From: William Lee Irwin III <wli@holomorphy.com>
To: "David S. Miller" <davem@redhat.com>
Cc: akpm@digeo.com, ciarrocchi@linuxmail.org, linux-kernel@vger.kernel.org
Subject: Re: LMbench2.0 results
Date: Sun, 8 Sep 2002 02:12:06 -0700 [thread overview]
Message-ID: <20020908091206.GL888@holomorphy.com> (raw)
In-Reply-To: <20020908.012526.48196975.davem@redhat.com>
From: William Lee Irwin III <wli@holomorphy.com>
Date: Sun, 8 Sep 2002 01:28:21 -0700
> But if this were truly the issue, the allocation and deallocation
> overhead for pagetables should show up as additional pressure
> against zone->lock.
On Sun, Sep 08, 2002 at 01:25:26AM -0700, David S. Miller wrote:
> The big gain is not only that allocation/free is cheap, also
> page table entries tend to hit in cpu cache for even freshly
> allocated page tables.
> I think that is the bit that would show up in the mmap lmbench
> test.
I'd have to doublecheck to see how parallelized lat_mmap is. My
machines are considerably more sensitive to locking uglies than cache
warmth. (They're taking my machines out, not just slowing them down.)
Cache warmth goodies are certainly nice optimizations, though.
Cheers,
Bill
next prev parent reply other threads:[~2002-09-08 9:09 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-07 12:18 LMbench2.0 results Paolo Ciarrocchi
2002-09-07 12:27 ` Jeff Garzik
2002-09-07 18:53 ` Rik van Riel
2002-09-07 21:44 ` Alan Cox
2002-09-13 22:46 ` Pavel Machek
2002-09-07 14:33 ` James Morris
2002-09-09 22:22 ` Cliff White
2002-09-07 16:20 ` Andrew Morton
2002-09-07 20:03 ` William Lee Irwin III
2002-09-07 23:12 ` Andrew Morton
2002-09-07 23:01 ` William Lee Irwin III
2002-09-07 23:44 ` Martin J. Bligh
2002-09-08 17:07 ` Alan Cox
2002-09-08 18:11 ` Martin J. Bligh
2002-09-08 18:40 ` Andrew Morton
2002-09-08 20:48 ` Hugh Dickins
2002-09-08 21:51 ` Andrew Morton
2002-09-09 21:13 ` Alan Cox
2002-09-09 21:44 ` Andrew Morton
2002-09-09 22:09 ` Alan Cox
2002-09-08 7:51 ` Andrew Morton
2002-09-08 7:37 ` David S. Miller
2002-09-08 8:28 ` William Lee Irwin III
2002-09-08 8:25 ` David S. Miller
2002-09-08 9:12 ` William Lee Irwin III [this message]
2002-09-08 20:02 ` Daniel Phillips
2002-09-09 13:37 ` Rik van Riel
2002-09-09 16:16 ` Daniel Phillips
2002-09-09 16:26 ` Martin J. Bligh
2002-09-09 16:55 ` Daniel Phillips
2002-09-09 17:24 ` Martin J. Bligh
2002-09-09 21:11 ` Alan Cox
2002-09-09 16:52 ` Andrew Morton
-- strict thread matches above, loose matches on Subject: below --
2002-09-07 12:40 Paolo Ciarrocchi
2002-09-07 14:09 Shane Shrybman
2002-09-07 18:04 Paolo Ciarrocchi
2002-09-13 22:49 ` Pavel Machek
2002-09-07 18:09 Paolo Ciarrocchi
2002-09-08 7:51 ` Andrew Morton
2002-09-14 18:26 Paolo Ciarrocchi
2002-09-15 18:08 ` Pavel Machek
2002-09-22 12:42 Paolo Ciarrocchi
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