021005-3 - Cyrix and Lacuna Part 3
Episode 3: Return of The Jedi... M.A.D?
In order to find out Cyrix 5x86 x4 100 model and ACE486 interposer in stock
condition, I opened every PS/55s and PS/2s. Cyrix 5x86 100GP x4 capable model
was in 9585 together with a PGA DX4. A stock ACE486 was in 8590/Type-1 25MHz
complex with a Cyrix 120GP. Now, it's time to test Cyrix 5x86 100GP/4.
9577-BTG 33MHz planar
Hard Drive: EIDE Quantum Fireball ST, 2160AT
CD-ROM: Toshiba XM3401BMA 2.1x speed off from IBM SCSI II (OEM'ed FD MCS-700)
RAM: 8MB x4
Resolution: 800x600, 65K color depth
OS: OS/2 Warp 3 Connect, NO FIX Pack applied yet.
File system: FAT
Test result of SysBench 0.9.4g.
Upper five lines are took from previous page for reference.
|Cyrix 5x86 3x *1
|Cyrix 5x86 4x ET *3
|Cyrix 5x86 4x ET *5
|AMD 5x86 4x PL586 *7
|5x86 120GP x3 on ACE486 (x3 fixed interposer) Designed for intel DX4-100|
|Cyrix 5x86 3x ET *8
|Cyrix 5x86 3x ET *9
|Cyrix 5x86 3x ET *10
|Cyrix 5x86 3x ET *11
|My favorite 5x86 100GP x4 on EverGreen586 Interposer|
|Cyrix 5x86 4x ET *10
|Cyrix 5x86 4x ET *11
|Cyrix 5x86 4x ET *12
|Cyrix 5x86 4x ET *13
ET means cache driver et586OS2.sys from
et9603.exe is used.
EverGreen 586 Interposer is used for *1, *3, *5. CB jumper on.
PowerLeap PL586 Interposer is used for *7. WB jumper on.
*1 Cache driver not used
*3 Cache driver setting: default (/CCR4=1D)
*5 Cache driver setting: /CCR2=56 /CCR4=1D /WBE (worked fine on 5551-R and Win98)
*7 AMD 5x86/PGA on PowerLeap PL586 on an 486 socket interposer (like the one for PODP)
*8 Cache driver setting: /CCR4=1D
*9 Cache driver setting: /CCR2=16 /CCR4=1D /WBE
*10 Cache driver setting: /CCR2=56 /CCR4=1D /WBE
*11 Cache driver setting: /CCR2=56 /CCR4=1D (/CBE makes no difference)
*12 Cache driver setting: /CCR2=16 /CCR4=38
*13 Cache driver setting: /CCR2=16 /CCR4=38 /WBE
*3, *5 are tested with 5x86 133MHz/4x model.
Under DOS environment, default values for Lacuna planar with Cyrix
5x86/EverGreen 586 Interposer set to 4x speed are:
PCR0=0 CCR1=0 CCR2=0 CCR3=10 CCR4=05 SMR1 thru 2=0 PMR=2 DIR0=2C DIR1=5
/CCR3 and /PMR are probably not allowed for the OS/2 driver.
/WBE improves CPU Integer and Floating point scores dramatically but at
the same time it decreases video and disk access performance.
Not suitable switches are:
Don't know how "/CBE" works. /WBE means Write-back cache Enabled.
Tired and exhausted!
I may say:
- Cyrix 5x86 series is not good at DISK I/O on SysBench.exe, I don't know if
Cyrix is really so bad at Disk Access on every bench program and on usual
usage for daily job.
- Video performance is one of weak points of Cyrix CPU.
- It's difficult to determine *good* sw parameter for register setting.
By the way 5x86 100GP x4 model marked 85.300 for Dhrystone in CPU Integer
test. Don't you think it's astonishing?
As far as OS/2 and Sysbench concerns, it seems that 4x models rated 133MHz
and 100MHz are almost same.
And in the end, I don't want to say but if I trust the result then AMD
5x86-133/ADZ in PGA package may be a one to take for OS/2 on Lacuna. No need
to hustle to get appropriate cache driver setting.
But how do you consider following scores? Here is Today's Final Result for
usual Cyrix 5x86 100GP 3x speed model. I think I probably succeeded.
CPU: Cyrix 5x86 100GP 3x speed model
Interposer: ACE486 designed for intel DX4-100, no jumpers no switches. Fixed to
Cache Enabler statement: Device=C:\ETI\ET586OS2.SYS /CCR2=16
The statement is exactly same with *13 above used for 5x86 133GP
in 4x multiplication, but the result for 3x model is very different from that
of 4x model as shown below.
ET586OS2 .sys should be added at the bottom of config.sys (for OS/2 only.
Not for DOS/Win9x)
*1 Executed the program twice to confirm above result.
|Intel 486DX4-100 3x
|Cyrix 5x86 100GP 3x
|2nd execution *1
|Cyrix 5x86 w/o driver
|IBM 5x86 100 3x *2
*2 Added just for confirmation. Same statement was used. Tested on 2002.10.26
George Albus finally got following result with his Lacuna 25 MHz planar
using the same driver arguments as mine (/CCR2=16 /CCR4=38 /WBE).
Integer and FP are improved a lot. DIVE is a bit behind the DX4-100. PM and
Disk I/O are both almost the same with DX4-100.The et586OS2.sys driver really
brought out some hidden abilities of the Cyrix CPU. Don't you think?
|Cyrix 5x86 No Driver
|Cyrix 5x86 et5x86OS2
But let's see his comment about a disadvantage of the driver:
"Only thing is, I lost the Ctrl-Alt-Del function :-("
I have no clue for this symptom. Don't know if another HEX value could
solve it or not.