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From: Andrey Panin <pazke@orbita1.ru>
To: Mark Hahn <hahn@physics.mcmaster.ca>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [ACPI] ACPI mentioned on lwn.net/kernel
Date: Wed, 30 Jan 2002 11:00:25 +0300	[thread overview]
Message-ID: <20020130110025.A251@pazke.ipt> (raw)
In-Reply-To: <20020130122200.A254@pazke.ipt> <Pine.LNX.4.33.0201291412590.18804-100000@coffee.psychology.mcmaster.ca>
In-Reply-To: <Pine.LNX.4.33.0201291412590.18804-100000@coffee.psychology.mcmaster.ca>; from hahn@physics.mcmaster.ca on Tue, Jan 29, 2002 at 02:14:32PM -0500

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On Tue, Jan 29, 2002 at 02:14:32PM -0500, Mark Hahn wrote:
> > 	- what stop us from using -mregparm=3 gcc switch ?
> 
> I dimly recall that it can generage bad code, perhaps only
> on old compilers.

Bad code, hmm ... slow code or wrong code ?
IIRC gcc 2.95.3 declared as minimal requirement for kernel compilation,
so may be it's not an issue anymore ?

> 
> > 	- same with -Os -malign-loops=1 -malign-jumps=1 ?
> 
> 2 is probably always the lowest you should go, and indeed,
> I think that's all the compiler permits.
>

gcc (at least 2.95.2) permits 1, but i didn't check generated code.

> > 	- any tool to measure perfomance gain/penalty of above ?
> 
> lmbench.  it has to be a microbenchmark to measure this sort of thing,
> though a sanity check (kernel compile) would also be useful.

Thanks, i'll test these issues this weekend. 

Best regards.

-- 
Andrey Panin            | Embedded systems software engineer
pazke@orbita1.ru        | PGP key: wwwkeys.eu.pgp.net

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  parent reply	other threads:[~2002-01-30  7:58 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-01-25 15:42 [ACPI] ACPI mentioned on lwn.net/kernel Moore, Robert
2002-01-25 15:50 ` Horst von Brand
2002-01-25 16:02   ` Ryan Cumming
2002-01-25 16:15     ` Andreas Schwab
2002-01-25 20:05       ` Ryan Cumming
2002-01-26  1:00       ` Linus Torvalds
2002-01-26  3:41         ` Jamie Lokier
2002-01-26 16:39           ` Martin Eriksson
2002-01-26 16:47             ` Jeff Garzik
2002-01-26 17:48               ` Jamie Lokier
2002-01-26 18:25                 ` Martin Eriksson
2002-01-26 21:42             ` Linus Torvalds
2002-01-30  9:22               ` Andrey Panin
     [not found]                 ` <Pine.LNX.4.33.0201291412590.18804-100000@coffee.psychology.mcmaster.ca>
2002-01-30  8:00                   ` Andrey Panin [this message]
2002-01-26 17:33         ` Felix von Leitner
2002-01-26 19:40           ` Florian Weimer
2002-01-27 13:56         ` Martin Dalecki
  -- strict thread matches above, loose matches on Subject: below --
2002-01-27 23:58 Dieter Nützel
     [not found] <200201251550.g0PFoIPa002738@tigger.cs.uni-dortmund.de.suse.lists.linux.kernel>
     [not found] ` <200201250802.32508.bodnar42@phalynx.dhs.org.suse.lists.linux.kernel>
     [not found]   ` <jeelkes8y5.fsf@sykes.suse.de.suse.lists.linux.kernel>
     [not found]     ` <a2sv2s$ge3$1@penguin.transmeta.com.suse.lists.linux.kernel>
     [not found]       ` <20020126034106.F5730@kushida.apsleyroad.org.suse.lists.linux.kernel>
     [not found]         ` <012d01c1a687$faa11120$0201a8c0@HOMER.suse.lists.linux.kernel>
2002-01-26 22:43           ` Andi Kleen
     [not found] <fa.juevf8v.1u7ubb8@ifi.uio.no>
     [not found] ` <fa.h3u09pv.1v2k3bm@ifi.uio.no>
2002-01-26  2:12   ` Dan Maas
2002-01-26  3:45     ` Jamie Lokier
2002-01-26  4:33       ` Alexander Viro
2002-01-26  4:38         ` Andrew Pimlott
2002-01-26  4:59           ` Jamie Lokier
2002-01-26  5:11         ` Jamie Lokier
2002-01-25  2:15 Therien, Guy

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