Date: Thu, 15 Dec 2011 14:20:04 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: <perryh@pluto.rain.com>, <freebsd@jdc.parodius.com> Cc: tevans.uk@googlemail.com, attilio@freebsd.org, george+freebsd@m5p.com, freebsd-stable@freebsd.org, ohartman@zedat.fu-berlin.de Subject: Re: SCHED_ULE should not be the default Message-ID: <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>
next in thread | previous in thread | raw e-mail | index | archive | help
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 This is on a clean 8.2-RELEASE-p4 Upgrading to RELENG_9 fixed this but its a bit concerning that just changing the scheduler would cause the machine to panic on boot. 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 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 This was run 9.0-PRERELEASE kernel due to 4BSD panicing on boot under 8.2. 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. Regards Steve ================================================ This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337 or return the E.mail to postmaster@multiplay.co.uk.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?5350EDAC93604B6E93EDBD65A3038F88>