From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Subrahmanyam Ongole <songole@gmail.com>
Cc: William Lee Irwin III <wli@holomorphy.com>, linux-kernel@vger.kernel.org
Subject: Re: x86-64: Kernel with large page size
Date: Sat, 04 Jun 2005 12:28:47 +1000 [thread overview]
Message-ID: <42A111DF.8070806@yahoo.com.au> (raw)
In-Reply-To: <20050604005930.GA31508@holomorphy.com>
William Lee Irwin III wrote:
> On Fri, Jun 03, 2005 at 05:50:55PM -0700, Subrahmanyam Ongole wrote:
>
>>When we run our application on AMD Opteron processors, we are seeing a
>>large number of L1_AND_L2_DTLB_MISSES. We used oprofile to measure
>>these numbers.
[...]
>
>
> PAGE_SIZE at the moment is intimately tied to the MMU's notions of
> address translation, which are determined by hardware.
>
And even if we were able to increase the PAGE_SIZE that
the kernel uses, this wouldn't really help your TLB misses.
You may be able to use "huge pages" for your workload, which
can use the 2/4MB pages. There is some good documentation for
it in Documentation/vm/ (and probably on the web).
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next prev parent reply other threads:[~2005-06-04 2:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-06-04 0:50 x86-64: Kernel with large page size Subrahmanyam Ongole
2005-06-04 0:59 ` William Lee Irwin III
2005-06-04 2:28 ` Nick Piggin [this message]
2005-06-11 9:58 ` Andi Kleen
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