Date: Sat, 26 Jun 1999 22:11:19 +1000 (EST) From: Andrew MacIntyre <andymac@bullseye.apana.org.au> To: Sheldon Hearn <sheldonh@uunet.co.za> Cc: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/12381: Bad scheduling in FreeBSD Message-ID: <Pine.OS2.3.95.990626220319.103A-100000@CENTRAL> In-Reply-To: <199906251750.KAA30066@freefall.freebsd.org>
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On Fri, 25 Jun 1999, Sheldon Hearn wrote:
> The following reply was made to PR kern/12381; it has been noted by GNATS.
>
> From: Sheldon Hearn <sheldonh@uunet.co.za>
> To: Thomas Schuerger <schuerge@wjpserver.CS.Uni-SB.DE>
> Cc: freebsd-gnats-submit@freebsd.org
> Subject: Re: kern/12381: Bad scheduling in FreeBSD
> Date: Fri, 25 Jun 1999 19:42:05 +0200
>
> On Fri, 25 Jun 1999 19:40:29 +0200, Thomas Schuerger wrote:
>
> > The tests I did may not be the best ones to choose, but they ARE
> > real-life scenarios. And I DID an FTP test, demonstrating that
> > network transfer speed drops by about 25%. I would be glad if you
> > had some suggestions about what tests I could do.
>
> I just wonder if there isn't something _else_ at play that makes your
> results so different from Jose's.
I'm no guru, but I suspect that the reported symptoms are related to our
relatively unsophisticated SMP infrastructure (ie single giant kernel
lock etc). I draw this conclusion because performance results from
uniprocessor systems are degraded much less noticeably under the given
process load.
This is a separate from the scheduler/nice issue.
--
Andrew I MacIntyre "These thoughts are mine alone..."
E-mail: andrew.macintyre@aba.gov.au (work) | Snail: PO Box 370
andymac@bullseye.apana.org.au (play) | Belconnen ACT 2616
Fido: Andrew MacIntyre, 3:620/243.18 | Australia
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