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TweakingHardDiskPerformanceTesting disk performance hdparm provides a command line interface to various hard disk ioctls supported by the stock Linux ATA/IDE device driver subsystem. # hdparm -tT /dev/hda To tweak, you can use any of the following examples (or experiment yourself) which use /dev/hda as disk (substitute with your disk): Tweaking hard disk performance Activate DMA: # hdparm -d 1 /dev/hda
Activate Safe Performance Options: # hdparm -d 1 -A 1 -m 16 -u 1 -a 64 /dev/hda
-T Perform timings of cache reads for benchmark and comparison pur-
poses. 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 mea-
surement is an indication of how fast the drive can sustain
sequential data reads under Linux, without any filesystem over-
head.
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