Re: cvs commit: src/sys/kern sched_ule.c (fwd)

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_at_FreeBSD.org>
> To: src-committers_at_FreeBSD.org, cvs-src_at_FreeBSD.org, cvs-all_at_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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