ULE and Prescott question

Ivan Voras ivoras at freebsd.org
Wed Jul 22 20:34:11 UTC 2009

Scott Bennett wrote:
>      This is a curiousity question.  I'm running 7.2-STABLE at present on
> an old Inspiron XPS, which has a 3.4 GHz P4 Prescott CPU.  I have
> hyperthreading enabled in the kernel.  The question is:  is there any
> appreciable performance difference to be expected with this hardware setup
> between the ULE scheduler and the 4BSD scheduler?  Or does the fact that
> there is only one core eliminate any difference in performance
> characteristics?

I'd guess the second thing. It's not like there's cache to be shared
between cores, etc. ULE might still be better simply because it is more
modern. Anyway, all recent (7.1+) versions of FreeBSD ship with ULE as
default, and all FreeBSD versions < 7.0 have broken/unfinished ULE.

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 259 bytes
Desc: OpenPGP digital signature
Url : http://lists.freebsd.org/pipermail/freebsd-questions/attachments/20090722/b80c6ad0/signature.pgp

More information about the freebsd-questions mailing list