timex tar cBpf - insight | ( cd /var/tmp/t ; tar xBpf - )
Results for Origin200 R10000SC 180MHz (1MB L2):
CDROM Time Data Speed (m:ss) Rate 2X 32X 1:18 978 Table 41
Results for O2 R5000SC 200MHz (the 12X is the O2's internal CDROM):
CDROM Time Data Speed (m:ss) Rate 2X 4:46 267 12X 2:24 530 32X 1:48 706 Table 27
Results for Indigo2 250MHz R4400SC:
CDROM Time Data Speed (m:ss) Rate 2X 4:50 263 32X 1:48 706 Table 28
Results for Indy 200MHz R4400SC:
CDROM Time Data Speed (m:ss) Rate 2X 5:02 253 32X 2:03 620 Table 29
Results for Indy 133MHz R4600PC:
CDROM Time Data Speed (m:ss) Rate 2X 5:22 237 32X 3:24 374 Table 30
Results for Indy 100MHz R4600PC:
CDROM Time Data Speed (m:ss) Rate 2X 5:27 233 32X 3:26 370 Table 31
Compared to copying a single large file, the average transfer rate is clearly much reduced. So much so in fact that, when transferring many small files, a system can easily display an average transfer rate for a 32X CDROM which is lower than that given by a 2X CDROM for transferring a single large file. Thus, don't assume a fast CDROM is going to display a level of performance that's anywhere near its theoretical maximum - it all depends on the task in question.
Also, faster systems do proportionally better than slower systems when transferring lots of small files, ie. the better main CPU helps a lot in dealing with the file-creation overhead. Here are the summary tables:
Time Data (m:ss) Rate O2 R5000SC 200MHz 1MB: 4:46 267 Indigo2 250MHz R4400SC: 4:50 263 Indy 200MHz R4400SC: 5:02 253 Indy 133MHz R4600PC: 5:22 237 Indy 100MHz R4600PC: 5:27 233 Table 32: 2X CDROM Performance Copying many small files to disk.
Time Data (m:ss) Rate O2 R5000SC 200MHz 1MB: 1:48 706 Indigo2 250MHz R4400SC: 1:48 706 Indy 200MHz R4400SC: 2:03 620 Indy 133MHz R4600PC: 3:24 374 Indy 100MHz R4600PC: 3:26 370 Table 33: 32X CDROM Performance Copying many small files to disk.
Compare Table 33 to Table 22, and Table 32 to Table 21.