From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Cc: kvm-devel <kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
Subject: Re: [PATCH] Lazy FPU for SVM
Date: Tue, 24 Apr 2007 13:39:14 +0300 [thread overview]
Message-ID: <462DDE52.5040303@qumranet.com> (raw)
In-Reply-To: <462CC380.5020405-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
Anthony Liguori wrote:
[updated patch]
Applied.
>
> Hard to say exactly because of the noise. I did two runs of 4
> test/vmexit:
>
> Before 4091, 4194, 4559, 4439
> After: 3979, 4324, 3918, 3910
>
> So there's definitely a speedup, but probably only 100-200 cycles.
>
Running on an idle, headless server with the vcpu pinned reduces
variability to a few cycles in the after case. Strangely, the
variability is high in the before case. I get a similar disappointing
result of 100-200 cycles.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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next prev parent reply other threads:[~2007-04-24 10:39 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-23 2:56 [PATCH] Lazy FPU for SVM Anthony Liguori
[not found] ` <462C2048.4040700-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
2007-04-23 6:50 ` Avi Kivity
[not found] ` <462C574E.2030304-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-04-23 14:32 ` Anthony Liguori
[not found] ` <462CC380.5020405-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-04-24 10:39 ` Avi Kivity [this message]
[not found] ` <462DDE52.5040303-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-04-24 13:59 ` Anthony Liguori
[not found] ` <462E0D52.5000707-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>
2007-04-24 14:32 ` Avi Kivity
2007-04-25 8:03 ` [PATCH] Remove redundant MSR save/restore Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A01599D74-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-04-25 8:17 ` Avi Kivity
[not found] ` <462F0E90.8010307-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-04-25 8:53 ` Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A01599E01-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-04-25 9:28 ` Avi Kivity
2007-04-25 7:30 ` [PATCH] Remove heavy is_empty_shadow_page call Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A01599D2B-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-04-25 8:03 ` Avi Kivity
[not found] ` <462F0B40.9060109-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-04-25 8:09 ` Dong, Eddie
[not found] ` <10EA09EFD8728347A513008B6B0DA77A01599D87-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2007-04-25 8:20 ` Avi Kivity
2007-04-25 8:40 ` Michael Riepe
[not found] ` <462F13E0.80104-0QoEqw4nQxo@public.gmane.org>
2007-04-25 8:45 ` Dong, Eddie
2007-04-25 8:49 ` Avi Kivity
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