From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Anton Blanchard <anton@samba.org>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [patch 3/3] powerpc: Preload application text segment instead of TASK_UNMAPPED_BASE
Date: Tue, 14 Jul 2009 17:10:23 +1000 [thread overview]
Message-ID: <1247555423.29462.90.camel@pasglop> (raw)
In-Reply-To: <20090714065425.555222245@samba.org>
On Tue, 2009-07-14 at 16:53 +1000, Anton Blanchard wrote:
> plain text document attachment (preload_0x10000000)
> TASK_UNMAPPED_BASE is not used with the new top down mmap layout. We can
> reuse this preload slot by loading in the segment at 0x10000000, where almost
> all PowerPC binaries are linked at.
>
> On a microbenchmark that bounces a token between two 64bit processes over pipes
> and calls gettimeofday each iteration (to access the VDSO), both the 32bit and
> 64bit context switch rate improves (tested on a 4GHz POWER6):
>
> 32bit: 273k/sec -> 283k/sec
> 64bit: 277k/sec -> 284k/sec
Any chance you can put that little test program online somewhere ?
Cheers,
Ben.
next prev parent reply other threads:[~2009-07-14 7:10 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-14 6:53 [patch 0/3] PowerPC context switch optimisations Anton Blanchard
2009-07-14 6:53 ` [patch 1/3] powerpc: Move 64bit VDSO to improve context switch performance Anton Blanchard
2009-07-14 7:07 ` Benjamin Herrenschmidt
2009-07-14 7:38 ` Anton Blanchard
2009-10-02 19:14 ` Andreas Schwab
[not found] ` <m2ocophale.fsf__34527.2158309401$1254511503$gmane$org@igel.home>
2009-10-03 14:15 ` Andreas Schwab
2009-10-03 14:51 ` Andreas Schwab
2009-10-03 21:53 ` Benjamin Herrenschmidt
2009-10-04 12:35 ` Andreas Schwab
2009-07-14 6:53 ` [patch 2/3] powerpc: Rearrange SLB preload code Anton Blanchard
2009-07-14 6:53 ` [patch 3/3] powerpc: Preload application text segment instead of TASK_UNMAPPED_BASE Anton Blanchard
2009-07-14 7:10 ` Benjamin Herrenschmidt [this message]
2009-07-14 7:27 ` Anton Blanchard
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