Gentoo Archives: gentoo-user

From: Grant <emailgrant@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] {OT} USB 3.0 hard drive speed test
Date: Thu, 18 Aug 2011 19:48:07
Message-Id: CAN0CFw2aGtqRRjmB682DaoQNSZDuTMwtpnc3X0nHivrkYy5QKA@mail.gmail.com
In Reply to: Re: [gentoo-user] {OT} USB 3.0 hard drive speed test by Grant
1 >>> I'm testing this USB 3.0 bus-powered hard drive:
2 >>>
3 >>> http://www.amazon.com/gp/product/B0041OSQ9S
4 >>>
5 >>> and I get:
6 >>>
7 >>> # hdparm -tT /dev/sdb
8 >>> /dev/sdb:
9 >>> Timing cached reads:   8006 MB in  2.00 seconds = 4004.33 MB/sec
10 >>> Timing buffered disk reads: 252 MB in  3.01 seconds =  83.63 MB/sec
11 >>>
12 >>> # hdparm -tT /dev/sdb
13 >>> /dev/sdb:
14 >>> Timing cached reads:   8230 MB in  2.00 seconds = 4116.54 MB/sec
15 >>> Timing buffered disk reads: 252 MB in  3.02 seconds =  83.55 MB/sec
16 >>>
17 >>> # hdparm -tT /dev/sdb
18 >>> /dev/sdb:
19 >>> Timing cached reads:   8446 MB in  2.00 seconds = 4224.36 MB/sec
20 >>> Timing buffered disk reads: 230 MB in  3.02 seconds =  76.28 MB/sec
21 >>>
22 >>> Wikipedia says USB 3.0 has transmission speeds of up to 5 Gbit/s.
23 >>> Doesn't MB/sec denote mega*bytes* per second?
24 >> What usb3 is supported by Linux?  Is it a pci card?
25 >
26 > I'm on 2.6.39-hardened-r10 and I'm using this motherboard with onboard USB 3.0:
27 >
28 > http://www.newegg.com/Product/Product.aspx?Item=N82E16813128490
29
30 Just thought I'd mention that one of my USB 3.0 ports works and the
31 other doesn't. The non-working port lights up the USB drive but the
32 drive isn't picked up by the system in dmesg at all. I don't know if
33 this is a hardware or software issue.
34
35 - Grant
36
37 >
38 > - Grant

Replies

Subject Author
Re: [gentoo-user] {OT} USB 3.0 hard drive speed test Paul Hartman <paul.hartman+gentoo@×××××.com>