SCHED_4BSD bad interactivity on 7.0 vs 6.3

Eugene Grosbein eugen at kuzbass.ru
Sun Jul 13 07:47:34 UTC 2008


On Sun, Jul 13, 2008 at 03:11:23AM +0200, Kris Kennaway wrote:

> >It seems like there has been a regression in interactivity from 
> >6.3-RELEASE to 7.0-RELEASE when using the SCHED_4BSD scheduler.  After 
> >upgrading my single-cpu amd64 box, 7.0 has much worse latency.  When 
> >running a kernel compile, there is a noticeable lag to echo my typing or 
> >scroll my browser windows, and playing an mp3 frequently cuts out for a 
> >second or two.  This did not happen on 6.3-RELEASE.
> 
> Are you sure it's not the x.org server bug that was present in the 
> version shipped with 7.0?

No, it's not. I have exactly the same problem with SCHED_4BSD
after upgrade from 6.3-STABLE to 7.0-STABLE. I didn't upgrade
my x.org 6.9.0, only OS (all 6.x compat shims are installed).
There is some sort of regression, certainly.

Eugene Grosbein


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