From: Andrew Morton <akpm@osdl.org>
To: Philip Martin <philip@codematters.co.uk>
Cc: linux-kernel@vger.kernel.org, Nick Piggin <piggin@cyberone.com.au>
Subject: Re: 2.6.1 slower than 2.4, smp/scsi/sw-raid/reiserfs
Date: Mon, 2 Feb 2004 19:46:26 -0800 [thread overview]
Message-ID: <20040202194626.191cbb95.akpm@osdl.org> (raw)
In-Reply-To: <87oesieb75.fsf@codematters.co.uk>
Philip Martin <philip@codematters.co.uk> wrote:
>
> My test is a software build of about 200 source files (written in C)
> that I usually build using "nice make -j4". Timing the build on
> 2.4.24 I typically get something like
>
> 242.27user 81.06system 2:44.18elapsed 196%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (1742270major+1942279minor)pagefaults 0swaps
>
> and on 2.6.1 I get
>
> 244.08user 116.33system 3:27.40elapsed 173%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (0major+3763670minor)pagefaults 0swaps
I didn't notice the increase in system time.
Could you generate a kernel profile? Add `profile=1' to the kernel boot
command line and run:
sudo readprofile -r
sudo readprofile -M10
time make -j4
readprofile -n -v -m /boot/System.map | sort -n +2 | tail -40 | tee ~/profile.txt >&2
on both 2.4 and 2.6? Make sure the System.map is appropriate to the
currently-running kernel.
next prev parent reply other threads:[~2004-02-03 3:45 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-02-01 21:34 Philip Martin
2004-02-01 23:11 ` Andrew Morton
2004-02-01 23:42 ` Philip Martin
2004-02-01 23:52 ` Nick Piggin
2004-02-02 0:51 ` Philip Martin
2004-02-02 5:15 ` Nick Piggin
2004-02-02 8:58 ` Nick Piggin
2004-02-02 18:36 ` Philip Martin
2004-02-02 23:36 ` Nick Piggin
2004-02-02 23:49 ` Andrew Morton
2004-02-03 1:01 ` Philip Martin
2004-02-03 3:02 ` Nick Piggin
2004-02-03 16:44 ` Philip Martin
2004-02-03 0:34 ` Philip Martin
2004-02-03 3:52 ` Nick Piggin
2004-02-02 18:08 ` Philip Martin
2004-02-03 3:46 ` Andrew Morton [this message]
2004-02-03 16:46 ` Philip Martin
2004-02-03 21:29 ` Andrew Morton
2004-02-03 21:53 ` Philip Martin
2004-02-04 5:48 ` Nick Piggin
2004-02-04 17:50 ` Philip Martin
2004-02-04 23:38 ` Philip Martin
2004-02-05 2:49 ` Nick Piggin
2004-02-05 14:27 ` Philip Martin
2004-02-14 0:10 ` Philip Martin
2004-02-03 6:55 Samium Gromoff
2004-02-03 7:07 ` Andrew Morton
2004-02-03 7:52 ` Samium Gromoff
2004-02-03 7:57 ` Nick Piggin
2004-02-03 15:58 ` Valdis.Kletnieks
2004-02-03 7:13 ` Nick Piggin
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