From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Date: Fri, 14 Mar 2003 17:33:30 +0000 Subject: Re: [Linux-ia64] page size > 16KB Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org 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