From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1HllRx-0005xN-RA for user-mode-linux-devel@lists.sourceforge.net; Wed, 09 May 2007 05:39:21 -0700 Received: from mu-out-0910.google.com ([209.85.134.188]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1HllRx-0003Wf-Cj for user-mode-linux-devel@lists.sourceforge.net; Wed, 09 May 2007 05:39:21 -0700 Received: by mu-out-0910.google.com with SMTP id i2so117181mue for ; Wed, 09 May 2007 05:39:20 -0700 (PDT) Message-ID: Date: Wed, 9 May 2007 18:09:19 +0530 From: "Lakshminarasimhan Naveenam" MIME-Version: 1.0 Subject: [uml-devel] Slow uml sessions List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============0727944323==" Sender: user-mode-linux-devel-bounces@lists.sourceforge.net Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: user-mode-linux-devel@lists.sourceforge.net --===============0727944323== Content-Type: multipart/alternative; boundary="----=_Part_90076_2036320.1178714359842" ------=_Part_90076_2036320.1178714359842 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi, When I run 2 uml sessions using netkit , kernel version is 2.6.18.5, the uml sessions become very slow. On the command prompt I keep getting this message: BUG: soft lockup detected on CPU#0! The var/log/messages has a lot of stack trace dump of the following type: dump_stack+0x1b/0x1f [<0808a61a>] softlockup_tick+0x7a/0x81 [<08079318>] run_local_timers+0x12/0x14 [<08079150>] update_process_times+0x3b/0x64 [<0805933d>] timer_handler+0x2c/0x4f [<08069c1f>] user_signal+0x4b/0x5c [<08069439>] userspace+0x214/0x240 [<0805aa31>] fork_handler+0x95/0x9d [] 0xb7fcd420 Anybody can help me understand whats going on? Thanks, simha. ------=_Part_90076_2036320.1178714359842 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Hi,
     When I run 2 uml sessions using netkit , kernel version is 2.6.18.5, the uml sessions become very slow. On the command prompt I keep getting this message:
BUG: soft lockup detected on CPU#0!

The var/log/messages has a lot of stack trace dump of the following type:

                      dump_stack+0x1b/0x1f
 [<0808a61a>] softlockup_tick+0x7a/0x81
[<08079318>] run_local_timers+0x12/0x14
[<08079150>] update_process_times+0x3b/0x64
[<0805933d>] timer_handler+0x2c/0x4f
[<08069c1f>] user_signal+0x4b/0x5c
[<08069439>] userspace+0x214/0x240
[<0805aa31>] fork_handler+0x95/0x9d
[<b7fcd420>] 0xb7fcd420

Anybody can help me understand whats going on?

Thanks,
simha.


------=_Part_90076_2036320.1178714359842-- --===============0727944323== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ --===============0727944323== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel --===============0727944323==-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1Hlo5M-0008SY-NJ for user-mode-linux-devel@lists.sourceforge.net; Wed, 09 May 2007 08:28:12 -0700 Received: from saraswathi.solana.com ([198.99.130.12]) by mail.sourceforge.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.44) id 1Hlo5L-0008Va-7Y for user-mode-linux-devel@lists.sourceforge.net; Wed, 09 May 2007 08:28:12 -0700 Date: Wed, 9 May 2007 11:22:50 -0400 From: Jeff Dike Message-ID: <20070509152250.GA20515@c2.user-mode-linux.org> References: Mime-Version: 1.0 Content-Disposition: inline In-Reply-To: Subject: Re: [uml-devel] Slow uml sessions List-Id: The user-mode Linux development list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: user-mode-linux-devel-bounces@lists.sourceforge.net Errors-To: user-mode-linux-devel-bounces@lists.sourceforge.net To: Lakshminarasimhan Naveenam Cc: user-mode-linux-devel@lists.sourceforge.net On Wed, May 09, 2007 at 06:09:19PM +0530, Lakshminarasimhan Naveenam wrote: > Hi, > When I run 2 uml sessions using netkit , kernel version is 2.6.18.5, > the uml sessions become very slow. On the command prompt I keep getting this > message: > BUG: soft lockup detected on CPU#0! I would recommend a newer UML. I used to see these on a very regular basis, but haven't in a long time. I don't know whether it was the host or UML since both have been upgraded multiple times. UML has had a number of performance improvements since 2.6.18, so this may help, and will make your life more pleasant even if it didn't have anything to do with the soft lockups. Jeff -- Work email - jdike at linux dot intel dot com ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel