Could you run the same test with an HDD? I bet its the disk controller ... or more precisely, the driver that drives it. FreeBSD prints out the read/write speed of each disk on dmesg. Can you check this on Linux somewhere?
EDIT:
Oh you did. Yeah it's the controller. Try to find out what the reported read/write speed is.
EDIT:
Oh you did. Yeah it's the controller. Try to find out what the reported read/write speed is.
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