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/
Home Products Support Community News


Re: [Xen-devel] horrible nfs server performance on domU

To: Rik van Riel <riel@xxxxxxxxxx>
Subject: Re: [Xen-devel] horrible nfs server performance on domU
From: Tupshin Harper <tupshin@xxxxxxxxxxx>
Date: Sat, 05 Mar 2005 14:17:49 -0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Delivery-date: Sat, 05 Mar 2005 22:19:35 +0000
Envelope-to: xen+James.Bulpin@xxxxxxxxxxxx
In-reply-to: <Pine.LNX.4.61.0503051654100.31720@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-archive: <http://sourceforge.net/mailarchive/forum.php?forum=xen-devel>
List-help: <mailto:xen-devel-request@lists.sourceforge.net?subject=help>
List-id: List for Xen developers <xen-devel.lists.sourceforge.net>
List-post: <mailto:xen-devel@lists.sourceforge.net>
List-subscribe: <https://lists.sourceforge.net/lists/listinfo/xen-devel>, <mailto:xen-devel-request@lists.sourceforge.net?subject=subscribe>
List-unsubscribe: <https://lists.sourceforge.net/lists/listinfo/xen-devel>, <mailto:xen-devel-request@lists.sourceforge.net?subject=unsubscribe>
References: <42291031.4050805@xxxxxxxxxxx> <Pine.LNX.4.61.0503051654100.31720@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx
User-agent: Debian Thunderbird 1.0 (X11/20050116)
Rik van Riel wrote:

On Fri, 4 Mar 2005, Tupshin Harper wrote:

the "fileserver" domU has 256Mb allocated with 512MB of swap. I'm gettin
horrendous nfs performance (samba not really tested yet), and the fileserver
domU frequently is pegged at 99+% system cpu all being use by pdflush. The
swap is active but is not being used.

Time to try out whether profiling works in domU, so we can
figure out exactly where cpu time is being spent.  I'm willing
to help you debug this problem.

Great. Let me know of anything I can try. I'm happy to build custom kernels, try experimental patches, etc. I've never done any kernel profiling, but I'm happy to give it a shot. If you are referring to CONFIG_OPROFILE, then it seems that it's not selectable in a xen kernel atm


SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
Xen-devel mailing list