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Re: [Xen-devel] "Time went backwards" messages
| To: | Don Fry <brazilnut@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] "Time went backwards" messages |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Tue, 5 Apr 2005 13:13:57 +0100 |
| Cc: | xen-devel list <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Tue, 05 Apr 2005 12:10:41 +0000 |
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On 5 Apr 2005, at 09:28, Keir Fraser wrote: I have a high end IBM system with 4 HT CPUs, am running xen-unstable with only Dom0 active, and I get lots of "Timer ISR/n: Time went backwards" messages. This is a short segment from dmesg:The errors are coming from the per-vcpu timer interrupt that is only used in SMP guest builds. I can well imagine there are some 'latent correctness issues' around that code. :-) If you get messages starting 'Timer ISR: Time went backwards' then that would be more worrying. Okay, I've fixed up the timer code for SMP quite a bit. In particular, secondary cpus were updating shared time information with no locks held. I expect that with the current unstable repository you will no longer see the time-went-backwards messages. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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