From mboxrd@z Thu Jan 1 00:00:00 1970 From: Konrad Rzeszutek Wilk Subject: Re: Xen dom0 network I/O scalability Date: Wed, 27 Apr 2011 13:50:25 -0400 Message-ID: <20110427175025.GD31181@dumpdata.com> References: <2D693F50-E757-4DAA-8B67-041CB01AC250@rice.edu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <2D693F50-E757-4DAA-8B67-041CB01AC250@rice.edu> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Kaushik Kumar Ram Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org 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 patches. > > Thanks. > --Kaushik > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel