[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] Re: [PATCH] strictly increasing hvm guest time
On 2/7/08 17:03, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote: > This simple one-line patch changes hvm guest time from > monotonically non-decreasing to monotonically strictly- > increasing. As a result, two consecutive reads of the > (virtual) hpet will never return the same value, thus > avoiding the appearance that time has stopped (which may > occur if there is skew between physical processor TSCs). It does seem a little hack-ish, if we don't know of any issues arising from the current code, and we expect cross-cpu deltas to be pretty small. Also guests will often convert HPET reads to well-known units (e.g., microseconds, milliseconds) before using them, in which case even a delta of one may not result in differing converted time values. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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