From: Jesse Barnes <jbarnes@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [RFC] Convert pgtable cache to slab
Date: Wed, 13 Oct 2004 19:28:21 +0000 [thread overview]
Message-ID: <200410131428.21615.jbarnes@sgi.com> (raw)
In-Reply-To: <yq1zn2qtpyo.fsf@wilson.mkp.net>
On Wednesday, October 13, 2004 2:07 pm, Luck, Tony wrote:
> >With this patch I got a significant improvement in page fault time.
> >Standard 2.4.x was about 700ns on average. Generic 2.6.9rc4 is 3-4
> >usec, whereas the slabified pgtcache drops us back down to 600-700 ns.
>
> What was the benchmark you were running when you measured these?
>
> >Tested on zx1 and sn2.
>
> How does this scale on big sn2 systems? I assume that the answers are
> going to be just fine as the slab allocator per-cpu lists should be
> just as nice as local quicklists, but it would be nice to see some
> data.
Yeah, it would be interesting, though page faults in general don't scale very
well due to the way page_table_lock is used. Christoph had some patches for
that, but I don't think he's had time to work on them lately.
> Overall looks nice ... less code, and goes faster too, what more
> could we ask for!
>
> Perhaps "zero_cache" isn't as descriptive a name as it might be (not
> that I have any better suggestions :-(
Maybe pgtable_zero_cache or something?
Jesse
next prev parent reply other threads:[~2004-10-13 19:28 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-10-13 18:47 [RFC] Convert pgtable cache to slab Martin K. Petersen
2004-10-13 18:57 ` Jesse Barnes
2004-10-13 18:59 ` William Lee Irwin III
2004-10-13 19:07 ` Luck, Tony
2004-10-13 19:28 ` Jesse Barnes [this message]
2004-10-13 19:32 ` Martin K. Petersen
2004-10-13 19:32 ` Luck, Tony
2004-10-13 19:42 ` Martin K. Petersen
2004-10-13 19:49 ` Robin Holt
2004-10-13 19:50 ` Robin Holt
2004-10-13 20:23 ` Luck, Tony
2004-10-13 20:34 ` Martin K. Petersen
2004-10-13 20:37 ` Martin K. Petersen
2004-10-14 7:44 ` David Mosberger
2004-10-14 10:27 ` William Lee Irwin III
2004-10-14 11:00 ` David Mosberger
2004-10-14 11:07 ` Robin Holt
2004-10-14 11:10 ` David Mosberger
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