From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Theurer Subject: Re: [PATCH] Optimizing x86-64 xenlinux using global pagesfor user mode (take 2) Date: Wed, 30 Aug 2006 09:35:23 -0500 Message-ID: <44F5A22B.7050403@us.ibm.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: Ian Pratt Cc: xen-devel@lists.xensource.com, "Nakajima, Jun" List-Id: xen-devel@lists.xenproject.org Ian Pratt wrote: >> The previous patch had a problem with the builder, which constructs the >> initial page tables with the USER bit on. And Xen couldn't distinguish >> kernel or use pages. It was partially checked avoiding the bug, and it's >> finished with this patch. > > Thanks. Have you any updated benchmark numbers as the bug could have > been giving quite a performance boost before. FWIW, I had been running more extensive testing on changeset 11225 (before global-bit) and 11229 (global-bit with revert/fix for dom0 builder), and they do not match the initial testing I did with rev 11118 + global_1 patch. In fact, I am not seeing really any improvement. I am not sure what is wrong. Should I just test xen-unstable-tip+newest_patch and see where we stand? -Andrew Theurer