Using SCHED_ULE vs. SCHED_4BSD ...

[Michael Vince]

Kiffin Gish wrote:

>I recently upgraded from 5.4 to 6.0 and noticed the introduction of
>option SCHED_ULE for supporting multi-processor environments.
>
>However, I understood that using SCHED_ULE with only one CPU can also
>improve performance significantly.
>
>Is this true, and if so, what are the risks involved dropping good old
>SCHED_4BSD for the new-and-improved scheduler?
>
>Thanks alot in advance.
>
>  
>
I was benchmarking a Java servlet under ULE a few weeks ago, and I 
couldn't get result scores as high under ULE as I could under the 
regular the 4BSD (although it wasn't too far off) and when I left the 
machine benchmarking all night under ULE I came back in the morning to 
find the machine unresponsive and in need of a hard reboot.

Mike