ULE/SCHED_SMP diff for 7.0
Dmitry Morozovsky
marck at rinet.ru
Tue Jul 17 21:16:52 UTC 2007
On Mon, 16 Jul 2007, Jeff Roberson wrote:
JR> http://people.freebsd.org/~jeff/ule.diff
JR>
JR> This patch is scheduled for inclusion in 7.0. I would like anyone who cares
JR> to run it to validate that it does not create any stability or performance
JR> regression over the existing ULE. This patch replaces ULE with SCHED_SMP,
JR> which will now no longer exist as a seperate fork of ULE.
JR>
JR> Briefly, this is still a very suitable scheduler for uniprocessor machines
JR> while providing stronger affinity and other performance improvements for
JR> multiprocessor machines.
JR>
JR> Even "works for me!" type responses are welcome so I know roughly how many
JR> people have tested before I commit this close to release.
Works for me with MSI S420 lapton (core2duo T2400) on fresh -CURRENT/i386
CPU: Genuine Intel(R) CPU T2400 @ 1.83GHz (1833.41-MHz 686-class CPU)
However, make -j3 buildworld buildkernel (trimmed GENERIC) time degraded by 7%:
marck at mck-s420:/var/tmp> ministat before after
x before
+ after
+------------------------------------------------------------------------------+
| x + |
| x + |
|x x x + + +|
||__MA____| |__A__| |
+------------------------------------------------------------------------------+
N Min Max Median Avg Stddev
x 5 36.33 36.77 36.45 36.486 0.16637307
+ 5 38.87 39.23 39.03 39.042 0.12774976
Difference at 95.0% confidence
2.556 +/- 0.216322
7.00543% +/- 0.59289%
(Student's t, pooled s = 0.148324)
before = kernel with SCHED_4BSD, after = SCHED_ULE with your patchset. Both
are without WITNESS/INVARIANTS.
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck at rinet.ru ***
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