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Re: [Xen-devel] [PATCH] x86 hvm: freeze PIT/LAPIC timer emulation while
| To: | Kouya Shimura <kouya@xxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86 hvm: freeze PIT/LAPIC timer emulation while its IRQ is masked |
| From: | Keir Fraser <keir.fraser@xxxxxxxxxxxxx> |
| Date: | Wed, 16 Sep 2009 08:40:59 +0100 |
| Cc: | "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Wed, 16 Sep 2009 00:42:43 -0700 |
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| Thread-index: | Aco2mX+LvMY35Q5tTZOesSEp0iRhJQAB4i97 |
| Thread-topic: | [Xen-devel] [PATCH] x86 hvm: freeze PIT/LAPIC timer emulation while its IRQ is masked |
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On 16/09/2009 07:46, "Kouya Shimura" <kouya@xxxxxxxxxxxxxx> wrote: > I remade the patch and measured the performance win. Attached is > a benchmark program which I wrote. It is complied by cygwin's gcc > by -O2 and runs on Windows XP(32bit). And my cpu is > Intel Core2 Quad Q9450@xxxxxxxx > > The result is that my patch saves 32 cycles(TSC) per one VM_EXIT(cpuid). > (2696 tsc => 2664 tsc) > > The patch is split to two. I'll post them in another mail. That's really not enough of a win to bother with, is it. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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