Re: [gentoo-user] {OT} USB 3.0 hard drive speed test

[Grant <emailgrant@gmail.com>]

>>> I'm testing this USB 3.0 bus-powered hard drive:
>>>
>>> http://www.amazon.com/gp/product/B0041OSQ9S
>>>
>>> and I get:
>>>
>>> # hdparm -tT /dev/sdb
>>> /dev/sdb:
>>> Timing cached reads:   8006 MB in  2.00 seconds = 4004.33 MB/sec
>>> Timing buffered disk reads: 252 MB in  3.01 seconds =  83.63 MB/sec
>>>
>>> # hdparm -tT /dev/sdb
>>> /dev/sdb:
>>> Timing cached reads:   8230 MB in  2.00 seconds = 4116.54 MB/sec
>>> Timing buffered disk reads: 252 MB in  3.02 seconds =  83.55 MB/sec
>>>
>>> # hdparm -tT /dev/sdb
>>> /dev/sdb:
>>> Timing cached reads:   8446 MB in  2.00 seconds = 4224.36 MB/sec
>>> Timing buffered disk reads: 230 MB in  3.02 seconds =  76.28 MB/sec
>>>
>>> Wikipedia says USB 3.0 has transmission speeds of up to 5 Gbit/s.
>>> Doesn't MB/sec denote mega*bytes* per second?
>> What usb3 is supported by Linux?  Is it a pci card?
>
> I'm on 2.6.39-hardened-r10 and I'm using this motherboard with onboard USB 3.0:
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16813128490

Just thought I'd mention that one of my USB 3.0 ports works and the
other doesn't.  The non-working port lights up the USB drive but the
drive isn't picked up by the system in dmesg at all.  I don't know if
this is a hardware or software issue.

- Grant

>
> - Grant