timex cp pak0.pak /var/tmp
Results for Origin200 R10000SC 180MHz (1MB L2):
CDROM Time Data Speed (m:ss) Rate 2X 32X 1:15 2396 Table 40
Results for O2 R5000SC 200MHz (the 12X is the O2's internal CDROM):
CDROM Time Data Speed (m:ss) Rate 2X 5:01 597 12X 3:22 890 32X 2:30 1198 Table 16
Results for Indigo2 250MHz R4400SC:
CDROM Time Data Speed (m:ss) Rate 2X 4:59 601 32X 1:34 1912 Table 17
Results for Indy 200MHz R4400SC:
CDROM Time Data Speed (m:ss) Rate 2X 5:59 501 32X 2:30 1198 Table 18
Results for Indy 133MHz R4600PC:
CDROM Time Data Speed (m:ss) Rate 2X 6:47 442 32X 4:35 653 Table 19
Results for Indy 100MHz R4600PC:
CDROM Time Data Speed (m:ss) Rate 2X 6:58 430 32X 4:27 673 Table 20
As shown in CDROM TEST 1, Tables 19 and 20 prove that a faster CDROM for a system with a slow CPU is barely worth the expense. But far more interesting are the following two observations:
My theory is this: copying a file from a CDROM merely involves getting the data as fast as possible through the main CPU, ie. into the registers, out to the disk (loads and stores). These operations usually only take a single clock cycle. Thus, the design of the CPU won't affect how quickly the data is copied, ie. it's the raw clock speed that matters, assuming the CPU is of the type which does the generic 1 int operation per clock tick. This is why the Indy R4400SC/200 copied the file in exactly the same amount of time as the O2 R5000SC/200 (for the 32X CDROM) - the two CPUs run at the same clock speed. On the other hand, tasks like installing software require the CPU to process the incoming data in some way. How well the CPUs do this depends on their design, so the R5000 performs better. Well, that's my theory anyway.
Tables 21 and 22 show the data from tables 16 to 20 reorganised to show the performance for each CDROM type separately (the 12X results for O2 have been excluded).
Time Data (m:ss) Rate Indigo2 250MHz R4400SC: 4:59 601 O2 R5000SC 200MHz 1MB: 5:01 597 Indy 200MHz R4400SC: 5:59 501 Indy 133MHz R4600PC: 6:47 442 Indy 100MHz R4600PC: 6:58 430 Table 21: 2X CDROM Performance Copying a large file to disk.
Time Data (m:ss) Rate Indigo2 250MHz R4400SC: 1:34 1912 O2 R5000SC 200MHz 1MB: 2:30 1198 Indy 200MHz R4400SC: 2:30 1198 Indy 133MHz R4600PC: 4:35 653 Indy 100MHz R4600PC: 4:27 673 Table 22: 32X CDROM Performance Copying a large file to disk.