Re: Locking comment on shrink_caches()

[Padraig Brady <padraig@antefacto.com>]

Dave Jones wrote:

>On Wed, 26 Sep 2001, Alan Cox wrote:
>
>>VIA Cyrix CIII (original generation 0.18u)
>>
>>nothing: 28 cycles
>>locked add: 29 cycles
>>cpuid: 72 cycles
>>
>
>Interesting. From a newer C3..
>
>nothing: 30 cycles
>locked add: 31 cycles
>cpuid: 79 cycles
>
>Only slightly worse, but I'd not expected this.
>This was from a 866MHz part too, whereas you have a 533 iirc ?
>
>regards,
>
>Dave.
>
Interesting, does the origonal CIII have a TSC? would that affect the 
timings Alan got?

The following table may  be of use to people:

(All these S370)
----------------------------------------------------------------------------------------
core        size    name        code    Notes
----------------------------------------------------------------------------------------
samuel        0.18µm    Via Cyrix III(C5)   (128K L1 0K L2 cache). FPU 
doesn't run @ full clock speed.
samuel II    0.15µm    Via C3        (C5B)   667MHz CIII in Dabs are 
C3's (128K L1, 64K L2 cache), (MMX/3D now!), FPU @ full clock speed.
mathew      0.15µm    Via C3        (C5B)   mobile samuel II with 
integrated north bridge & 2D/3D graphics. (1.6v)
ezra        0.13µm    Via C3        (C5C)   Debut @ 850MHz rising to 
1GHz quickly (1.35v)
nehemiah    0.13µm    Via C4        (C5X)   Debut @ 1.2GHz (128K L1, 
256K L2 cache) (SSE)
esther        0.10µm    Via C4        (C5Y)   ?

----------------------

C3 availability details:
667    66 / 100 / 133    1.5    Socket 370    L1: 128kB,L2: 64kB    
0.15µ    6-12W    Mar 2001
733    66 / 100 / 133    1.5    Socket 370    L1: 128kB,L2: 64kB    
0.15µ    6-12W    May 2001
733    66 / 100 / 133    1.5    Socket 370    L1: 128kB,L2: 64kB    
0.15µ    1+ W    May 2001 (e series)
750    100 / 133    1.5    Socket 370    L1: 128kB,L2: 64kB    0.15µ    
6-12W    May 2001
800    100 / 133    1.5    Socket 370    L1: 128kB,L2: 64kB    0.13µ    
7-12W    May 2001 (ezra)

----------------------