From mboxrd@z Thu Jan 1 00:00:00 1970 From: "John Hawkes" Date: Mon, 08 Nov 2004 17:31:06 +0000 Subject: Re: [PATCH] top level scheduler domain for ia64 Message-Id: <00ba01c4c5b8$bb659eb0$6700a8c0@comcast.net> List-Id: References: <200410191427.27336.jbarnes@engr.sgi.com> In-Reply-To: <200410191427.27336.jbarnes@engr.sgi.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org From: "Jesse Barnes" > > So tell me who wants a value other than 6, and what is the value > > that they want? I was hoping for some more specific advice in > > the kernel-parameters.txt file. What's a good choice for a 16-node > > machine? For a 128-node machine? > > I don't know. The original value I chose was 4, but I think Nick changed it > to 6 to get more overlap. Any ideas John? I haven't been able to get enough reliably reproducible performance numbers using the recent -mm kernels to allow me to experiment with different nodes-per-domain values. Using 6 and having an occasionally load-balancing umbrella covering all the CPUs in the system seems to behave reasonably for 64p and above. I just haven't tried other values, other than once trying 32 and without that all-CPU umbrella, and that performance was bad. John Hawkes