Messages in this thread | | | Date | Sun, 19 Oct 2003 08:43:27 -0700 | From | "Martin J. Bligh" <> | Subject | Re: [2.6 patch] add a config option for -Os compilation |
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>> On Sat, Oct 18, 2003 at 10:24:02AM -0700, Andrew Morton wrote: >> > "Martin J. Bligh" <mbligh@aracnet.com> wrote: >> > > >> > > Please don't - I benchmarked it a while ago, and it's definitely slower. >> > >> > Alan said he generally found -Os to be faster... >> >> Not exactly: >> http://www.ussg.iu.edu/hypermail/linux/kernel/0211.0/1513.html >> > > http://www.ussg.iu.edu/hypermail/linux/kernel/0308.1/1261.html > > And bear in mind that you can see significant changes in benchmark results > between equivalent kernels even when the optimisation level is kept the > same, due to aliasing and alignment luck. > > It would take a quite a lot of work to measure this properly. A simple A/B > comparison doesn't cut it.
So why are we changing it then? ;-) We don't seem to have much evidence either way. What are the distros doing?
M.
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