From: William Lee Irwin III <wli@holomorphy.com>
To: Andrew Morton <akpm@digeo.com>
Cc: Dave McCracken <dmccr@us.ibm.com>, linux-mm@kvack.org
Subject: Re: shared pagetable benchmarking
Date: Fri, 20 Dec 2002 03:13:36 -0800 [thread overview]
Message-ID: <20021220111336.GH25000@holomorphy.com> (raw)
In-Reply-To: <3E02FACD.5B300794@digeo.com>
On Fri, Dec 20, 2002 at 03:11:09AM -0800, Andrew Morton wrote:
> Did a bit of timing and profiling. It's a uniprocessor
> kernel, 7G, PAE.
> The workload is application and removal of ~80 patches using
> my patch scripts. Tons and tons of forks from bash.
> 2.5 ends up being 13% slower than 2.4, after disabling highpte
> to make it fair. 3%-odd of this is HZ=1000. So say 10%.
> Pagetable sharing actually slowed this test down by several
> percent overall. Which is unfortunate, because the main
> thing which Linus likes about shared pagetables is that it
> "speeds up forks".
> Is there anything we can do to fix all of this up a bit?
For testing purposes, try removing the opportunistic mmap()-time
sharing.
Bill
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next prev parent reply other threads:[~2002-12-20 11:13 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-12-20 11:11 Andrew Morton
2002-12-20 11:13 ` William Lee Irwin III [this message]
2002-12-20 16:30 ` Dave McCracken
2002-12-20 19:59 ` Andrew Morton
2002-12-23 16:15 ` Dave McCracken
2002-12-23 23:54 ` Andrew Morton
2002-12-27 9:39 ` Daniel Phillips
2002-12-27 9:58 ` Andrew Morton
2002-12-27 15:59 ` Daniel Phillips
2002-12-27 20:02 ` Linus Torvalds
2002-12-27 20:16 ` Dave McCracken
2002-12-27 20:18 ` Linus Torvalds
2002-12-27 20:45 ` Dave McCracken
2002-12-27 20:50 ` Linus Torvalds
2002-12-27 23:56 ` Daniel Phillips
2002-12-28 0:45 ` Martin J. Bligh
2002-12-28 2:34 ` Andrew Morton
2002-12-28 3:10 ` Linus Torvalds
2002-12-28 6:58 ` Andrew Morton
2002-12-28 7:39 ` Ingo Molnar
2002-12-28 7:47 ` Linus Torvalds
2002-12-28 23:28 ` Andrew Morton
2002-12-28 3:19 ` Martin J. Bligh
2002-12-23 18:19 ` Dave McCracken
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