Date: Thu, 7 Jan 1999 06:42:35 -0500 (EST) From: Peter Dufault <dufault@hda.com> To: kpielorz@tdx.co.uk (Karl Pielorz) Cc: current@FreeBSD.ORG Subject: Re: Problem with -current, SMP and multiple 'nice' processes? Message-ID: <199901071142.GAA02126@hda.hda.com> In-Reply-To: <3694895D.37DEEE92@tdx.co.uk> from Karl Pielorz at "Jan 7, 99 10:15:57 am"
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> If I run the client again {as per RC5's instructions for SMP FreeBSD machines}
> the load average goes up to 2.0 (as I'd guess you'd expect), and the machine
> performs like a dog...
I think "maybe_resched()" doesn't work for SMP. It is called by
wakeup(). It is checking curproc directly.
For now it probably needs to do an unconditional need_resched()
in the SMP case.
Note that there is a revised version on ftp.freebsd.org in
pub/FreeBSD/development/misc/PATCHES.sched. It doesn't fix
this problem, but if someone is going to trace through things
I'd appreciate them working through that.
Peter
--
Peter Dufault (dufault@hda.com) Realtime development, Machine control,
HD Associates, Inc. Safety critical systems, Agency approval
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