From: Andi Kleen <ak@suse.de>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
virtualization@lists.osdl.org,
lkml <linux-kernel@vger.kernel.org>, Ingo Molnar <mingo@elte.hu>
Subject: Re: [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries
Date: Wed, 4 Apr 2007 13:47:42 +0200 [thread overview]
Message-ID: <200704041347.42822.ak@suse.de> (raw)
In-Reply-To: <46136F25.7030907@goop.org>
On Wednesday 04 April 2007 11:25:57 Jeremy Fitzhardinge wrote:
> Andi Kleen wrote:
> > What do the benchmarks say with CONFIG_PARAVIRT on native hardware
> > compared to !CONFIG_PARAVIRT. e.g. does lmbench suffer?
>
> Barely. There's a slight hit for not using patching, and patching is
> almost identical to native performance. The most noticeable difference
> is in the null syscall microbenchmark, but once you get to complex
> things the difference is in the noise.
Why is there a difference for null syscall? I had assumed we patched all the
fast path cases relevant there. Do you have an idea where it comes from?
-Andi
next prev parent reply other threads:[~2007-04-04 11:47 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-02 5:56 [patch 00/17] paravirt_ops updates Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 01/17] update MAINTAINERS Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 02/17] Remove CONFIG_DEBUG_PARAVIRT Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 03/17] use paravirt_nop to consistently mark no-op operations Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries Jeremy Fitzhardinge
2007-04-02 6:12 ` Andi Kleen
2007-04-02 6:35 ` Rusty Russell
2007-04-02 6:48 ` Jeremy Fitzhardinge
2007-04-04 9:25 ` Jeremy Fitzhardinge
2007-04-04 11:47 ` Andi Kleen [this message]
2007-04-04 15:45 ` Jeremy Fitzhardinge
2007-04-04 15:56 ` Andi Kleen
2007-04-04 16:04 ` Jeremy Fitzhardinge
2007-04-04 22:59 ` Rusty Russell
2007-04-04 23:39 ` Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 05/17] Hooks to set up initial pagetable Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 06/17] Allocate a fixmap slot Jeremy Fitzhardinge
2007-04-02 5:56 ` [patch 07/17] Allow paravirt backend to choose kernel PMD sharing Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 08/17] add hooks to intercept mm creation and destruction Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 09/17] rename struct paravirt_patch to paravirt_patch_site for clarity Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 10/17] Use patch site IDs computed from offset in paravirt_ops structure Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 11/17] Fix patch site clobbers to include return register Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 12/17] Consistently wrap paravirt ops callsites to make them patchable Jeremy Fitzhardinge
2007-04-02 7:11 ` Andi Kleen
2007-04-02 7:20 ` Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 13/17] add common patching machinery Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 14/17] add flush_tlb_others paravirt_op Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 15/17] revert map_pt_hook Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 16/17] add kmap_atomic_pte for mapping highpte pages Jeremy Fitzhardinge
2007-04-02 7:18 ` Andi Kleen
2007-04-02 7:22 ` Jeremy Fitzhardinge
2007-04-02 5:57 ` [patch 17/17] Add a sched_clock paravirt_op Jeremy Fitzhardinge
2007-04-02 6:09 ` Andi Kleen
2007-04-02 6:47 ` Jeremy Fitzhardinge
2007-04-02 6:50 ` Andi Kleen
2007-04-02 7:06 ` Jeremy Fitzhardinge
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