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From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Andi Kleen <ak@suse.de>
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, 04 Apr 2007 02:25:57 -0700	[thread overview]
Message-ID: <46136F25.7030907@goop.org> (raw)
In-Reply-To: <200704020812.18320.ak@suse.de>

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.

Processor, Processes - times in microseconds - smaller is better
------------------------------------------------------------------------------
Host                 OS  Mhz null null      open slct sig  sig  fork exec sh  
                             call  I/O stat clos TCP  inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ----
non-paravirt
ezr       Linux 2.6.21- 1000 0.25 0.52 31.6 34.7 10.3 1.03 5.31 726. 1565 4520
ezr       Linux 2.6.21- 1000 0.25 0.52 31.8 34.7 12.6 1.03 5.41 725. 1564 4585
ezr       Linux 2.6.21- 1000 0.25 0.55 31.7 34.5 11.8 1.02 5.47 720. 1595 4518

paravirt, no patching
ezr       Linux 2.6.21- 1000 0.28 0.55 31.3 34.3 10.0 1.05 5.56 747. 1621 4675
ezr       Linux 2.6.21- 1000 0.28 0.56 31.5 34.3 12.9 1.05 5.66 755. 1629 4684
ezr       Linux 2.6.21- 1000 0.28 0.55 31.8 34.5 12.5 1.05 5.45 747. 1622 4695

paravirt, patching
ezr       Linux 2.6.21- 1000 0.25 0.53 31.8 34.4 10.1 1.04 5.44 730. 1583 4600
ezr       Linux 2.6.21- 1000 0.26 0.55 32.1 35.2 13.3 1.03 5.48 748. 1589 4606
ezr       Linux 2.6.21- 1000 0.26 0.54 32.0 34.9 14.1 1.04 5.43 752. 1606 4647


    J

  parent reply	other threads:[~2007-04-04  9:26 UTC|newest]

Thread overview: 62+ 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 ` 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   ` Jeremy Fitzhardinge
2007-04-02  5:56 ` [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries Jeremy Fitzhardinge
2007-04-02  5:56   ` Jeremy Fitzhardinge
2007-04-02  6:12   ` Andi Kleen
2007-04-02  6:35     ` Rusty Russell
2007-04-02  6:48     ` Jeremy Fitzhardinge
2007-04-02  6:48       ` Jeremy Fitzhardinge
2007-04-04  9:25     ` Jeremy Fitzhardinge [this message]
2007-04-04  9:57       ` Ingo Molnar
2007-04-04 11:49         ` Andi Kleen
2007-04-04 15:43         ` Jeremy Fitzhardinge
2007-04-04 15:46           ` Ingo Molnar
2007-04-04 16:10             ` Jeremy Fitzhardinge
2007-04-04 11:47       ` Andi Kleen
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 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   ` Jeremy Fitzhardinge
2007-04-02  5:56 ` [patch 06/17] Allocate a fixmap slot Jeremy Fitzhardinge
2007-04-02  5:56   ` Jeremy Fitzhardinge
2007-04-02  5:56 ` [patch 07/17] Allow paravirt backend to choose kernel PMD sharing Jeremy Fitzhardinge
2007-04-02  5:56   ` 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   ` 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   ` 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   ` 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   ` 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  7:11     ` 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   ` Jeremy Fitzhardinge
2007-04-02  5:57 ` [patch 14/17] add flush_tlb_others paravirt_op Jeremy Fitzhardinge
2007-04-02  5:57   ` Jeremy Fitzhardinge
2007-04-02  5:57 ` [patch 15/17] revert map_pt_hook Jeremy Fitzhardinge
2007-04-02  5:57   ` 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  7:18     ` Andi Kleen
2007-04-02  7:22     ` Jeremy Fitzhardinge
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  5:57   ` Jeremy Fitzhardinge
2007-04-02  6:09   ` Andi Kleen
2007-04-02  6:09     ` Andi Kleen
2007-04-02  6:47     ` Jeremy Fitzhardinge
2007-04-02  6:50       ` Andi Kleen
2007-04-02  6:50         ` Andi Kleen
2007-04-02  7:06         ` Jeremy Fitzhardinge

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