ULE Scheduler available in 5.3-RELEASE?

[Thomas T. Veldhouse]

Brooks Davis wrote:

>On Thu, Nov 11, 2004 at 09:29:08AM -0600, Thomas T. Veldhouse wrote:
>  
>
>>I just read in the release notes that 5.3-RELEASE has the new ULE 
>>scheduler available, but that 4BSD is the default scheduler.  I thought 
>>I read messages in freebsd-current indicating that the option to use ULE 
>>was completely removed from the 5.3 or even the RELENG_5 branch?  So, is 
>>ULE really available?
>>    
>>
>
>ULE is not available in 5.3 or RELENG_5 due to problems that were
>unfixed at the time of the release.
>
>-- Brooks
>
>  
>
Perhaps the release notes should be updated?

Here is a quote 
(http://www.freebsd.org/releases/5.3R/relnotes-i386.html#NEW):

"The ULE scheduler has been added as an additional scheduler. Note that 
the conventional one, which is called 4BSD, is still used as the default 
scheduler in the GENERIC kernel. For the average user, interactivity is 
reported to be better in many cases. This means less ``skipping'' and 
``jerking'' in interactive applications while the machine is very busy. 
This will not prevent problems due to overloaded disk subsystems, but it 
does help with overloaded CPUs. On SMP machines, ULE has per-CPU run 
queues which allow for CPU affinity, CPU binding, and advanced 
HyperThreading support, as well as providing a framework for more 
optimizations in the future. As fine-grained kernel locking continues, 
the scheduler will be able to make more efficient use of the available 
parallel resources."

Thanks in advance.

-- 
Thomas T. Veldhouse
Key Fingerprint: 07C7 BF05 4176 F50B A083  4542 0118 1315 761F D300
Spammers please contact me at renegade at veldy.net.

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