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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>

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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

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