From: James Cloos <cloos@jhcloos.com>
To: linux-kernel@vger.kernel.org
Cc: David Gibson <david@gibson.dropbear.id.au>
Subject: Re: MAP_SHARED bizarrely slow
Date: Wed, 27 Oct 2004 00:23:00 -0700 [thread overview]
Message-ID: <m3u0sgiq0b.fsf@lugabout.cloos.reno.nv.us> (raw)
In-Reply-To: <20041027064527.GJ1676@zax> (David Gibson's message of "Wed, 27 Oct 2004 16:45:27 +1000")
>>>>> "David" == David Gibson <david@gibson.dropbear.id.au> writes:
David> http://www.ozlabs.org/people/dgibson/maptest.tar.gz
David> On a number of machines I've tested - both ppc64 and x86 - the
David> SHARED version is consistently and significantly (50-100%)
David> slower than the PRIVATE version.
Just gave it a test on my laptop and server. Both are p3. The
laptop is under heavier mem pressure; the server has just under
a gig with most free/cache/buff. Laptop is still running 2.6.7
whereas the server is bk as of 2004-10-24.
Buth took about 11 seconds for the private and around 30 seconds
for the shared tests.
So if this is a regression, it predates v2.6.7.
-JimC
--
James H. Cloos, Jr. <cloos@jhcloos.com> <http://jhcloos.com>
next prev parent reply other threads:[~2004-10-27 7:23 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-27 6:45 David Gibson
2004-10-27 7:23 ` James Cloos [this message]
2004-10-27 7:59 ` David Gibson
2004-10-28 4:38 ` Ian Wienand
2004-10-27 8:06 ` Andrew Morton
2004-10-27 8:20 ` David Gibson
2004-10-27 8:30 ` James Cloos
2004-10-27 20:54 ` Bill Davidsen
2004-10-28 1:16 ` David Gibson
2004-10-28 5:54 ` dean gaudet
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