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-users

Re: [Xen-users] Slow IO Performance

To: Anand <xen.mails@xxxxxxxxx>
Subject: Re: [Xen-users] Slow IO Performance
From: Molle Bestefich <molle.bestefich@xxxxxxxxx>
Date: Tue, 17 Jan 2006 16:10:36 +0100
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 17 Jan 2006 15:18:17 +0000
Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=si9btmX/cJLLnMqw8o3UYRfNy+13l+g0PkZROWikUDaXZpLwC8zR+5LTKu+GPzNJvn9FwOCuBe9wH+z5FuqN4KQ48Nw7YNTdAJmf0c4BBdS7LICnPqtxU5S/bulBJ7pIAzjSitBcqyZz8HYSuG6AmSRgoPcpLjgfGAMmxso1owY=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <acb757c00601140041u1ef36e68ga62573d116656a47@xxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <11372121854ugi1hrbidadam@xxxxxxxxxxx> <acb757c00601140041u1ef36e68ga62573d116656a47@xxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Anand wrote:
>  Timing cached reads:   932 MB in  2.00 seconds = 466.00 MB/sec
>  Timing buffered disk reads:   68 MB in  3.07 seconds =  22.15 MB/sec

Your system seems a bit sluggish too, doesn't it?
I'm getting 55-60 MB/sec for buffered reads and 1600 for cached.

AFAIK, standard modern ATA disks should give you around 50 MB/sec read speed...

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