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Date: Sat, 07 Sep 2002 16:12:49 -0700
From: Andrew Morton <akpm@digeo.com>
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To: William Lee Irwin III <wli@holomorphy.com>
CC: Paolo Ciarrocchi <ciarrocchi@linuxmail.org>, linux-kernel@vger.kernel.org
Subject: Re: LMbench2.0 results
References: <20020907121854.10290.qmail@linuxmail.org> <3D7A2768.E5C85EB@digeo.com> <20020907200334.GI888@holomorphy.com>
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William Lee Irwin III wrote:
> 
> Paolo Ciarrocchi wrote:
> >> Hi all,
> >> I've just ran lmbench2.0 on my laptop.
> >> Here the results (again, 2.5.33 seems to be "slow", I don't know why...)
> 
> On Sat, Sep 07, 2002 at 09:20:56AM -0700, Andrew Morton wrote:
> > The fork/exec/mmap slowdown is the rmap overhead.  I have some stuff
> > which partialy improves it.
> 
> Hmm, Where does it enter the mmap() path? PTE instantiation is only done
> for the VM_LOCKED case IIRC. Otherwise it should be invisible.

Oh, is that just the mmap() call itself?

> Perhaps testing with overcommit on would be useful.

Well yes - the new overcommit code was a significant hit on the 16ways
was it not?  You have some numbers on that?
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