Apparently the driver throttles the disk back to PIO0 eventually...
quite unusable.

I have also spotted some different errors:

[13873.934590] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[13873.934684] ata3.00: failed command: READ MULTIPLE
[13873.934789] ata3.00: cmd c4/00:08:90:d3:eb/00:00:00:00:00/e6 tag 0 pio 4096 
in
[13873.934804]          res 58/00:07:91:d3:eb/84:01:06:00:00/e6 Emask 0x2 (HSM 
violation)
[13873.934957] ata3.00: status: { DRDY DRQ }
[13873.935027] ata3: soft resetting link
[13874.105263] ata3.00: configured for PIO0
[13874.105335] ata3: EH complete
[13874.114626] ata3: drained 65536 bytes to clear DRQ.
[13874.174559] ata3.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[13874.174652] ata3.00: failed command: READ MULTIPLE
[13874.174756] ata3.00: cmd c4/00:08:90:d3:eb/00:00:00:00:00/e6 tag 0 pio 4096 
in
[13874.174772]          res 58/00:07:91:d3:eb/84:01:06:00:00/e6 Emask 0x2 (HSM 
violation)
[13874.174924] ata3.00: status: { DRDY DRQ }
[13874.174995] ata3: soft resetting link
[13874.345499] ata3.00: configured for PIO0
[13874.345571] ata3: EH complete

-- 
sata-via: read errors, slowdowns with VIA VT6420
https://bugs.launchpad.net/bugs/676644
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