Results for May -
Having both the "System BIOS Cacheable" and "Video BIOS Cacheable" set to "OFF" seems to do the trick. Patched BIOS is now "officially" in beta testing at
Jan Steunebrink's "The Unofficial AMD K6-2+ / K6-III+ page".
Some interesting data from CacheMem -
Cache size/Memory speed info tool 2.65MMX - (c) 1999-2001, LRMS - DJGPP compiled
CPUID support detected... 'AuthenticAMD' with FPU TSC MMX
Family=5 Model=13 Step=4 Type=0 Chipset (Vendor/Device ID(Rev)): Intel/7030(02)
CPU clock: 398.9 MHz
Using 32MB physical memory block (alignment = 32)
Bandwidth - MMX linear access test... Read/Write/Copy (MB/s)
Block of 1KB: 3042.5 / 3042.4 / 4645.4
Block of 2KB: 2972.8 / 2972.9 / 4790.3
Block of 4KB: 3007.3 / 3007.2 / 4807.1
Block of 8KB: 3024.9 / 3024.9 / 4829.0
Block of 16KB: 3033.7 / 3033.7 / 4368.6
Block of 32KB: 2987.7 / 2941.1 / 1011.3
Block of 64KB: 1520.2 / 1013.5 / 999.5
Block of 128KB: 1506.9 / 1007.2 / 218.2
Block of 256KB: 336.5 / 146.8 / 218.2
Block of 512KB: 336.4 / 146.8 / 118.2
Block of 1024KB: 181.6 / 84.2 / 110.8
Block of 2048KB: 159.5 / 76.0 / 104.4
Block of 4096KB: 150.4 / 72.5 / 101.4
Block of 8192KB: 146.2 / 70.8 / 100.0
Block of 16384KB: 144.2 / 70.1 / 99.4
Block of 32768KB: 143.3 / 69.7
Latency - Memory walk tests... ("pointer chasing")
Null size: 2 cycles 1 cycles (overhead 41 cycles)
steps: 4 8 16 32 64 128 256 512 1k 2k 4k (bytes)
Block of 1KB: 2 2 2 2 2 2 2 2 - - - cycles
Block of 2KB: 1 2 2 2 2 2 2 2 2 - - cycles
Block of 4KB: 1 2 2 2 2 2 2 2 2 2 - cycles
Block of 8KB: 1 2 2 2 2 2 2 2 2 2 2 cycles
Block of 16KB: 1 2 2 2 2 2 2 2 2 2 2 cycles
Block of 32KB: 1 2 2 2 2 2 2 2 2 2 2 cycles
Block of 64KB: 2 3 6 12 24 24 23 23 23 23 23 cycles
Block of 128KB: 3 3 6 12 23 23 22 23 23 23 23 cycles
Block of 256KB: 6 9 18 36 72 72 72 72 72 72 72 cycles
Block of 512KB: 9 9 18 36 72 72 72 72 72 72 72 cycles
Block of 1024KB: 13 21 42 73 106 126 133 133 133 133 134 cycles
Block of 2048KB: 12 21 43 72 105 149 147 150 151 152 152 cycles
Block of 4096KB: 12 21 42 74 107 149 155 159 161 161 161 cycles
Block of 8192KB: 14 21 42 74 107 149 163 163 165 165 166 cycles
Block of 16384KB: 15 21 42 74 107 149 163 167 167 168 168 cycles
Block of 32768KB: 15 21 42 74 107 149 163 167 169 169 169 cycles
This system appears to have 3 cache levels (enabled).
L1 cache (32KB) speed (MB/s): Read=3033.7, Write=3033.7
L2 cache (128KB) speed (MB/s): Read=1520.2, Write=1013.5
L3 cache (512KB) speed (MB/s): Read=336.5, Write=146.8
Main memory speed (MB/s): Read=144.2, Write=70.1
Latency Summary: CPU Clocks: 2/23/72/166 Bus Corrected: 2/23/12/27.5