From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: [PATCHv2 0/3] Implement per-cpu reader-writer locks
Date: Thu, 26 Nov 2015 10:48:51 +0100
Message-ID: <1448531331.7833.214.camel@citrix.com>
References: <1448035423-24242-1-git-send-email-malcolm.crossley@citrix.com>
	<5654A98D.3050801@citrix.com> <5654ACDD.5050107@citrix.com>
	<56557847.1060707@citrix.com>
Mime-Version: 1.0
Content-Type: multipart/mixed; boundary="===============5750924641119867413=="
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta5.messagelabs.com ([195.245.231.135])
	by lists.xen.org with esmtp (Exim 4.72)
	(envelope-from <prvs=765479fb2=dario.faggioli@citrix.com>)
	id 1a1tAh-0006tW-98
	for xen-devel@lists.xenproject.org; Thu, 26 Nov 2015 09:48:59 +0000
In-Reply-To: <56557847.1060707@citrix.com>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Malcolm Crossley <malcolm.crossley@citrix.com>
Cc: xen-devel@lists.xenproject.org, Andrew Cooper <Andrew.Cooper3@citrix.com>, Ian Jackson <Ian.Jackson@eu.citrix.com>, George Dunlap <george.dunlap@citrix.com>, LarsKurth <lars.kurth@citrix.com>
List-Id: xen-devel@lists.xenproject.org

--===============5750924641119867413==
Content-Type: multipart/signed; micalg=pgp-sha1;
	protocol="application/pgp-signature"; boundary="=-wR2vQXvjz32eC0q3AbzG"

--=-wR2vQXvjz32eC0q3AbzG
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

[Cc-list edited]

On Wed, 2015-11-25 at 08:58 +0000, Malcolm Crossley wrote:
> On 24/11/15 18:30, George Dunlap wrote:
> > On 24/11/15 18:16, George Dunlap wrote:
> > > On 20/11/15 16:03, Malcolm Crossley wrote:
> > > >=C2=A0
> > > > Removing the cache line bouncing on a multi-socket Haswell-EP
> > > > system=20
> > > > dramatically improves performance, with 16 vCPU network IO
> > > > performance going=20
> > > > from 15 gb/s to 64 gb/s! The host under test was fully
> > > > utilising all 40=20
> > > > logical CPU's at 64 gb/s, so a bigger logical CPU host may see
> > > > an even better
> > > > IO improvement.
> > >=20
> > > Impressive -- thanks for doing this work.
>=20
> Thanks, I think the key to isolating the problem was using profiling
> tools. The scale
> of the overhead would not have been clear without them.
>=20
As an aside, if it's not too much work, a few hints and instruction on
how such profiling has been done would be helpful for others and for
the future.

For example, a post on The Xen Project's blog about that (that then can
be turned into a wiki page) would be awesome. :-)

Regards,
Dario
--=20
<<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)


--=-wR2vQXvjz32eC0q3AbzG
Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: This is a digitally signed message part
Content-Transfer-Encoding: 7bit

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1

iEYEABECAAYFAlZW1YMACgkQk4XaBE3IOsT2kQCfd+9aTrU8EIGA82NTg+2YyBXl
mYYAoKDc1OEJdjsBgYY00W2XwCON+NRI
=FAnm
-----END PGP SIGNATURE-----

--=-wR2vQXvjz32eC0q3AbzG--


--===============5750924641119867413==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel

--===============5750924641119867413==--