Peter Zijlstra wrote:
On Wed, 2007-11-21 at 15:34 -0500, Jie Chen wrote:
It is clearly that the synchronization overhead increases as the number
of threads increases in the kernel 2.6.21. But the synchronization
overhead actually decreases as the number of threads increases in the
kernel 2.6.23.8 (We observed the same behavior on kernel 2.6.22 as
well). This certainly is not a correct behavior. The kernels are
configured with CONFIG_SMP, CONFIG_NUMA, CONFIG_SCHED_MC,
CONFIG_PREEMPT_NONE, CONFIG_DISCONTIGMEM set. The complete kernel
configuration file is in the attachment of this e-mail.
From what we have read, there was a new scheduler (CFS) appeared from
2.6.22. We are not sure whether the above behavior is caused by the new
scheduler.
If I read this correctly, you say that: .22 is the first bad one right?
The new scheduler (CFS) was introduced in .23, so it seems another
change would be responsible for this.
Hi, Peter:
Yes. We did observe this in 2.6.22. Thank you.
--
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Jie Chen
Scientific Computing Group
Thomas Jefferson National Accelerator Facility
12000, Jefferson Ave.
Newport News, VA 23606
(757)269-5046 (office) (757)269-6248 (fax)
[email protected]
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