#3787: make ATLAS use extended cpuid
----------------------+-----------------------------------------------------
Reporter: mabshoff | Owner: mabshoff
Type: defect | Status: assigned
Priority: blocker | Milestone: sage-3.4
Component: build | Resolution:
Keywords: |
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Comment (by mabshoff):
The latest errata is the following:
{{{
To fix this, simply comment out lines 95 and 99 of
ATLAS/CONFIG/src/backend
/archinfo_x86.c. So, change line 95 from:
if (*family == 0xf || *family == 0) /* extended family is added in */
to:
/* if (*family == 0xf || *family == 0)*/ /* extended family is added in */
and change line 99 from
if (*model == 0xf) /* extended model is concatenated
*/
to:
/* if (*model == 0xf)*/ /* extended model is concatenated
*/
Essentially, all the Core2-based systems are treated the same by ATLAS.
So,
to get to use the architectural defaults on Core2-based XEONs, change line
297 from:
case 15:
to:
case 15: ; case 23:
Finally, to enable better P4E identification, change line 313 from:
case 4:
to:
case 4: ; case 6:
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/3787#comment:5>
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