Messages in this thread | | | Subject | Re: Possible bug from kernel 2.6.22 and above | From | Peter Zijlstra <> | Date | Wed, 05 Dec 2007 21:36:42 +0100 |
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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.
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