did the 2.3.10 run show more CPU idle than the 2.2.9 run? especially on
write-intensive workloads, the 2.3.7+ kernels seem to wait way more often
than they should. i haven't been able to track down exactly where the
extra waits are occurring, but it appears that one problem is
balance_dirty() in fs/buffer.c: it seems to wait far more often than is
needed.
classic disclaimer: the 2.3.x kernels are beta quality, and they need
some performance tuning because of the deep architectural changes they
have undergone recently.
- Chuck Lever
-- corporate: <chuckl@netscape.com> personal: <chucklever@netscape.net> or <cel@monkey.org>The Linux Scalability project: http://www.citi.umich.edu/projects/linux-scalability/
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