[mythtv-users] configure did not detect my cpu

Michael Still mikal at stillhq.com
Tue Jan 16 00:59:01 UTC 2007

Daniel Kristjansson wrote:
> On Thu, 2007-01-11 at 16:07 -0700, John P Poet wrote:
>> On 1/11/07, Daniel Kristjansson <danielk at cuymedia.net> wrote:
>>         On Wed, 2007-01-10 at 18:45 -0800, mikal at stillhq.com wrote:
>>         > Just doing what I am told (a search implies no one else has
>>         sent this in
>>         > yet)...
>>         This CPU is in SVN head.. 
>>         -- Daniel
>> Hi Daniel,
>> I assume you have seen this:
>> http://psykil.livejournal.com/2006/12/03/
>> I don't have a core cpu, but would love to get one... 
> No I hadn't seen that. It might be worth it to add a gcc 4.2
> check just for the "-march=native". We actually limit the
> CPU's we optimize for to avoid compiler bugs mucking up trac.
> I did some timing studies before adding "--enable-proc-opt"
> and with MythTV the only thing that sped things up
> significantly was compiling for a cmov capable processor,
> i.e. PentiumPro or later.
> Compiling for the P4 gave and extra 10% so we do that too.
> Finally, "-mfpmath=sse" added another 10% speedup, but it
> didn't caused problems so it's not used when you use
> "--enable-proc-opt".
> We don't compile specifically for any Athlon processor
> unless the architecture demands it because those flags
> actually slow down the executable..

I have access to this hardware (the Intel Core2 Duo) for another week or 
so (it's for a demo). Are there any tests which I could run which would 
help out with this decision?


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