Re: Compiling 2.2.19 with -O3 flag

[Marcus Meissner]

In article <1022253543.962.236.camel@sinai> you wrote:
> On Fri, 2002-05-24 at 07:42, Alan Cox wrote:

>> Bench it and see. From my own experience -O3 made the kernel a lot larger
>> and reduced overall performance - in part because the kernel already 
>> explicitly figures out what it wants inlined.
>> 
>> Interestingly enough -Os outperformed -O2

> Heh, now that is interesting.

Not really, -Os implies -O2, cf gcc/toplev.c:

          if ((p[0] == 's') && (p[1] == 0))
            { 
              optimize_size = 1;

              /* Optimizing for size forces optimize to be 2.  */
              optimize = 2;
            }

CIao, Marcus