Re: SMP kernel on uniprocessor system?

Andrea Arcangeli (andrea@suse.de)
Mon, 4 Oct 1999 16:44:48 +0200 (CEST)


On Mon, 4 Oct 1999 afei@jhu.edu wrote:

>> On Sun, 3 Oct 1999 afei@jhu.edu wrote:
>>
>> >The disadvantage is obvious: It will greatly reduce the performance,
>> >especially the scheduling/rescheduling part within the kernel.
>>
>> Not true. If the SMP scheduler works bad on a UP processor then it's the
>> SMP scheduler to be buggy.
>The SMP scheduler used on a UP, even work perfectly, is a waste of CPU
>time and memory. Check it out.

It's a waste of course. But it won't greatly reduce the performance as
quoted above. It won't work bad.

It will be some unit slower as the whole kernel will be due locking
overhead, not necessary checks and so on. But it won't be greatly
slowwwer. You won't see the slowdown with your eyes at least.

Andrea

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