RELENG_6: Which scheduler for SMP?

[Ian Lord]

At 23:20 2005-12-28, Kris Kennaway wrote:
>Mike Jakubik wrote:
>
>>Mark Ovens wrote:
>>
>>>I've never had any success with the ULE scheduler on my dual 
>>>Athlon box running RELENG_5; it was so unstable it made Windows 
>>>3.1 look stable. In fact my current build, cvsup'd a couple of 
>>>days ago, won't even boot with ULE.
>>>
>>> From what I remember, ULE was intended to become the default 
>>> scheduler during the life of 5.0 but that hasn't happened.
>>>
>>>I've just cvsup'd the source for RELENG_6 and I'm surprised to 
>>>find in the GENERIC config file:
>>>
>>>#options    SCHED_ULE    # ULE scheduler
>>>options     SCHED_4BSD    # 4BSD scheduler
>>>
>>>so it seems 4BSD is still the default scheduler. Is ULE _still_ 
>>>considered to be in development/experimental? Even the SMP config 
>>>file doesn't use ULE.
>>
>>
>>
>>There have been substantial improvements made to it since 5. 
>>However no one will be able to tell you if its 100% ready, you will 
>>just have to try it on your system.
Then what's the point of ULE if it's slower then 4BSD ? Is it more 
stable, more... ? I compiled my kernel with ULE since I though it 
would be better but you are starting to make me regret my decision :) 
(I didn't benchmark both options, still in developpement right now, 
nothing in production)