Messages in this thread |  | | Date | Mon, 05 Nov 2001 00:37:55 -0800 | From | Andrew Morton <> | Subject | Re: 2.4.13-ac5-preempt, overflow in cached memory stat? |
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Robert Love wrote: > > > PS I know you keep hearing this, but that preempt patch makes for some > > damn smooth interactive performance ;) > > I can't hear it enough :) >
umm... Look. Sorry. But I don't see any theoretical reason why interactivity should be noticeably different from the little patch at
http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.14pre7aa2/00_lowlatency-fixes-2
and I did some quantitative testing a week or so back which bears this out. With either patch, worst-case latencies are very rare, and very bad. Usual latencies are excellent.
Is there any reason why preempt should be noticeably better than that little patch? If it is, then where on earth are the problematic commonly-occuring, long-running, lock-free code paths?
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