From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Andrew Morton <akpm@osdl.org>
Cc: kenneth.w.chen@intel.com, mingo@redhat.com,
linux-kernel@vger.kernel.org, Judith Lebzelter <judith@osdl.org>
Subject: Re: Default cache_hot_time value back to 10ms
Date: Wed, 06 Oct 2004 15:00:05 +1000 [thread overview]
Message-ID: <41637BD5.7090001@yahoo.com.au> (raw)
In-Reply-To: <20041005215116.3b0bd028.akpm@osdl.org>
Andrew Morton wrote:
> This tunable caused an 11% performance difference in (I assume) TPCx.
> That's a big deal, and people will want to diddle it.
>
True. But 2.5 I think really is too low (for anyone, except maybe a
CPU with no/a tiny L2 cache).
> If one number works optimally for all machines and workloads then fine.
>
Yeah.. 10ms may bring up idle times a bit on other workloads. Judith
had some database tests that were very sensitive to this - if 10ms is
OK there, then I'd say it would be OK for most things.
> But yes, avoiding a tunable would be nice, but we need a tunable to work
> out whether we can avoid making it tunable ;)
>
Heh. I think it would be good to have a automatic thingy to tune it.
A smarter cache_decay_ticks calculation would suit.
> Not that I'm soliciting patches or anything. I'll duck this one for now.
>
OK. Any idea when 2.6.9 will be coming out? :)
next prev parent reply other threads:[~2004-10-06 5:00 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-06 0:42 Default cache_hot_time value back to 10ms Chen, Kenneth W
2004-10-06 0:47 ` Con Kolivas
2004-10-06 1:02 ` Nick Piggin
2004-10-06 0:58 ` Nick Piggin
2004-10-06 3:55 ` Andrew Morton
2004-10-06 4:30 ` Nick Piggin
2004-10-06 4:51 ` Andrew Morton
2004-10-06 5:00 ` Nick Piggin [this message]
2004-10-06 5:09 ` Andrew Morton
2004-10-06 5:21 ` Nick Piggin
2004-10-06 5:33 ` Andrew Morton
2004-10-06 5:46 ` Nick Piggin
2004-10-06 6:19 ` new dev model (was Re: Default cache_hot_time value back to 10ms) Jeff Garzik
2004-10-06 6:39 ` Andrew Morton
2004-10-06 8:56 ` Paolo Ciarrocchi
2004-10-06 9:44 ` bert hubert
2004-10-06 14:00 ` Andries Brouwer
2004-10-06 19:40 ` Jeff Garzik
2004-10-06 19:48 ` Jeff Garzik
2004-10-06 19:58 ` Jeff Garzik
2004-10-06 20:37 ` Geert Uytterhoeven
2004-10-07 1:08 ` Jeff Garzik
2004-10-07 0:02 ` Matt Mackall
2004-10-06 9:23 ` Ingo Molnar
2004-10-06 9:57 ` Paolo Ciarrocchi
2004-10-06 19:33 ` Jeff Garzik
2004-10-06 22:23 ` Martin J. Bligh
2004-10-06 5:52 ` Default cache_hot_time value back to 10ms Chen, Kenneth W
2004-10-06 19:27 ` Chen, Kenneth W
2004-10-06 19:39 ` Andrew Morton
2004-10-06 20:38 ` Chen, Kenneth W
2004-10-06 20:43 ` Andrew Morton
2004-10-06 23:14 ` Chen, Kenneth W
2004-10-07 2:26 ` Nick Piggin
2004-10-07 6:29 ` Ingo Molnar
2004-10-07 7:08 ` Jeff Garzik
2004-10-07 7:26 ` Ingo Molnar
2004-10-06 20:50 ` Ingo Molnar
2004-10-06 21:03 ` Chen, Kenneth W
2004-10-06 7:48 ` Ingo Molnar
2004-10-06 17:18 ` Chen, Kenneth W
2004-10-06 19:55 ` Ingo Molnar
2004-10-06 22:46 ` Peter Williams
2004-10-06 13:29 ` [patch] sched: auto-tuning task-migration Ingo Molnar
2004-10-06 13:44 ` Nick Piggin
2004-10-06 17:49 ` Chen, Kenneth W
2004-10-06 20:04 ` Ingo Molnar
2004-10-06 21:18 ` Chen, Kenneth W
2004-10-07 6:10 ` Ingo Molnar
2005-02-21 5:08 ` Paul Jackson
[not found] <200410071028.01931.habanero@us.ibm.com>
2004-10-07 15:58 ` Default cache_hot_time value back to 10ms Andrew Theurer
2004-10-08 9:47 ` Nick Piggin
2004-10-08 14:11 ` Andrew Theurer
-- strict thread matches above, loose matches on Subject: below --
2004-10-07 18:44 Albert Cahalan
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