From: Avi Kivity <avi-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Alexander Graf <agraf-l3A5Bk7waGM@public.gmane.org>
Cc: kvm-ppc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
KVM list <kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linuxppc-dev
<linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
Subject: Re: [PATCH 0/2] Faster MMU lookups for Book3s v3
Date: Thu, 01 Jul 2010 10:29:04 +0300 [thread overview]
Message-ID: <4C2C43C0.4000400@redhat.com> (raw)
In-Reply-To: <1277903926-12786-1-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org>
On 06/30/2010 04:18 PM, Alexander Graf wrote:
> Book3s suffered from my really bad shadow MMU implementation so far. So
> I finally got around to implement a combined hash and list mechanism that
> allows for much faster lookup of mapped pages.
>
> To show that it really is faster, I tried to run simple process spawning
> code inside the guest with and without these patches:
>
> [without]
>
> debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello> /dev/null; done
>
> real 0m20.235s
> user 0m10.418s
> sys 0m9.766s
>
> [with]
>
> debian-powerpc:~# time for i in {1..1000}; do /bin/echo hello> /dev/null; done
>
> real 0m14.659s
> user 0m8.967s
> sys 0m5.688s
>
> So as you can see, performance improved significantly.
>
> v2 -> v3:
>
> - use hlist
> - use global slab cache
>
>
Looks good.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2010-07-01 7:29 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-30 13:18 [PATCH 0/2] Faster MMU lookups for Book3s v3 Alexander Graf
[not found] ` <1277903926-12786-1-git-send-email-agraf-l3A5Bk7waGM@public.gmane.org>
2010-06-30 13:18 ` [PATCH 1/2] KVM: PPC: Add generic hpte management functions Alexander Graf
2010-06-30 13:18 ` [PATCH 2/2] KVM: PPC: Make use of hash based Shadow MMU Alexander Graf
2010-07-01 7:29 ` Avi Kivity [this message]
[not found] ` <4C2C43C0.4000400-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-07-01 8:18 ` [PATCH 0/2] Faster MMU lookups for Book3s v3 Alexander Graf
[not found] ` <7F9C2F52-3E95-4A22-B973-DACEBC95E5F4-l3A5Bk7waGM@public.gmane.org>
2010-07-01 8:40 ` Avi Kivity
2010-07-01 10:00 ` Alexander Graf
2010-07-01 11:14 ` Avi Kivity
2010-07-01 12:28 ` Alexander Graf
[not found] ` <4C2C89D6.3090401-l3A5Bk7waGM@public.gmane.org>
2010-07-01 12:43 ` Avi Kivity
[not found] ` <4C2C8D8A.7080103-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2010-07-01 12:52 ` Alexander Graf
[not found] ` <4C2C8FA8.1030702-l3A5Bk7waGM@public.gmane.org>
2010-07-01 13:42 ` Avi Kivity
2010-07-02 2:54 ` Benjamin Herrenschmidt
2010-07-02 2:50 ` Benjamin Herrenschmidt
2010-07-01 15:40 ` Marcelo Tosatti
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