おまえの hddparm -tT 教えてください。

おまえの hddparm -tT ..

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22:名無しさん＠Ｅｍａｃｓ
 01/10/11 00:33 wmItvH/Q
-T 
Perform timings of cache reads for benchmark and comparison 
purposes. For meaningful results, this operation should be repeated 
2-3 times on an otherwise inactive system (no other active processes) 
with at least a couple of megabytes of free memory. This displays the 
speed of reading directly from the Linux buffer cache without disk 
access. This measurement is essentially an indication of the 
throughput of the processor, cache, and memory of the system under 
test. If the -t flag is also specified, then a correction factor based 
on the outcome of -T will be incorporated into the result reported for 
the -t operation. 
 
-t 
Perform timings of device reads for benchmark and comparison purposes. 
For meaningful results, this operation should be repeated 2-3 times on 
an otherwise inactive system (no other active processes) with at least 
a couple of megabytes of free memory. This displays the speed of 
reading through the buffer cache to the disk without any prior caching 
of data. This measurement is an indication of how fast the drive can 
sustain sequential data reads under Linux, without any filesystem 
overhead. To ensure accurate measurments, the buffer cache is flushed 
during the processing of -t using the BLKFLSBUF ioctl. If the -T flag 
is also specified, then a correction factor based on the outcome of -T 
will be incorporated into the result reported for the -t operation.

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