From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with SMTP id 54F8F8D0001 for ; Thu, 4 Nov 2010 19:59:15 -0400 (EDT) Date: Fri, 5 Nov 2010 00:48:17 +0100 (CET) From: Jesper Juhl Subject: Re: 2.6.36 io bring the system to its knees In-Reply-To: Message-ID: References: <20101028090002.GA12446@elte.hu> <20101028133036.GA30565@elte.hu> <20101028170132.GY27796@think> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Chris Mason Cc: Ingo Molnar , Pekka Enberg , Aidar Kultayev , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Andrew Morton , Jens Axboe , Peter Zijlstra , Nick Piggin , Arjan van de Ven , Thomas Gleixner , Ted Ts'o , Corrado Zoccolo , Shaohua Li , Sanjoy Mahajan , Steven Barrett List-ID: On Fri, 5 Nov 2010, Jesper Juhl wrote: > On Thu, 28 Oct 2010, Chris Mason wrote: > > > On Thu, Oct 28, 2010 at 03:30:36PM +0200, Ingo Molnar wrote: > > > > > > "Many seconds freezes" and slowdowns wont be fixed via the VFS scalability patches > > > i'm afraid. > > > > > > This has the appearance of some really bad IO or VM latency problem. Unfixed and > > > present in stable kernel versions going from years ago all the way to v2.6.36. > > > > Hmmm, the workload you're describing here has two special parts. First > > it dramatically overloads the disk, and then it has guis doing things > > waiting for the disk. > > > > Just want to chime in with a 'me too'. > > I see something similar on Arch Linux when doing 'pacman -Syyuv' and there > are many (as in more than 5-10) updates to apply. While the update is > running (even if that's all the system is doing) system responsiveness is > terrible - just starting 'chromium' which is usually instant (at least > less than 2 sec at worst) can take upwards of 10 seconds and the mouse > cursor in X starts to jump a bit as well and switching virtual desktops > noticably lags when redrawing the new desktop if there's a full screen app > like gimp or OpenOffice open there. This is on a Lenovo Thinkpad R61i > which has a 'Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz' CPU, 2GB of > memory and 499996 kilobytes of swap. > Forgot to mention the kernel I currently experience this with : [jj@dragon ~]$ uname -a Linux dragon 2.6.35-ARCH #1 SMP PREEMPT Sat Oct 30 21:22:26 CEST 2010 x86_64 Intel(R) Core(TM)2 Duo CPU T7250 @ 2.00GHz GenuineIntel GNU/Linux -- Jesper Juhl http://www.chaosbits.net/ Plain text mails only, please http://www.expita.com/nomime.html Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org