From: Jesse Barnes <jbarnes@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [Linux-ia64] page size > 16KB
Date: Fri, 14 Mar 2003 17:33:30 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709806102@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709806057@msgid-missing>
On Fri, Mar 14, 2003 at 01:33:12PM +0100, Jan Schreckenbach wrote:
> yep, I'm doing some benchmark stuff with SAP/SAPDB and the performance
> is not as good as I expected. CONFIG_HUGETLB_PAGE=y is standard on a
> SLES8 kernel (2.4.19-SMP). I changed the page size from 16K to 64K
> and the performance increase was 2-3 percent. Changing Huge TLB Page
> Size" seems not to have any effect.
Are you using the huge TLB support (it's not transparent to the app).
If you're seeing a few percent going from 16k to 64k, I'd expect that
you'd see a bigger gain going from 16k to using the huge tlb api. See
Documentation/vm/hugetlbpage.txt in the kernel source for an idea of
how to make use it (not sure if the doc is up to date, haven't used it
myself).
Jesse
next prev parent reply other threads:[~2003-03-14 17:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-12 16:38 [Linux-ia64] page size > 16KB Jan Schreckenbach
2003-03-12 16:55 ` Grant Grundler
2003-03-12 17:07 ` n0ano
2003-03-12 17:40 ` David Mosberger
2003-03-12 17:46 ` David Mosberger
2003-03-12 17:49 ` Jesse Barnes
2003-03-12 18:07 ` David Mosberger
2003-03-12 18:08 ` Grant Grundler
2003-03-12 18:24 ` Jesse Barnes
2003-03-12 19:51 ` Mario Smarduch
2003-03-13 18:05 ` David Mosberger
2003-03-13 20:44 ` Mario Smarduch
2003-03-14 12:33 ` Jan Schreckenbach
2003-03-14 15:51 ` Chen, Kenneth W
2003-03-14 17:33 ` Jesse Barnes [this message]
2003-03-14 18:00 ` Mario Smarduch
2003-03-14 18:17 ` Grant Grundler
2003-03-14 19:00 ` Jesse Barnes
2003-03-14 19:43 ` David Mosberger
2003-03-15 3:08 ` Seth, Rohit
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