Re: More ULE bugs fixed.

On Thu, 16 Oct 2003, Eirik Oeverby wrote:

> Jeff Roberson wrote:
> > On Wed, 15 Oct 2003, Eirik Oeverby wrote:
> >
> >
> >>Eirik Oeverby wrote:
> >>
> >>>Jeff Roberson wrote:
> >>>
> >>>
> >>>>I fixed two bugs that were exposed due to more of the kernel running
> >>>>outside of Giant.  ULE had some issues with priority propagation that
> >>>>stopped it from working very well.
> >>>>
> >>>>Things should be much improved.  Feedback, as always, is welcome.  I'd
> >>>>like to look into making this the default scheduler for 5.2 if things
> >>>>start looking up.  I hope that scares you all into using it more. :-)
> >>>
> >>>
> >>>Hi..
> >>>Just tested, so far it seems good. System CPU load is floored (near 0),
> >>>system is very responsive, no mouse sluggishness or random
> >>>mouse/keyboard input.
> >>>Doing a make -j 20 buildworld now (on my 1ghz p3 thinkpad ;), and
> >>>running some SQLServer stuff in VMWare. We'll see how it fares.
> >>
> >>Hi, just a followup message.
> >>I'm now running the buildworld mentioned above, and the system is pretty
> >>much unusable. It exhibits the same symptoms as I have mentioned before,
> >>mouse jumpiness, bogus mouse input (movement, clicks), and the system is
> >>generally very jerky and unresponsive. This is particularily evident
> >>when doing things like webpage loading/browsing/rendering, but it's
> >>noticeable all the time, no matter what I am doing. As an example, the
> >>last sentence I wote without seeing a single character on screen before
> >>I was finsihed writing it, and it appeared with a lot more typos than I
> >>usually make ;)
> >>
> >>I'm running *without* invariants and witness right now, i.e. a kernel
> >>100% equal to the SCHED_4BSD kernel.
> >
> >
> > Can you confirm the revision of your sys/kern/sched_ule.c file?  How does
> > SCHED_4BSD respond in this same test?
>
> Yes I can. From file:
> __FBSDID("$FreeBSD: src/sys/kern/sched_ule.c,v 1.59 2003/10/15 07:47:06
> jeff Exp $");
> I am running SCHED_4BSD now, with a make -j 20 buildworld running, and I
> do not experience any of the problems. Keyboard and mouse input is
> smooth, and though apps run slightly slower due to the massive load on
> the system, there is none of the jerkiness I have seen before.
>
> Anything else I can do to help?

Yup, try again. :-)  I found another bug and tuned some parameters of the
scheduler.  The bug was introduced after I did my paper for BSDCon and so
I never ran into it when I was doing serious stress testing.

Hopefully this will be a huge improvement.  I did a make -j16 buildworld
and used mozilla while in kde2.  It was fine unless I tried to scroll
around rapidly in a page full of several megabyte images for many minutes.

>
> /Eirik
>
> > Thanks,
> > Jeff
> >
> >
> >>Best regards,
> >>/Eirik
> >>
> >>
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