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] File System Performance - 10x slower

To: Nauzad Sadry <nauzad@xxxxxxxxx>
Subject: Re: [Xen-devel] File System Performance - 10x slower
From: Steven Hand <Steven.Hand@xxxxxxxxxxxx>
Date: Tue, 11 Jan 2005 18:42:24 +0000
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 11 Jan 2005 18:43:29 +0000
Envelope-to: xen+James.Bulpin@xxxxxxxxxxxx
In-reply-to: Your message of "Tue, 11 Jan 2005 10:30:02 PST." <aa7b01ec05011110302b8a51ed@xxxxxxxxxxxxxx>
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>
Sender: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx
> I am evaluating File I/O performance using Xen & comparing it with
> baseline (Fedora Core 3, with 2.6.9 kernel).
>
[snip poor I/O results]
>
> Can someone why I am getting such huge difference in performance
> compared to baseline ??

What version of Xen are you using? 2.0.x [preferably 2.0.3]? 

Did you move /lib/tls out of the way on the various root filesystems? 

I ask since it should be almost *impossible* to get anything more 
than a very small % slowdown on disk I/O unless things are very 
broken -- most of our benchmarks to date show 0% slowdown (and 
in some cases involving domU, a speedup due to additional buffering). 


Can you post the output of Xen / dom0 / domU booting, and your
configuration files? 


cheers,

S.




-------------------------------------------------------
The SF.Net email is sponsored by: Beat the post-holiday blues
Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek.
It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/xen-devel