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[Xen-devel] Re: [PATCH] CPUIDLE: revise tsc-save/restore to avoid big ts
| To: | "Wei, Gang" <gang.wei@xxxxxxxxx> |
|---|---|
| Subject: | [Xen-devel] Re: [PATCH] CPUIDLE: revise tsc-save/restore to avoid big tsc skew between cpus |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Fri, 05 Dec 2008 14:47:41 +0000 |
| Cc: | "Tian, Kevin" <kevin.tian@xxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 05 Dec 2008 06:48:04 -0800 |
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| In-reply-to: | <C55ED7B9.9C5%keir.fraser@xxxxxxxxxxxxx> |
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| Thread-topic: | [PATCH] CPUIDLE: revise tsc-save/restore to avoid big tsc skew between cpus |
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On 05/12/2008 13:06, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote: >> Below patch should be what you expected. It will still bring continuously >> increasing tsc skew. If I pin all domains' vcpus on 1 pcpu, the skew is >> increasing faster. > > I applied a modified version of this as c/s 18873. Primarily I removed > scale_time() and replaced with a simpler reciprocal function which is applied > to scale factors to invert them. Please take a look. I should have tested the reciprocal function before checkin. A fixed (and now rather less simple) version is in c/s 18875. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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