Messages in this thread |  | | Date | Fri, 27 Oct 2000 21:23:56 +1100 | From | Andrew Morton <> | Subject | Re: Negative scalability by removal of lock_kernel()?(Was: Strange performance behavior of 2.4.0-test9) |
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Andi Kleen wrote: > > When you have two CPUs contending on common paths it is better to do: > [ spinlock stuff ]
Andi, if the lock_kernel() is removed then the first time the CPUs will butt heads is on a semaphore. This is much more expensive.
I bet if acquire_fl_sem() and release_fl_sem() are turned into lock_kernel()/unlock_kernel() then the scalability will come back. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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