On 2024-11-17 14:32, Felix Miata wrote:
Stephen Morris composed on 2024-11-18 09:07 (UTC+1100):
For me on my hard disk its giving:
/dev/sdd:
Timing cached reads: 52114 MB in 1.99 seconds = 26165.57 MB/sec
Timing buffered disk reads: 492 MB in 3.01 seconds = 163.69 MB/sec
and on my SSD it is giving:
/dev/sdc:
Timing cached reads: 52352 MB in 1.99 seconds = 26285.62 MB/sec
Timing buffered disk reads: 1498 MB in 3.00 seconds = 498.96 MB/sec
Try it on individual partitions and you may see more than trivial variation.
What trivial variation are you seeing. The non-cached reads are going
to be maxing out the SATA connection with the SSD.
# hdparm -t /dev/nvme0n1
/dev/nvme0n1:
Timing buffered disk reads: 2872 MB in 3.00 seconds = 957.06 MB/sec
# hdparm -t /dev/sdb
/dev/sdb:
Timing buffered disk reads: 436 MB in 3.00 seconds = 145.19 MB/sec
# hdparm -t /dev/nvme0n1p8
/dev/nvme0n1p8:
Timing buffered disk reads: 3652 MB in 3.00 seconds = 1216.79 MB/sec
# hdparm -t /dev/sdb7
/dev/sdb7:
Timing buffered disk reads: 440 MB in 3.01 seconds = 146.41 MB/sec
# hdparm -t /dev/nvme0n1p7
/dev/nvme0n1p7:
Timing buffered disk reads: 3056 MB in 3.00 seconds = 1018.60 MB/sec
# hdparm -t /dev/sdb8
/dev/sdb8:
Timing buffered disk reads: 434 MB in 3.00 seconds = 144.51 MB/sec
#
You have an nvme drive, so it's not going over SATA and will be much
faster than a regular SSD. The variations in your measurements are just
noise.
--
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