linux-kernel - Re: Possibility of adding -march=native to x86

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Message-ID: <472112EA.3020604@zytor.com>
Date:	Thu, 25 Oct 2007 15:04:26 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Adrian Bunk <bunk@...nel.org>
CC:	Michael Lothian <mike@...eburn.co.uk>,
	Gabriel C <nix.or.die@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Possibility of adding -march=native to x86

Adrian Bunk wrote:
>>>
>> Yes for something like a distro kernel it is bad but as I said before
>> this isn't what this is for.
>>
>> Eventually it would be nice to to a make localkernel and for a
>> customised kernel to be build compiling in all pci / pci express
>> drivers into the kernel and all usb devices as modules.
>>
>> Auto magically detecting the cpu would be part of that
>>
>> I hate getting a new piece of kit and then have to figure out from
>> lspci which options need to be turned on and the the really iritation
>> part of finding the option in make menuconfig
> 
> What exactly is irritating?
> Please name the problems so that they can be fixed.
> 
>> Detecting the cpu and using march=native could be all part of that
> 
> You don't need march=native for this.
> 
> You have to set the right config option for your CPU and you 
> automatically get the right compiler options.
> 

There was a long discussion years ago -- the infamous "Aunt Tillie" 
thread -- about automatically configuring customized kernels for 
specific hardware.

It's somewhat of an unusual thing to bother with these days, except for 
people who develop and maintain the kernel.

	-hpa
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