From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] pte prefetching
Date: Thu, 24 Mar 2005 20:15:12 +0000 [thread overview]
Message-ID: <16963.8144.379547.857976@napali.hpl.hp.com> (raw)
In-Reply-To: <424269B9.9020306@yahoo.com.au>
>>>>> On Thu, 24 Mar 2005 18:18:17 +1100, Nick Piggin <nickpiggin@yahoo.com.au> said:
Nick> After applying the recent freepgt patchset from Hugh (on
Nick> lkml), the time to fork+exit a process mapping 64GB of address
Nick> (32MB of page tables) is 0.471s. With the prefetch patch, this
Nick> drops to 0.357s.
Looks like a nice improvement to me.
Does prefetching 1 line ahead give the best results? That's only
128/8\x16 PTEs. Assuming a 200 cycle latency, this would allow
for only 12.5 cycles/iteration. Especially for large (NUMA) machines,
prefetching further out might help more.
--david
next prev parent reply other threads:[~2005-03-24 20:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-24 7:18 [PATCH] pte prefetching Nick Piggin
2005-03-24 20:15 ` David Mosberger [this message]
2005-03-25 5:22 ` Nick Piggin
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