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] Xen dom0 network I/O scalability

To: Kaushik Kumar Ram <kaushik@xxxxxxxx>
Subject: Re: [Xen-devel] Xen dom0 network I/O scalability
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Wed, 27 Apr 2011 13:50:25 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Wed, 27 Apr 2011 10:52:59 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <2D693F50-E757-4DAA-8B67-041CB01AC250@xxxxxxxx>
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/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <2D693F50-E757-4DAA-8B67-041CB01AC250@xxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.20 (2009-06-14)
On Wed, Apr 27, 2011 at 12:30:27PM -0500, Kaushik Kumar Ram wrote:
> Hi folks,
> I have a few questions/clarifications about dom0 network I/O scalability. I 
> would appreciate any feedback/pointers.
> So the current implementation of netback does not scale beyond a single CPU 
> core, thanks to the use of tasklets, making it a bottleneck (please correct 
> me if I am wrong). I remember coming across some patches which attempts to 
> use softirqs instead of tasklets to solve this issue. But the latest version 
> of linux-2.6-xen.hg repo does not include them. Are they included in some 
> other version of dom0 Linux? Or will they be included in future? This seems 
> like a very important problem to solve especially as the number of VMs and 
> number of CPU cores go up. Is there any fundamental limitation in solving 
> this problem?

You should be using the 2.6.39 kernel or the 2.6.32 to take advantage of those 
> Thanks.
> --Kaushik

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

Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>