Andy Burns wrote:
Now I'm scratching my head too,
OK, having looked at hdparm man page for -T
"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."
I always though -T just repeatedly read one sectore from disk's on baord
cache repeatedly, clearly I have always been wrong, that is what "-t"
does :-(
I thought "-t" read a file large enough to overflow the onboard disk
cache, so actually I'm pleased my dmrebuild test does actually give the
same speed.
And the difference in your 2228MB/s, my 4456MB/s and your friends
1800MB/s are down to motherboard/cpu/memory, mine is P4 630 with dual
DDR2 667MHz
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