Really poor performance on /dev/ttyv* only

[Robert Watson]

On Tue, 1 Nov 2005, Szilveszter Adam wrote:

> On Tue, Nov 01, 2005 at 06:01:57PM +1030, Greg 'groggy' Lehey wrote:
>> I'd guess that this is a different situation.  FWIW, the Inspiron
>> series are laptops, and this is at the keyboard.  The machine is brand
>> new, and I've never had another version of FreeBSD on it, but I
>> suspect it's -CURRENT rather than the laptop.
>
> FWIW, I also see slugishness on my Toshiba Satellite Pro 4200 series 
> with yesterday's -CURRENT, it concerns not only keyboard input but also 
> eg sorting of my mail spool (mbox format) in mutt and changing between 
> messages etc. Interestingly enough, network activity is not affected. 
> However, this isn't new, I have seen it also with -CURRENT from 
> September.
>
> I use SCHED_ULE as the scheduler, if that matters.

I guess it matters primarily if the problem doesn't occur if you use 
SCHED_4BSD. :-)  Could you give that a try and see?

Robert N M Watson