WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

Re: [Xen-devel] Re: xen hg tree from yesterda hangs when kernel console

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] Re: xen hg tree from yesterda hangs when kernel console is directed to ttyS0
From: Ben Thomas <bthomas@xxxxxxxxxxxxxxx>
Date: Thu, 23 Mar 2006 13:36:31 -0500
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Thu, 23 Mar 2006 18:37:51 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <E1FMU1X-0000OG-00@xxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <E1FMU1X-0000OG-00@xxxxxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla Thunderbird 1.0.7-1.1.fc4 (X11/20050929)
Hi Keir,

Thanks for the heads-up.  I'll certainly give it a try.

As this hang appears during boot, it's not clear how much reducing
spinlock contention will help.  At times, it's not even clear that
I make it into __start_xen.  Certainly, when I get a hang, I
never make it out of __start_xen/init_e820/print_e820_memory_map.
As it often stops in the middle of print_e820_memory_map
output, that's what lead to the suspicion about serial lines.
Clearly, though, it's merely a suspicion/guess.

Thanks,
-b

Keir Fraser wrote:
In unstable changeset 9419 I've reduced contention for the serial-line
spinlock, particularly in the serial ISR. It certainly has cleaned up
some weird behaviour that I was able to reproduce when I hit the
serial line hard from within Xen itself. It's not clear it'll fix your
problems, but worth testing.

 -- Keir


--
------------------------------------------------------------------------
Ben Thomas                                         Virtual Iron Software
bthomas@xxxxxxxxxxxxxxx                            Tower 1, Floor 2
978-849-1214                                       900 Chelmsford Street
                                                   Lowell, MA 01851

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel