From: Andrew Morton <akpm@osdl.org>
To: Phy Prabab <phyprabab@yahoo.com>
Cc: wli@holomorphy.com, jakob@unthought.net, linux-kernel@vger.kernel.org
Subject: Re: Help understanding slow down
Date: Mon, 24 May 2004 00:53:31 -0700 [thread overview]
Message-ID: <20040524005331.71465614.akpm@osdl.org> (raw)
In-Reply-To: <20040524063959.5107.qmail@web90007.mail.scd.yahoo.com>
Phy Prabab <phyprabab@yahoo.com> wrote:
>
> Okay, here is the output:
>
> 317955 total
> 0.1302
> 263633 poll_idle
> 4545.3966
> 6764 do_page_fault
> 5.1951
> 3650 kmap_atomic
It's strange that you appear to be using poll_idle(). Maybe it's an error
in the profiler - it sometimes makes mistakes in identifying small
functions.
But if you _are_ using poll_idle() and if your CPU is hyperthreaded then
yes, one "CPU" is going to take a performance hit from the "idle" one.
Is your CPU hyperthreaded? (cat /proc/cpuinfo)
Are you booting with "idle=poll"? Do `dmesg -s 1000000 | grep idle'.
next prev parent reply other threads:[~2004-05-24 7:54 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
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 [this message]
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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