From: Roger Larsson <roger.larsson@norran.net>
To: zlatko@iskon.hr
Cc: Linus Torvalds <torvalds@transmeta.com>,
"linux-kernel@vger.rutgers.edu" <linux-kernel@vger.rutgers.edu>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: Re: [linux-audio-dev] Re: [PATCH really] latency improvements, one reschedule moved
Date: Sat, 08 Jul 2000 00:04:28 +0200 [thread overview]
Message-ID: <396653EC.5D146D55@norran.net> (raw)
In-Reply-To: 873dlnkpk1.fsf@atlas.iskon.hr
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
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next prev parent reply other threads:[~2000-07-07 22:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-07-01 2:06 [PATCH] latency improvements, one reschedule moved Roger Larsson
2000-07-05 0:50 ` Roger Larsson
2000-07-05 19:29 ` [PATCH really] " Roger Larsson
2000-07-06 19:48 ` Zlatko Calusic
2000-07-07 22:04 ` Roger Larsson [this message]
2000-07-08 1:58 ` [linux-audio-dev] " Linus Torvalds
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