From: Andrew Morton <akpm@digeo.com>
To: Hanna Linder <hannal@us.ibm.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [Lockmeter 2.5] BKL with 51ms hold time, prove me wrong
Date: Thu, 10 Apr 2003 18:50:06 -0700 [thread overview]
Message-ID: <20030410185006.5fd88c30.akpm@digeo.com> (raw)
In-Reply-To: <46950000.1050023701@w-hlinder>
Hanna Linder <hannal@us.ibm.com> wrote:
>
>
> My original purpose was to verify my lockmeter port is producing
> valid data so I was comparing to readprofile results. However, I saw
> these high hold times and wanted to show them to you. Here is the
> whole lockmeter output file:
> http://prdownloads.sourceforge.net/lse/lockmeter.rmapm
>
> Below is a snippet of lockmeter data from running Andrew Morton's
> rmap-test -m -i 10 -n 50 -s 600 -t 100 foo
> on a 2-way PIII 256MB RAM 500MHz System
I'm a bit surprised that even slow machine like that would take 50
milliseconds to truncate 128MB of file, but it's not impossible I guess.
Truncate is not really a fastpath. ext3 in -mm doesn't have any lock_kernels
in it.
next prev parent reply other threads:[~2003-04-11 1:37 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-11 1:15 Hanna Linder
2003-04-11 1:50 ` Andrew Morton [this message]
2003-04-11 18:15 ` Hanna Linder
2003-04-11 21:49 ` Andrew Morton
2003-04-11 2:08 ` Dave Hansen
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