AFAIK, a preallocated raw image should be safe though which is probably the only time you should use O_DIRECT.
Also, ext4 is _very_ slow on O_SYNC writes (which is used in kvm with default cache).
Yeah, we probably need to switch to sync_file_range() to avoid the journal commit on every write.
Regards, Anthony Liguori
JFYI. /mjt -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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