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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
