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From: David Zaffiro <DavZaffiro@tasking.nl>
To: "Martin J. Bligh" <mbligh@aracnet.com>
Cc: Keith Owens <kaos@ocs.com.au>, linux-kernel@vger.kernel.org
Subject: Re: Compiling x86 with and without frame pointer
Date: Mon, 25 Nov 2002 09:59:17 +0100	[thread overview]
Message-ID: <3DE1E665.1060907@netscape.net._> (raw)
In-Reply-To: <224900000.1037900678@flay>

> I looked at 2.5.47 (with a splattering of performance patches) using 
> gcc 2.95.4 (Debian Woody), on a 16-way NUMA-Q, and did some kernel
> compile testing. The times to do the tests were almost identical
> (within error noise), but the kernel was indeed smaller
> 
>    text    data     bss     dec     hex filename
> 1873293  396231  459388 2728912  29a3d0 2.5.47-mjb1/vmlinux
> 1427355  396875  455356 2279586  22c8a2 2.5.47-mjb1-frameptr/vmlinux
> 

I can't think of any reason why the data- and bss-part of the kernel are 
influenced by a framepointer option, this seems highly illogical. It 
shouldn't make any difference as far as I can tell, maybe you altered 
other options as well? (Could be strange compilerbehaviour though)

Keith's results seem more reliable:

# size 2.4.20-rc2-*/vmlinux
    text    data     bss     dec     hex filename
2669584  337972  402697 3410253  34094d 2.4.20-rc2-fp/vmlinux
2676919  337972  402697 3417588  3425f4 2.4.20-rc2-nofp/vmlinux


      parent reply	other threads:[~2002-11-25  8:53 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-11-21  4:47 Keith Owens
2002-11-21  5:06 ` Mark Mielke
2002-11-21  9:30   ` David Zaffiro
2002-11-21 19:20     ` Willy Tarreau
2002-11-21 19:32       ` Doug Ledford
2002-11-21 19:41         ` Willy Tarreau
2002-11-21 20:00           ` Doug Ledford
2002-11-25  8:47       ` David Zaffiro
2002-11-25  8:52         ` Willy Tarreau
2002-11-25 14:55           ` Denis Vlasenko
2002-11-25 15:00         ` Denis Vlasenko
2002-11-25 11:57           ` David Zaffiro
2002-11-21 12:55 ` Dave Jones
2002-11-21 14:46   ` Alan Cox
2002-11-21 17:44 ` Martin J. Bligh
2002-11-21 23:47   ` Rudmer van Dijk
2002-11-25  8:59   ` David Zaffiro [this message]

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