From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Wed, 12 Mar 2003 18:07:30 +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 Wed, 12 Mar 2003 09:49:41 -0800, Jesse Barnes said: Jesse> Really? What sorts of benchmarks have you done that show Jesse> large improvements? I ask because I can think of a few that Jesse> might benefit, but have yet to see real world improvements of Jesse> any significance, so I'm curious. Anything that's hurt significantly by TLB pressure will gain signifcantly. Even apps that stream through memory (e.g., STREAMS) can see significant gains. Other advantages are more reproducible results (since you're effectively getting some page coloring for "free") and much larger user virtual address space. However, the part that really surprised me is how little ordinary apps seem to suffer from the higher page-fault latency and increased internal fragmentation. I don't recall the exact numbers, but even a kernel compile ran almost as fast with 64KB page size as with 16KB page size. If you know of a real-world application that suffers significantly from 64KB page size, I'd like to hear about it. --david