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SubjectAW: Kernel 2.6.3 patch for Intel Compiler 8.0
Date
Hi again,

please read my last mail carefully:
"33% procs faster on icc, 66% faster on gcc"
means that gcc (GNU) is superior. But the patch is a preliminary
version...

greetings, Ingo.

-----Ursprüngliche Nachricht-----
Von: Norihiko Mukouyama [mailto:norihiko_m@jp.fujitsu.com]
Gesendet: Mittwoch, 10. März 2004 01:50
An: Ingo at Pyrillion; 'Norberto Bensa'
Cc: linux-kernel@vger.kernel.org
Betreff: RE: Kernel 2.6.3 patch for Intel Compiler 8.0

Hi All!!

>I used the patch to compile two identical kernels with gcc 3.3.3 and
>icc 8.0 with oprofile support built in. The optimization switches were
>chosen quite conservative, i.e. "-O2 -Ob1", no IPO, and of course: no
>MMX, SSE, and SSE2 stuff inside the kernel (thus disabling Intel's
>great vectorizer).
>Profiling: lmbench ran ten times but time measurements were taken from
>oprofile (on Pentium 4, GLOBAL_POWER_EVENTS in kernel space only,
>counter overflow: 3.000).
>Results: 33% of the lmbench procs faster on icc, 66% faster on gcc.

Really???

If it is ture using icc 66% faster than gcc., It is wonderful.
Could you show us detail data to lmbench results.

Thanks!!

Norihiko



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