From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <396653EC.5D146D55@norran.net> Date: Sat, 08 Jul 2000 00:04:28 +0200 From: Roger Larsson MIME-Version: 1.0 Subject: Re: [linux-audio-dev] Re: [PATCH really] latency improvements, one reschedule moved References: <395D520C.F16DD7D6@norran.net> <39628664.7756172A@norran.net> <39638C9B.64AB2544@norran.net> <873dlnkpk1.fsf@atlas.iskon.hr> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: zlatko@iskon.hr Cc: Linus Torvalds , "linux-kernel@vger.rutgers.edu" , "linux-mm@kvack.org" List-ID: Zlatko Calusic wrote: > > Roger Larsson 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/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux.eu.org/Linux-MM/