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Date:      Thu, 15 Dec 2011 17:56:38 +0100
From:      Attilio Rao <attilio@freebsd.org>
To:        Mike Tancsa <mike@sentex.net>
Cc:        Ivan Klymenko <fidaj@ukr.net>, mdf@freebsd.org, Doug Barton <dougb@freebsd.org>, freebsd-stable@freebsd.org, Jilles Tjoelker <jilles@stack.nl>, "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, Current FreeBSD <freebsd-current@freebsd.org>, freebsd-performance@freebsd.org
Subject:   Re: SCHED_ULE should not be the default
Message-ID:  <CAJ-FndCsGUTHM2AY3C%2B2ucup9=B5k0WPKmfcy4SDKNb0xv85BQ@mail.gmail.com>
In-Reply-To: <4EEA25BB.7040706@sentex.net>
References:  <4EE1EAFE.3070408@m5p.com> <4EE22421.9060707@gmail.com> <4EE6060D.5060201@mail.zedat.fu-berlin.de> <4EE69C5A.3090005@FreeBSD.org> <20111213104048.40f3e3de@nonamehost.> <20111213230441.GB42285@stack.nl> <4ee7e2d3.0a3c640a.4617.4a33SMTPIN_ADDED@mx.google.com> <CAMBSHm89SkzGVgk9kNwBQoR62pXKjhJ%2BqXJK0qwC20r9p%2Bu-bw@mail.gmail.com> <4EE8D607.1000504@sentex.net> <CAJ-FndBP1C5W-LAB4QF-ro%2BuaEaTx7ZzAAS3nXFY_82WXt53YQ@mail.gmail.com> <4EEA227E.7080704@sentex.net> <CAJ-FndAR10dwgtb11BLG2savNc8ZX9_nSkaj%2B5_RthDhsOgTnQ@mail.gmail.com> <4EEA25BB.7040706@sentex.net>

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2011/12/15 Mike Tancsa <mike@sentex.net>:
> On 12/15/2011 11:42 AM, Attilio Rao wrote:
>>
>> I'm thinking now to a better test-case for this: can you try that on a
>> tmpfs volume?
>
> There is enough RAM in the box so that it should not touch the disk, and
> I was sending the output to /dev/null, so it was not writing to the disk.
>
>>
>> Also what filesystem you were using?
>
> UFS
>
>> How many CPUs were in place?
>
> 4
>
>> Did you reboot before to move the steal_thresh value?
>
> No.

So, as very first thing, can you try the following:
- Same codebase, etc. etc.
- Make the test 4 times, discard the first and ministat for the other 3
- Reboot
- Change the steal_thresh value
- Make the test 4 times, discard the first and ministat for the other 3

Then report discarded values and the ministated one and we will have
more informations I guess
(also, I don't think devfs contention should play a role here, thus
nevermind about it for now).

Thanks,
Attilio


-- 
Peace can only be achieved by understanding - A. Einstein



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