From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265443AbUBAU64 (ORCPT ); Sun, 1 Feb 2004 15:58:56 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265445AbUBAU6z (ORCPT ); Sun, 1 Feb 2004 15:58:55 -0500 Received: from mail.tmr.com ([216.238.38.203]:17673 "EHLO gatekeeper.tmr.com") by vger.kernel.org with ESMTP id S265443AbUBAU6v (ORCPT ); Sun, 1 Feb 2004 15:58:51 -0500 To: linux-kernel@vger.kernel.org Path: not-for-mail From: Bill Davidsen Newsgroups: mail.linux-kernel Subject: Re: 2.6.2-rc2 Interactivity problems with SMP + HT Date: Sun, 01 Feb 2004 16:00:31 -0500 Organization: TMR Associates, Inc Message-ID: <401D68EF.9030109@tmr.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Trace: gatekeeper.tmr.com 1075669104 10086 192.168.12.10 (1 Feb 2004 20:58:24 GMT) X-Complaints-To: abuse@tmr.com Cc: "Robert M. Hyatt" , Nick Piggin , linux-kernel@vger.kernel.org, linux-smp@vger.kernel.org To: Catalin BOIE User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6b) Gecko/20031208 X-Accept-Language: en-us, en In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Catalin BOIE wrote: > On Thu, 29 Jan 2004, Robert M. Hyatt wrote: > > >> >>It might be some IDE disk I/O that results from flushing buffers or >>whatever. I don't see this on my SCSI boxes, but I have seen an IDE >>box get sluggish at times due to I/O. > > > It is possible. > vmstat shows a lot of writes when this happen. > Seems that even reads hangs. > I remember tat I was in pine and I tried to save a small file (under 1k) > and it took 5-7 seconds to do it. > > >>On Thu, 29 Jan 2004, Nick Piggin >>wrote: >> >> >>> >>>Catalin BOIE wrote: >>> >>> >>>>Hello! >>>> >>>>First, thank you very much for the effort you put for Linux! >>>> >>>>I have a Intel motherboard with SATA (2 Maxtor disks). >>>>CPUs: 2 x 2.4GHz PIV HT = 4 processors (2 virtual) >>>>1 GB RAM. >>>> >>>>Load: postgresql and apache. Very low load (3-4 clients). >>>> >>>>RAID: Yes, soft RAID1 between the 2 disks. >>>> >>>>I have times when the console freeze for 3-4 seconds! >>>>2.6.0-test11 had the same problem (maybe longer times). >>>>2.6.1-rc2 worked good in this respect but crashed after 2 days. :( >>>>2.6.2-rc2 is back with the delay. >>>> >>>>Do you know why this can happen? >>>> >>>> >>> >>>There haven't been many scheduler changes there recently so >>>maybe its something else. >>> >>>But you could try the latest -mm kernels. They have some >>>Hyperthreading work in them (you need to enable CONFIG_SCHED_SMT). Another possible improvement might come from the recent ide changes posted here for evaluation. There was a change to not block all devices or even all devices on a cable if one device delayed. I believe it was if a command didn't finish as intended, but I don't have it handy since I sent it off for testing tomorrow on a system which may have that problem. There's a good bit of work on hangs happening right now, so you could wait or dig up the patches and try them. I think they were by Davin McCall if memory serves. -- bill davidsen CTO TMR Associates, Inc Doing interesting things with small computers since 1979