Date: Fri, 14 Jan 2005 21:26:18 +0100 From: Wilko Bulte <wb@freebie.xs4all.nl> To: John Baldwin <jhb@FreeBSD.org> Cc: freebsd-alpha@FreeBSD.org Subject: Re: processor type. Message-ID: <20050114202618.GA17050@freebie.xs4all.nl> In-Reply-To: <200501141425.07994.jhb@FreeBSD.org> References: <16866.32790.398095.651691@canoe.dclg.ca> <200501141043.00568.jhb@FreeBSD.org> <20050114182655.GC630@freebie.xs4all.nl> <200501141425.07994.jhb@FreeBSD.org>
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On Fri, Jan 14, 2005 at 02:25:07PM -0500, John Baldwin wrote.. > On Friday 14 January 2005 01:26 pm, Wilko Bulte wrote: > > On Fri, Jan 14, 2005 at 10:43:00AM -0500, John Baldwin wrote.. > > > > > On Friday 14 January 2005 02:43 am, Wilko Bulte wrote: > > > > On Thu, Jan 13, 2005 at 04:26:51PM -0800, David O'Brien wrote.. > > > > > > > > > On Mon, Jan 10, 2005 at 08:16:06AM -0500, David Gilbert wrote: > > > > > > I see in the compiler lines crawling by that gcc is asked to > > > > > > optimize for 'EV5' while being compatible with 'EV4'. My Alpha is > > > > > > an EV4 --- I'm wondering if I would see better performance with a > > > > > > different flag there, but the gcc manual doesn't even acknowledge [snip] > > I sort of expect the settings in /etc/make.conf to only apply to building > > world and not to building release. Correct? > > Yes, a release is built in a "clean-room" chroot where make.conf doesn't > affect what happens. In that case, the default values quoted at the top of AH, of course.. silly me. > this thread are used (tune for an ev5, but only use instructions on an ev4). > The idea is that the GENERIC kernel for a release should be optimized to run > on "common" machines while still supporting older models. There's certainly > no harm in bumping the default -mtune to ev6 if we feel that most Alpha users > are ev6 rather than ev5. Hm, I suppose I could do this in HEAD. I'll run an experiment with a worldstone built using an ev5 world and compare that to a worldstone built using an ev6 world. Stay tuned. -- Wilko Bulte wilko@FreeBSD.org
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