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 ) id 1RIObM-00062F-5K for garchives@archives.gentoo.org; Mon, 24 Oct 2011 17:46:20 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 0CB0321C09B; Mon, 24 Oct 2011 17:46:10 +0000 (UTC) Received: from mail-bw0-f53.google.com (mail-bw0-f53.google.com [209.85.214.53]) by pigeon.gentoo.org (Postfix) with ESMTP id 54C6921C021 for ; Mon, 24 Oct 2011 17:45:10 +0000 (UTC) Received: by bke11 with SMTP id 11so10480875bke.40 for ; Mon, 24 Oct 2011 10:45:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=hwgY6jMaccXiFaCFOFlK2Re/Kk+c2RSK9TH0RV3ARiY=; b=kLtSeslak+obpSZAY55R7u/MzUg7Ie3xwYlNXPrzzAbAipmMJqbGOEZTmCsHTwUIkz kxHEM4tUR8DJWJ/nyp84BmOSxKqqee5wfA2HDutmZWMgTinP+W2rutlWrRCyi7w+Xxbp zghOjwox4wAlqQJSHgarHoZ3k9JaACDcfBzDk= Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 Received: by 10.204.15.211 with SMTP id l19mr10255671bka.75.1319478309429; Mon, 24 Oct 2011 10:45:09 -0700 (PDT) Received: by 10.204.37.16 with HTTP; Mon, 24 Oct 2011 10:45:09 -0700 (PDT) In-Reply-To: References: Date: Mon, 24 Oct 2011 13:45:09 -0400 Message-ID: Subject: Re: [gentoo-user] [OT] Disappointing USB3 performance From: Michael Mol To: gentoo-user@lists.gentoo.org Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Archives-Salt: X-Archives-Hash: 2100c4a4fabdb654afd0c42b1f666c8c On Mon, Oct 24, 2011 at 1:28 PM, walt wrote: > I just bought an add-on USB3 adapter and outboard USB3/sata docking > station, and I've been comparing the performance with my old e-sata > outboard docking station. =C2=A0Not so good :( > > After getting some unreliable results with hdparm, I settled on > copying one 3GB file from one partition of the outboard drive to > another partition of the same drive. =C2=A0These results are highly > reproducible, and favor e-sata over USB3 by a large margin. > > Over at least six trials on each docking station I consistently > get 105 seconds for USB and 84 seconds for e-sata, a 5:4 ratio > in favor of e-sata. > > I used the same hard disk and the same pci-e slot in the same > minimally-loaded machine for all the runs, and got very consistent > results every time. > > Basically, the USB3/sata docking station gets the same throughput as > the older sata 1 drives connected to the onboard pci sata controller, > which is still pretty respectable for an outboard drive, I think. > > So, has anyone out there done similar tests on USB3 drives yet? I have not; I don't have a system with USB3 yet. As far as USB3 goes, I'm more curious about host-host networking performance. Anyone played with that? If it's reasonably reliable, I could see 3-4 USB3 ports on three machines acting as a poor-man's high-performance, one-hop many-many mesh network, potentially good for network-synchronized block devices. I find Intel's Thunderbolt interesting for similar reasons. --=20 :wq