Messages in this thread | | | Subject | Re: [patch] sched: fix scheduling latencies for !PREEMPT kernels | From | Lee Revell <> | Date | Tue, 14 Sep 2004 22:11:29 -0400 |
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On Tue, 2004-09-14 at 21:39, William Lee Irwin III wrote: > > With Ingo's patches the worst case latency on the same machine as my XP > > example is about 150 usecs. So, it seems to me that Ingo's patches can > > achieve results as good or better than OSX even without the one or two > > "dangerous" changes, like the removal of lock_kernel around > > do_tty_write. > > The code we're most worried is buggy, not just nonperformant. >
Understood. The only dangerous change I know of in the VP patches is the one Alan took issue with, the aforementioned removal of lock_kernel in the tty code. IIRC this only produced a latency of about 300 usecs, and only when switching VT's from a console to X and back. My point was that it's quite possible that we can get OSX-like results without the more dangerous changes.
Ingo, if you want to send me a patch set without the more controversial changes, I can compare the performance. A diff against the latest VP patch would be OK.
Lee
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