Date: Thu, 15 Dec 2011 16:04:24 +0100 From: Lars Engels <lars.engels@0x20.net> To: Steven Hartland <killing@multiplay.co.uk> Cc: tevans.uk@googlemail.com, perryh@pluto.rain.com, attilio@freebsd.org, george+freebsd@m5p.com, freebsd-stable@freebsd.org, ohartman@zedat.fu-berlin.de, freebsd@jdc.parodius.com Subject: Re: SCHED_ULE should not be the default Message-ID: <20111215150424.GO54469@e-new.0x20.net> In-Reply-To: <5350EDAC93604B6E93EDBD65A3038F88@multiplay.co.uk> References: <4EE1EAFE.3070408@m5p.com> <CAJ-FndDniGH8QoT=kUxOQ%2BzdVhWF0Z0NKLU0PGS-Gt=BK6noWw@mail.gmail.com> <4EE2AE64.9060802@m5p.com> <4EE88343.2050302@m5p.com> <CAFHbX1%2B5PttyZuNnYot8emTn_AWkABdJCvnpo5rcRxVXj0ypJA@mail.gmail.com> <4EE933C6.4020209@zedat.fu-berlin.de> <20111215004205.GA11556@icarus.home.lan> <4eea1a4a.nJRbEc1jgKpVnVk4%perryh@pluto.rain.com> <5350EDAC93604B6E93EDBD65A3038F88@multiplay.co.uk>
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--PWWBnvahXisRTnWJ Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Dec 15, 2011 at 02:20:04PM -0000, Steven Hartland wrote: > With all the discussion I thought I'd give a buildworld > benchmark a go here on a spare 24 core machine. ULE > tested fine but with 4BSD it wont even boot panicing > with the following:- > http://screensnapr.com/v/hwysGV.png >=20 > This is on a clean 8.2-RELEASE-p4 >=20 > Upgrading to RELENG_9 fixed this but its a bit concerning > that just changing the scheduler would cause the machine > to panic on boot. >=20 > Its only a single run so varience could be high but here's > the result of a buildworld on this machine running the > two different schedulers:- > 4BSD: 24m54.10s real 2h43m12.42s user 56m20.07s sys > ULE: 23m54.68s real 2h34m59.04s user 50m59.91s sys >=20 > What really sticks out is that this is over double that > of an 8.2 buildworld on the same machine with the same > kernel > ULE: 11m12.76s real 1h27m59.39s user 28m59.57s sys 9.0 ships with gcc and clang which both need to be compiled, 8.2 only has gcc. >=20 > This was run 9.0-PRERELEASE kernel due to 4BSD panicing > on boot under 8.2. >=20 > So for this use ULE vs 4BSD is neither here-nor-there > but 9.0 buildworld is very slow (x2 slower) compared > with 8.2 so whats a bigger question in my mind. >=20 > Regards > Steve --PWWBnvahXisRTnWJ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk7qDHgACgkQKc512sD3afjIYwCgn3jnoJIKN8DZCxYJTP+SXF/7 wWUAn1a4d2gUG9DvPx/qscebVHUAXg2y =lqnD -----END PGP SIGNATURE----- --PWWBnvahXisRTnWJ--
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