From: William Lee Irwin III <wli@holomorphy.com>
To: Jakob Oestergaard <jakob@unthought.net>,
Phy Prabab <phyprabab@yahoo.com>,
linux-kernel@vger.kernel.org
Subject: Re: Help understanding slow down
Date: Sun, 23 May 2004 18:28:28 -0700 [thread overview]
Message-ID: <20040524012828.GK1833@holomorphy.com> (raw)
In-Reply-To: <20040524012553.GG30687@unthought.net>
On Mon, May 24, 2004 at 03:25:53AM +0200, Jakob Oestergaard wrote:
> Eh, not if I read the numbers right:
> 2.6.7-p1: 24.86user 51.77system 2:58.87elapsed 42%CPU
> 24.86 + 51.77 = 76.63 seconds on CPU, 102.24 seconds of waiting
> 2.4.21: 28.68user 34.98system 1:12.34elapsed 87%CPU
> 28.68 + 34.98 = 63.66 seconds on CPU, 8.68 seconds of waiting
> So, 2.6.7-p1 spends 16.79 seconds more in the kernel as you observed,
> but it spends 93.56 seconds more waiting for I/O (or whatever).
> Unless I'm totally missing something, the wait seems to be the
> regression.
I'm sorry, you're right. Let's start by looking into IO activity.
Phy, could you log the output of vmstat(1) during the runs?
-- wli
next prev parent reply other threads:[~2004-05-24 1:28 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-24 0:32 Help understanding slow down Phy Prabab
2004-05-24 0:57 ` Phy Prabab
2004-05-24 1:04 ` William Lee Irwin III
2004-05-24 1:25 ` Jakob Oestergaard
2004-05-24 1:28 ` William Lee Irwin III [this message]
2004-05-24 1:51 ` Phy Prabab
2004-05-24 2:42 ` Nick Piggin
2004-05-24 2:43 ` Andrew Morton
2004-05-24 6:23 ` Phy Prabab
2004-05-24 6:27 ` William Lee Irwin III
2004-05-24 6:39 ` Phy Prabab
2004-05-24 7:21 ` Phy Prabab
2004-05-24 7:44 ` Nick Piggin
2004-05-24 7:50 ` Phy Prabab
2004-05-24 7:59 ` Nick Piggin
2004-05-24 10:43 ` Jakob Oestergaard
2004-05-24 14:13 ` Martin J. Bligh
2004-05-24 7:53 ` Andrew Morton
2004-05-24 8:00 ` Phy Prabab
2004-05-25 10:32 ` Ingo Molnar
2004-05-25 9:29 ` Andrew Morton
2004-05-25 11:42 ` Ingo Molnar
2004-05-25 9:58 ` Andrew Morton
2004-05-25 12:25 ` Ingo Molnar
2004-05-24 6:33 ` Paul Rolland
2004-05-24 17:28 ` Roger Luethi
-- strict thread matches above, loose matches on Subject: below --
2004-05-24 1:37 Robert M. Stockmann
2004-05-24 1:50 ` Phy Prabab
2004-05-24 3:31 ` Robert M. Stockmann
2004-05-24 6:14 ` Phy Prabab
2004-05-24 18:36 ` Robert M. Stockmann
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