On Tue, Aug 17, 2010 at 05:59:07PM +0300, Avi Kivity wrote: > I agree, but there's another case: tell the guest that we have a > write cache, use O_DSYNC, but only flush the disk cache on guest > flushes.
O_DSYNC flushes the disk write cache and any filesystem that supports non-volatile cache. The disk cache is not an abstraction exposed to applications. > I believe this can be approximated by mounting the host filesystem > with barrier=0? Mounting the host filesystem with nobarrier means we will never explicit flush the volatile write cache on the disk. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
