On Fri, Aug 29, 2003 at 06:35:10AM +0100, Jamie Lokier wrote:
> I'd appreciate if folks would run the program below on various
> machines, especially those whose caches aren't automatically coherent
> at the hardware level.
>
sh (VIPT cache):

Test separation: 4096 bytes: FAIL - cache not coherent
Test separation: 8192 bytes: FAIL - cache not coherent
Test separation: 16384 bytes: pass
Test separation: 32768 bytes: pass
Test separation: 65536 bytes: pass
Test separation: 131072 bytes: pass
Test separation: 262144 bytes: pass
Test separation: 524288 bytes: pass
Test separation: 1048576 bytes: pass
Test separation: 2097152 bytes: pass
Test separation: 4194304 bytes: pass
Test separation: 8388608 bytes: pass
Test separation: 16777216 bytes: pass
VM page alias coherency test: minimum fast spacing: 16384 (4 pages)

$ cat /proc/cpuinfo
machine         : Sega Dreamcast
processor       : 0
cpu family      : sh4
cpu type        : SH7750
cache size      : 8K-bytes/16K-bytes
bogomips        : 199.06
cpu clock       : 199.49MHz
bus clock       : 99.74MHz
module clock    : 49.87MHz

and on sh64 (which is sort of VIPT/VIVT, as it looks at physical tags if
there's no match on virtual):

Test separation: 4096 bytes: FAIL - cache not coherent
Test separation: 8192 bytes: pass
Test separation: 16384 bytes: pass
Test separation: 32768 bytes: pass
Test separation: 65536 bytes: pass
Test separation: 131072 bytes: pass
Test separation: 262144 bytes: pass
Test separation: 524288 bytes: pass
Test separation: 1048576 bytes: pass
Test separation: 2097152 bytes: pass
Test separation: 4194304 bytes: pass
Test separation: 8388608 bytes: pass
Test separation: 16777216 bytes: pass
VM page alias coherency test: minimum fast spacing: 8192 (2 pages)

-sh-2.05b$ cat /proc/cpuinfo
machine         : Hitachi Cayman
processor       : 0
cpu family      : SH-5
cpu type        : SH5-101
icache size     : 32K-bytes
dcache size     : 32K-bytes
itlb entries    : 64
dtlb entries    : 64
cpu clock       : 314.73MHz
bus clock       : 157.36MHz
module clock    : 26.22MHz
bogomips        : 313.75