Messages in this thread |  | | | From | "Ma, Ling" <> | | Date | Thu, 3 Dec 2009 23:03:15 +0800 | | Subject | RE: [PATCH RFC] [X86] Compile Option Os versus O2 on latest x86 platform |
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> a key question is.. how much more memory do you have free due to -Os? > (because memory is cache is performance on a system level as well) The kernel code size from Os is 12M, that from O2 is 14M. > and how much less icache pressure is there? From perf stat report, cache reference(unified cache) from O2 is almost the same with Os.
Thanks Ling
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