Hay Trevor, what would be the problem if you were using AMD processors?


Trevor Peirce wrote:

Hello,

Running Fedora Core 2 with a Celeron processor I'm seeing a significant problem when enabling MMX optimizations.

I'll gladly submit a bug report, but I don't know what information is useful.

First, with -no- MMX optimizations enabled, here is what I see

CLI> show translation
       Translation times between formats (in milliseconds)
        Source Format (Rows) Destination Format(Columns)

       g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
 g723     -     -     -     -     -     -     -     -     -     -     -
  gsm     -     -     2     2     3     2     1    11    18     -    24
 ulaw     -     5     -     1     3     2     1    11    18     -    24
 alaw     -     5     1     -     3     2     1    11    18     -    24
 g726     -     6     3     3     -     3     2    12    19     -    25
adpcm     -     5     2     2     3     -     1    11    18     -    24
 slin     -     4     1     1     2     1     -    10    17     -    23
lpc10     -     7     4     4     5     4     3     -    20     -    26
 g729     -     7     4     4     5     4     3    13     -     -    26
speex     -     -     -     -     -     -     -     -     -     -     -
 ilbc     -     8     5     5     6     5     4    14    21     -     -

If I enable MMX_OPTIMIZATIONS (and change nothing else), it gets quite worse....

CLI> show translation
       Translation times between formats (in milliseconds)
        Source Format (Rows) Destination Format(Columns)

       g723   gsm  ulaw  alaw  g726 adpcm  slin lpc10  g729 speex  ilbc
 g723     -     -     -     -     -     -     -     -     -     -     -
  gsm     -     -     2     2     3     2     1    48    20     - 446270
 ulaw     -     5     -     1     3     2     1    48    20     - 446270
 alaw     -     5     1     -     3     2     1    48    20     - 446270
 g726     -     6     3     3     -     3     2    49    21     - 446271
adpcm     -     5     2     2     3     -     1    48    20     - 446270
 slin     -     4     1     1     2     1     -    47    19     - 446269
lpc10     -   368   365   365   366   365   364     -   383     - 446633
 g729     -    23    20    20    21    20    19    66     -     - 446288
speex     -     -     -     -     -     -     -     -     -     -     -
 ilbc     -   266   263   263   264   263   262   309   281     -     -


And just incase you think I've got an AMD, here you go...


processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 1
model name : Intel(R) Celeron(R) CPU 1.70GHz
stepping : 3
cpu MHz : 1716.114
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 3399.68



If this isn't supposed to work with Celerons I'd like to update the documentation. On the other hand if it's a problem with my system I'd like to resolve it :)


TIA!
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