From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: Even faster page copy for Xen? Date: Thu, 15 Jul 2010 22:35:19 +0100 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Dan Magenheimer , Jan Beulich Cc: "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org It has to be said, possibly tmem excepted, there is very little page copying in Xen. -- Keir On 15/07/2010 19:15, "Dan Magenheimer" wrote: > Hi Jan, Keir -- > > My x86 assembly skills are much too poor to carefully evaluate > and, if of value, implement this in Xen but given your previous > interest, such as: > > http://xenbits.xensource.com/xen-unstable.hg?rev/8de4b4e9a435 > > the following might be worth looking at. > > Intel has just posted memcpy improvements for glibc for recent > popular Intel processor families here: > > http://article.gmane.org/gmane.comp.lib.glibc.alpha/15278 > > The preface to the above patch looks very enticing... > > Semi-related, I wonder if you know, if there were a > "copy_page_from_other_node()" to be used if the > caller is fairly sure that the page is being copied > between nodes, could this be made significantly faster > than a normal copy_page()? > > Thanks, > Dan