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Re: FORTIFY_SOURCE for the kernel



> On Mon, 2006-01-23 at 07:53 -0600, Josh Boyer wrote:
>> > On Mon, 2006-01-23 at 11:30 +0900, Warren Togami wrote:
>
>> > Going off at a tangent....what would people think of the idea of
>> > switching to -Os in $RPM_OPT_FLAGS _after_ FC5 is released?
>>
>> If it results in some form of improvement in performance, I'm all for
>> it.
>
> The "s" in -Os stands for "size", not for "speed". So if -Os compiled
> code-execution is faster than the default CFLAGS, something must be
> broken elsewhere.

That's not true.  Yes, -Os stands for size.  However code size _can_
translate to performance increase.  Think about cache footprint, etc. 
Smaller code means more can fit in the cache.  It also results in a
smaller DRAM footprint for thinks like shared libraries, etc.

josh


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