WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-ia64-devel

Re: [Xen-ia64-devel] PATCH: rewrite vcpu_get_psr

To: Tristan Gingold <tgingold@xxxxxxx>
Subject: Re: [Xen-ia64-devel] PATCH: rewrite vcpu_get_psr
From: Alex Williamson <alex.williamson@xxxxxx>
Date: Mon, 28 May 2007 07:30:54 -0600
Cc: Xen-ia64-devel <xen-ia64-devel@xxxxxxxxxxxxxxxxxxx>
Delivery-date: Mon, 28 May 2007 06:29:38 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <20070528125327.GA2660@saphi>
List-help: <mailto:xen-ia64-devel-request@lists.xensource.com?subject=help>
List-id: Discussion of the ia64 port of Xen <xen-ia64-devel.lists.xensource.com>
List-post: <mailto:xen-ia64-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-ia64-devel>, <mailto:xen-ia64-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-ia64-devel>, <mailto:xen-ia64-devel-request@lists.xensource.com?subject=unsubscribe>
Organization: HP OSLO R&D
References: <20070509041033.GA2598@saphi> <1178828134.27751.21.camel@bling> <20070528125327.GA2660@saphi>
Sender: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
On Mon, 2007-05-28 at 14:53 +0200, Tristan Gingold wrote:
> On Thu, May 10, 2007 at 02:15:34PM -0600, Alex Williamson wrote:
> > On Wed, 2007-05-09 at 06:10 +0200, Tristan Gingold wrote:
> > > Hi,
> > > 
> > > a stripped-down version of a previous patch: reimplement
> vcpu_get_psr.
> > > 
> > > Should be a noop, I don't think performance should be affected.
> > 
> > Unfortunately...
> > 
> > with patch:
> > 
> > real    6m0.483s
> > user    21m10.680s
> > sys     1m18.470s
> > 
> > without patch:
> > 
> > real    4m47.767s
> > user    16m55.060s
> > sys     0m53.240s
> 
> Hi,
> 
> I can now reproduce this slow-down.
> 
> However I don't understand your figures: how can real time be less than user
> time ?  Isn't real time the elapsed time ?

  Parallel build, -j4.  The real time is the elapsed time, user is
cumulative across all 4 CPUs.  Thanks,

        Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.


_______________________________________________
Xen-ia64-devel mailing list
Xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-ia64-devel