 Home |
Products |
Support |
Community |
News |
xen-devel
Re: [Xen-devel] [PATCH] x86: introduce specialized clear_page()
| To: | Jan Beulich <jbeulich@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] x86: introduce specialized clear_page() |
| From: | Keir Fraser <keir@xxxxxxxxxxxxx> |
| Date: | Wed, 20 Jun 2007 16:53:41 +0100 |
| Delivery-date: | Wed, 20 Jun 2007 08:51:47 -0700 |
| Envelope-to: | www-data@xxxxxxxxxxxxxxxxxx |
| In-reply-to: | <4679656A.76E4.0078.0@xxxxxxxxxx> |
| List-help: | <mailto:xen-devel-request@lists.xensource.com?subject=help> |
| List-id: | Xen developer discussion <xen-devel.lists.xensource.com> |
| List-post: | <mailto:xen-devel@lists.xensource.com> |
| List-subscribe: | <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe> |
| List-unsubscribe: | <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe> |
| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
| Thread-index: | AcezUyxJaxqh2B9GEdyfcgAX8io7RQ== |
| Thread-topic: | [Xen-devel] [PATCH] x86: introduce specialized clear_page() |
| User-agent: | Microsoft-Entourage/11.3.3.061214 |
On 20/6/07 16:35, "Jan Beulich" <jbeulich@xxxxxxxxxx> wrote: >> I measure no benefit from the XMM version (nor from upgrading the SSE2 >> version on x86/64 to clear from %rax instead of %eax). I guess this is >> because the move is non-temporal and it's actually quite easy to max the >> memory bandwidth. > > Neither did I, except (obviously) on machines having SSE, but not SSE2 (which > was what I considered applying this for, with the additional need to tweak > idle vcpu handling so that in that context [where FP context altering doesn't > matter, as long as the rest of the system's aware of it] it could then be > used). Oh, yes. Well, that's not a very interesting set of CPUs to optimise for. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | Re: [Xen-devel] [PATCH] Fix the bad directory path "/var/lib/xen/", Daniel P. Berrange |
|---|---|
| Next by Date: | Re: [Xen-devel] [PATCH] Fix the bad directory path "/var/lib/xen/", Keir Fraser |
| Previous by Thread: | Re: [Xen-devel] [PATCH] x86: introduce specialized clear_page(), Jan Beulich |
| Next by Thread: | [Xen-devel] [PATCH] use clear_page() where-ever possible/reasonable, Jan Beulich |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
