From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: Xen 4.1 rc1 test report Date: Tue, 25 Jan 2011 08:43:04 +0000 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: Haitao Shan , "Zheng, Shaohui" Cc: Ian Campbell , "xen-devel@lists.xensource.com" List-Id: xen-devel@lists.xenproject.org On 25/01/2011 06:24, "Haitao Shan" wrote: >> Performance(1 bug) >> 1. guest boot very slowly without limit dom0 cpu number on EX (Intel) >> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1719 >> > > This bug happened 1 year before. Keir has made a fix with c/s 20841, > which essentially holds the locked (and hence allocated) hypercall > page so that next hypercall can reuse it without doing alloc and mlock > again. By doing this, overhead of rschedule IPI as a result of > frequent mlock is greatly reduced. > > Late in year 2010, libxc introduced a new mechanism called hypercall > buffers, as you can refer c/s 22288~22312. Keir's fix is dropped in > this new framework. As a result, the bug appears again. > Probably the new framework auther can pick up Keir's fix again? Ian Campbell, I think (cc'ed). -- Keir > Shan Haitao