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 1RIRv4-0008ER-ES for garchives@archives.gentoo.org; Mon, 24 Oct 2011 21:18:54 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 6DCEA21C0C3; Mon, 24 Oct 2011 21:18:43 +0000 (UTC) Received: from out5.smtp.messagingengine.com (out5.smtp.messagingengine.com [66.111.4.29]) by pigeon.gentoo.org (Postfix) with ESMTP id 85F0B21C021 for ; Mon, 24 Oct 2011 21:17:21 +0000 (UTC) Received: from compute6.internal (compute6.nyi.mail.srv.osa [10.202.2.46]) by gateway1.nyi.mail.srv.osa (Postfix) with ESMTP id 40D082089D for ; Mon, 24 Oct 2011 17:17:21 -0400 (EDT) Received: from frontend1.nyi.mail.srv.osa ([10.202.2.160]) by compute6.internal (MEProxy); Mon, 24 Oct 2011 17:17:21 -0400 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d=binarywings.net; h=message-id:date:from:mime-version:to:subject:references :in-reply-to:content-type; s=mesmtp; bh=GdLWo7pW25ebW6/kVPJJmT2Y XZg=; b=oksb9fH4XjLwyX4S3mNdPFnn42riqi11XkmFnw7htkWGfau/nOaYY8S+ ww/sd1Okssvg2JD/0jFxIKSIcwIE4wvaSionxyXhe/nAG3/+25J+FZEI94AsVr34 ijbi/nbqzFUR+6rv5I6ZoXB16JN+7x+XmJVhGgLdl5PSTRCGCyE= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=message-id:date:from:mime-version:to :subject:references:in-reply-to:content-type; s=smtpout; bh=GdLW o7pW25ebW6/kVPJJmT2YXZg=; b=jTZTMizYJUQOCUFPEzJF3qN1Kd0aC62GStFr avVyv5pFr0MyU7nJFZ7MbP0XWlmifBttk3e+G9Pb70ILCBwKLYhaDg8wRoSJE3v2 twhbr2nT4ywfA5RHxdKU6VU+ALUL9VW8k2z0qimWNMWwe2cMMkU0PuFdwAYHaXRx vv5AZpo= X-Sasl-enc: +Pk1DCapx0fVtJ5IvzmivQRm4zYNxPsSkXIrf/3adctS 1319491040 Received: from [192.168.5.18] (serv.binarywings.net [83.169.5.6]) by mail.messagingengine.com (Postfix) with ESMTPSA id 2677E40BF40 for ; Mon, 24 Oct 2011 17:17:19 -0400 (EDT) Message-ID: <4EA5D5D7.20205@binarywings.net> Date: Mon, 24 Oct 2011 23:17:11 +0200 From: Florian Philipp User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.20) Gecko/20110925 Lightning/1.0b3pre Thunderbird/3.1.12 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 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] Re: [OT] Disappointing USB3 performance References: In-Reply-To: X-Enigmail-Version: 1.1.2 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enigE9643592DA89A8B37273BA78" X-Archives-Salt: X-Archives-Hash: 0c484ab94c640ad727b1af0b01ea47fc This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigE9643592DA89A8B37273BA78 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Am 24.10.2011 22:02, schrieb Grant Edwards: > On 2011-10-24, walt wrote: >=20 >> 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. Not 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. These 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. >=20 > Not surprising. Did you expect that adding a gateway device to the > communication path and another protocol layer on top of SATA would > make things faster? >=20 >> 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. >=20 > Yep, SATA performs the same as SATA. AFAIK, eSATA and SATA are > identical apart from the physical specs for the connector, a few minor > voltage level differences (to imporove noise tolerance), and hot-plug > support. > Normal SATA also offers hotplug. Usually works, too. >> So, has anyone out there done similar tests on USB3 drives yet? >=20 > There are disk drives that talk USB3 natively and aren't just using > USB<->SATA gateways? >=20 Well, there is USB Attached SCSI (CONFIG_USB_UAS in the kernel). It supports command queuing and works for USB-2.0 and 3.0 (but has additional software overhead for USB-2.0). I've not yet seen a compatible device, though. Regards, Florian Philipp --------------enigE9643592DA89A8B37273BA78 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk6l1dsACgkQqs4uOUlOuU+lSQCfaj59Iv8KYLUnNoHl4HoFq2Go rsYAn1iUq8FLgpJ2tExYB1dqn1/Hdcur =6xRn -----END PGP SIGNATURE----- --------------enigE9643592DA89A8B37273BA78--