Date: Fri, 25 Jun 1999 20:46:06 +0200 From: Poul-Henning Kamp <phk@critter.freebsd.dk> To: Thomas Schuerger <schuerge@wjpserver.CS.Uni-SB.DE> Cc: freebsd-bugs@FreeBSD.ORG Subject: Re: kern/12381: Bad scheduling in FreeBSD Message-ID: <13707.930336366@critter.freebsd.dk> In-Reply-To: Your message of "Fri, 25 Jun 1999 11:40:03 PDT." <199906251840.LAA34516@freefall.freebsd.org>
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In message <199906251840.LAA34516@freefall.freebsd.org>, Thomas Schuerger write s: > > Basically, you want renice 20 pid to cause the affected pid to be > > allowed as close to no CPU time as possible while there are > > compute-bound processes at nice <20 running. > > > > Is this right? > > Yes, that's what I meant by bad scheduling. > > I think the nice-level only has a very minor effect in FreeBSD, which > is not what I expect in a Unix environment. What it means is that there is > no possibility to really run processes "in the background", e.g. sort of > in the "spare time" of the CPU (these processes still should become active every > now and then when more important processes are running, completely cutting them > off would not be what I'd want). Something like an exponential drop off with > increasing nice-levels would be fine, for example. In fact there is a way to do this, look at the rtprio man page. -- Poul-Henning Kamp FreeBSD coreteam member phk@FreeBSD.ORG "Real hackers run -current on their laptop." FreeBSD -- It will take a long time before progress goes too far! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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