From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger-Tang Date: Wed, 02 Nov 2005 18:59:04 +0000 Subject: Re: [RFC] 4-level page table directories. Message-Id: List-Id: References: <20051027041709.GA13193@attica.americas.sgi.com> In-Reply-To: <20051027041709.GA13193@attica.americas.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Robin, Thanks for running all those benchmarks. On 11/2/05, Robin Holt wrote: > Does anybody have any objections to making 4 level the default? My concern is that 4-level PT really isn't needed on ia64 for all but the largest machines and adding a 4-th level cannot possibly help performance and definitely has a (small) cost. I see that you have a CONFIG option now, which is good. I don't have a strong opinion what should be the default. Longer term, it would be good to settle on one implementation, so perhaps it's not a bad idea to make 4-level the default and see if anyone complains about performance regressions. --david -- Mosberger Consulting LLC, voice/fax: 510-744-9372, http://www.mosberger-consulting.com/ 35706 Runckel Lane, Fremont, CA 94536