Date: Mon, 13 Dec 2004 09:15:23 -0500 (EST) From: Jeff Roberson <jroberson@chesapeake.net> To: current@freebsd.org Subject: Re: cvs commit: src/sys/kern sched_ule.c (fwd) Message-ID: <20041213091514.B9536@mail.chesapeake.net> In-Reply-To: <20041213081021.A9536@mail.chesapeake.net> References: <20041213081021.A9536@mail.chesapeake.net>
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On Mon, 13 Dec 2004, Jeff Roberson wrote:
> ULE works again with preemption and kse and so on. As far as I know, the
> only two problems with ULE currently are these:
^three
>
> 1) nice +20 processes steal too much time from workloads that have some
> amount of idle time and lots of context switches (buildworld).
> 2) a nice +20 process can not be killed until there is some idle time in
> the system.
> 3) Performance is not what it could be, especially on HTT.
>
> If you encounter any other problems with ULE, please email me directly,
> without a current cc, as this will ensure the least amount of lag in
> reply.
>
> Thanks,
> Jeff
>
> ---------- Forwarded message ----------
> Date: Mon, 13 Dec 2004 13:09:33 +0000 (UTC)
> From: Jeff Roberson <jeff@FreeBSD.org>
> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
> Subject: cvs commit: src/sys/kern sched_ule.c
>
> jeff 2004-12-13 13:09:33 UTC
>
> FreeBSD src repository
>
> Modified files:
> sys/kern sched_ule.c
> Log:
> - Take up a 'slot' while we're on the assigned queue, waiting to be
> posted to another processor. Otherwise, kern_switch() gets confused
> and tries to sched_add(NULL).
>
> Revision Changes Path
> 1.138 +16 -16 src/sys/kern/sched_ule.c
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