From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jesse Barnes Date: Fri, 14 Mar 2003 19:00:36 +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 09:33:30AM -0800, Jesse Barnes wrote: > 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. richa pointed out that it would probably be a good idea to use perfmon to count L2DTLB_MISSES events for your app to see whether TLB misses are really causing a problem. Another good thing to do might be to run vmstat during your app run to see how much I/O wait time you're seeing, and whether you're saturating your block device, etc. Jesse