Jeremy Chadwick wrote:
On Sun, Jan 20, 2008 at 07:40:07PM +0100, TooMany Secrets wrote:
On 1/20/08, Stephen Montgomery-Smith <[EMAIL PROTECTED]> wrote:
Jason C. Wells wrote:
The comments regarding SCHED_ULE and SCHED_4BSD are inconsistent with
information found in the email archives. LINT says ULE is experimental.
The handbook doesn't mention ULE at all. The archives say ULE is the
new recommended scheduler.
If ULE is in fact the current recommendation, then a few docs need to be
updated.
To add to Jason's point - why does GENERIC still default to SCHED_4BSD?
Are there plans to change this before 7.0 is truly released?
Excuse me for my bad english...
This question was mentioned two or three months ago. The answer was
that in 7.1, after the ULE will be tested in 7.0, it will be the
defacto scheduler in FreeBSD. First, the scheduler need the best
benchark in the world; a few thousand users testing in real-life
situations on a daily basis.
This is correct. There was a very large discussion on freebsd-current
(which would've been discussing 7.x at that point) about what scheduler
should be the default for RELENG_7 (4BSD or the "new" ULE (a.k.a.
SMP2)). It was ""voted"" (note the quotes) that SCHED_4BSD should
remain the default until 7.1 was released, since if there turned out
to be a gigantic bug in the new scheduler, we wouldn't want people to
get bit by it (thus harming the stability reputation of -RELEASE and
-STABLE). The 4BSD scheduler is still considered stable and has a
track record to prove it.
In a way, SCHED_ULE on 7.x is still considered "experimental" in the
sense that it needs lots of people testing it. So far all the results
have been positive (unlike SCHED_ULE on 6.x and 5.x, which were very
broken -- hence the rewrite!).
If the OP wants to read the thread/discussion (it's long), I can dig up
a URL to it in the archives.
Thanks. You both answered my question admirably.
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