From mboxrd@z Thu Jan 1 00:00:00 1970
Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org)
by finch.gentoo.org with esmtp (Exim 4.60)
(envelope-from <gentoo-user+bounces-126739-garchives=archives.gentoo.org@lists.gentoo.org>)
id 1QrZ4E-0007D3-Fb
for garchives@archives.gentoo.org; Thu, 11 Aug 2011 17:29:14 +0000
Received: from pigeon.gentoo.org (localhost [127.0.0.1])
by pigeon.gentoo.org (Postfix) with SMTP id 0741D21C0DD;
Thu, 11 Aug 2011 17:28:59 +0000 (UTC)
Received: from mail0101.smtp25.com (mail0101.smtp25.com [67.228.8.101])
by pigeon.gentoo.org (Postfix) with ESMTP id B260F21C0B1
for <gentoo-user@lists.gentoo.org>; Thu, 11 Aug 2011 17:27:55 +0000 (UTC)
Received: from ccs.covici.com (localhost [127.0.0.1])
by ccs.covici.com (8.14.5/8.14.4) with ESMTP id p7BHRo6d032549
for <gentoo-user@lists.gentoo.org>; Thu, 11 Aug 2011 13:27:53 -0400
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] {OT} USB 3.0 hard drive speed test
In-reply-to: <CAN0CFw3t38cN76gxX6D09nSOef7FMHZhgghitT29Srxi6vqQNQ@mail.gmail.com>
References: <CAN0CFw3t38cN76gxX6D09nSOef7FMHZhgghitT29Srxi6vqQNQ@mail.gmail.com>
Comments: In-reply-to Grant <emailgrant@gmail.com>
message dated "Thu, 11 Aug 2011 10:12:54 -0700."
X-Mailer: MH-E 8.2; nmh 1.3; GNU Emacs 23.3.1
Date: Thu, 11 Aug 2011 13:27:50 -0400
Message-ID: <32548.1313083670@ccs.covici.com>
From: covici@ccs.covici.com
X-SpamH-Filter: y-out0.smtp25.com-p7BHRsZD010177
Precedence: bulk
List-Post: <mailto:gentoo-user@lists.gentoo.org>
List-Help: <mailto:gentoo-user+help@lists.gentoo.org>
List-Unsubscribe: <mailto:gentoo-user+unsubscribe@lists.gentoo.org>
List-Subscribe: <mailto:gentoo-user+subscribe@lists.gentoo.org>
List-Id: Gentoo Linux mail <gentoo-user.gentoo.org>
X-BeenThere: gentoo-user@lists.gentoo.org
Reply-to: gentoo-user@lists.gentoo.org
X-Archives-Salt:
X-Archives-Hash: 59acbb915cea945253eb8fcb63fe7a22
Grant <emailgrant@gmail.com> wrote:
> 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?
--
Your life is like a penny. You're going to lose it. The question is:
How do
you spend it?
John Covici
covici@ccs.covici.com