From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261988AbUEXIAN (ORCPT ); Mon, 24 May 2004 04:00:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263340AbUEXIAM (ORCPT ); Mon, 24 May 2004 04:00:12 -0400 Received: from web90002.mail.scd.yahoo.com ([66.218.94.60]:21949 "HELO web90002.mail.scd.yahoo.com") by vger.kernel.org with SMTP id S261988AbUEXIAE (ORCPT ); Mon, 24 May 2004 04:00:04 -0400 Message-ID: <20040524080001.33595.qmail@web90002.mail.scd.yahoo.com> Date: Mon, 24 May 2004 01:00:01 -0700 (PDT) From: Phy Prabab Subject: Re: Help understanding slow down To: Andrew Morton Cc: wli@holomorphy.com, jakob@unthought.net, linux-kernel@vger.kernel.org In-Reply-To: <20040524005331.71465614.akpm@osdl.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andrew, I have turned HT off in the bios (caused non deterministic performance) and I did not configure the kernel for SMT. Additionally, looking at dmesg shows no idle-poll (and I do not boot the kernel with idle-poll). Should I post my config for this kernel? Thank you for your time. Phy --- Andrew Morton wrote: > Phy Prabab 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'. > __________________________________ Do you Yahoo!? Yahoo! Domains – Claim yours for only $14.70/year http://smallbusiness.promotions.yahoo.com/offer