sched_ule performance on single CPU

[Unga]

--- Pete French <petefrench at ticketswitch.com> wrote:

> > I have noted early April that RELENG_7 is upgraded
> to
> > sched_ule by default and gave it a try with
> sched_ule
> > until today. My desktop is a 3GHz single Intel
> Pentium
> > 4 processor with 512MB RAM. I have noted by
> desktop
> > response wise sched_4bsd is better, ie. the
> desktop is
> > more responsive.
> 
> Very curious - when I first installed 7.0 the
> desktop
> performance was horrible and people told me to
> switch from
> BSd to ULE shceduler. Which I did and it was much
> better,
> and I have used ULE on all machines even since. I
> amm
> surprised that you find it worse - what are the
> symptoms
> here ?
> 

Its not worse, its not as good as sched_4bsd. 

What I refer is, when quickly open multiple tabs (7 or
8) in firefox and click on the fist tab to type user
id while other tabs still downloading, its seems there
is a minor yet noticeable delay that I did not
experience with sched_4bsd.

When I close the firefox, its takes a noticeable delay
to go off the window too.

To me, its seems there is no noticeable gain with
sched_ule, but rather the desktop is bit slow to
respond.

My point is, the version of the sched_ule in FreeBSD
RELENG_7 is old, I like to give it a try with the
latest sched_ule to see at least both are equally good
on a single processor. The sched_ule should be better
on a multi processor machine, but I don't have a one
to test it.

Unga


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