Messages in this thread | | | Date | Sat, 08 Jul 2000 00:04:28 +0200 | From | Roger Larsson <> | Subject | Re: [linux-audio-dev] Re: [PATCH really] latency improvements, one reschedule moved |
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Zlatko Calusic wrote: > > Roger Larsson <roger.larsson@norran.net> writes: > > > Again... :-( > > > > Patch included this time... > > > > Hi, Roger, Linus, others! > > 2.4.0-test3-pre4 (which includes this patch) is really a pleasant > surprise. The I/O bandwidth has greatly improved and I'm still trying > to understand how can patch this simple be so effective. :) > > Great work Roger! > > I see this as the first (and most critical) step of returning my faith > in good performing 2.4.0-final. > > Keep up the good work! > -- > Zlatko
It was not intended to give better performance... (something masks the expected latency improvements - floppy is disturbing me, recal_interrupt. And kmem stuff - but that is more understandable we will issue additional 'kmem_cache_reap']
I examined the patches again and the fact that it runs do_try_to_free_pages periodically may improve performance due to its page cleaning effect - all pages won't be dirty at the same time...
But it has a downside too - it will destroy the LRU order of pages... PG_referenced loses some of its meaning...
Streaming writes are likely to gain the most. Non uniform random accesses may loose :-(
I have an idea...
/RogerL
-- Home page: http://www.norran.net/nra02596/
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