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RE: [Xen-devel] RTC going backwards?
| To: | "Rob Gardner" <rob.gardner@xxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | RE: [Xen-devel] RTC going backwards? |
| From: | "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx> |
| Date: | Tue, 5 Apr 2005 21:20:28 +0100 |
| Delivery-date: | Tue, 05 Apr 2005 20:20:25 +0000 |
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| Thread-topic: | [Xen-devel] RTC going backwards? |
> Is it possible to call NOW() in xen, and then sometime later > call it again and get a slightly smaller value (ie, by a few > thousand ns)? Is there something that makes small corrections > to the rtc once in a while? > I'm trying to track down a bug in some code I'm developing > and it looks like time really does go backwards sometimes. NOW() uses get_s_time (system time), which should always be greater or equal to the previous value. If you're running a domain 0 with xntpd, then Xen's wall clock time time (as opposed to system time) can indeed go backwards if domain 0 pushes down adjustments to it. Ian _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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