Re: [tip:x86/asm] x86/defconfig: Turn onCONFIG_CC_OPTIMIZE_FOR_SIZE= y in the 64-bit defconfig

[Borislav Petkov]

On Sat, Jan 26, 2013 at 07:18:26AM -0800, H. Peter Anvin wrote:
> On the CPUs Ling is testing on the downsides of -Os probably matter
>less, in particular since rep movsb works well.
>
> It is questionable as a generic default, though.
>
> The whole -Ok discussion came from that.

Hmm,

maybe this warrants some sort of a text addition to the config option
about when and where it is ok to select -Os. Also, is it so that
on those CPUs, -Os is always better or at least neutral so that it
doesn't cause any perf regressions when people enable it? I mean, I
see only netperf and volano runs in the commit message, maybe running
a comprehensive set of benchmarks would give us a much more detailed
picture...

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
--
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/