Date: Sat, 26 Jun 1999 07:10:59 +1000 From: Bruce Evans <bde@zeta.org.au> To: freebsd-bugs@FreeBSD.ORG, sheldonh@uunet.co.za Subject: Re: kern/12381: Bad scheduling in FreeBSD Message-ID: <199906252110.HAA30316@godzilla.zeta.org.au>
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> > Not quite. The second PR states that FreeBSD uses a strange 2:1 > > time-slicing when having two CPU-intensive processes, one in the > > foreground and one in the background. In the first PR, I stated that > > also any I/O is very much affected by long-runners in the background, > > so that even processes not requiring much CPU-time but depending on > > I/O (network, disks) are affected. > > So surely the "problem" in the first PR would "go away" if the "problem" in > the second were resolved? The second PR seems to be a wrong guess at what causes the problem in the first PR. CPU-intensive processes shuld have almost no effect on i/o. Other people have observed the problems in the first PR. People at plutotech noticed that scheduling never worked for realtime or idle priority processes, and some systems have a problem with SWI_AST. Idle priority processes have other problems so they restricted to root. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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