From: Dario Faggioli <dario.faggioli@citrix.com>
To: Sisu Xi <xisisu@gmail.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>,
Meng Xu <xumengpanda@gmail.com>,
xen-devel <xen-devel@lists.xen.org>
Subject: Re: memory performance 20% degradation in DomU -- Sisu
Date: Wed, 12 Mar 2014 09:59:30 +0100 [thread overview]
Message-ID: <1394614770.31942.52.camel@Abyss> (raw)
In-Reply-To: <CAPqOm-qUfvQ0=DNSrg89noj=biUNtw_BmjCu_pANK0Q_HoAMuQ@mail.gmail.com>
[-- Attachment #1.1: Type: text/plain, Size: 921 bytes --]
On Tue, 2014-03-11 at 10:46 -0500, Sisu Xi wrote:
> Can you be more specific about the highest performance modes of the
> CPU? For all the experiments, I disabled hyperthreading and frequency
> scaling, so CPU should work at a constant speed.
>
It was about TurboBoost (or whatever it's called) mode:
http://en.wikipedia.org/wiki/Intel_Turbo_Boost
Some more info on this old blog post:
http://blog.xen.org/index.php/2011/11/29/baremetal-vs-xen-vs-kvm-redux/
If you're completely disabling cpufreq via BIOS, I'd say this is ruled
out, but I can't be 100% sure. Also, that should be fixed in recent
enough Xen and Dom0 kernel.
Dario
--
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
[-- Attachment #1.2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 198 bytes --]
[-- Attachment #2: Type: text/plain, Size: 126 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
prev parent reply other threads:[~2014-03-12 8:59 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-04 22:49 memory performance 20% degradation in DomU -- Sisu Sisu Xi
2014-03-04 23:00 ` Sisu Xi
2014-03-05 17:33 ` Konrad Rzeszutek Wilk
2014-03-05 20:09 ` Sisu Xi
2014-03-05 21:29 ` Gordan Bobic
2014-03-05 22:28 ` Konrad Rzeszutek Wilk
2014-03-06 10:31 ` Gordan Bobic
2014-03-05 22:09 ` Konrad Rzeszutek Wilk
2014-03-11 12:03 ` George Dunlap
2014-03-11 15:46 ` Sisu Xi
2014-03-11 20:21 ` Sisu Xi
2014-03-12 8:55 ` Dario Faggioli
2014-03-12 16:50 ` Sisu Xi
2014-03-13 10:25 ` George Dunlap
2014-03-12 8:59 ` Dario Faggioli [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1394614770.31942.52.camel@Abyss \
--to=dario.faggioli@citrix.com \
--cc=George.Dunlap@eu.citrix.com \
--cc=xen-devel@lists.xen.org \
--cc=xisisu@gmail.com \
--cc=xumengpanda@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.