From owner-freebsd-stable@freebsd.org Mon Jan 2 10:03:21 2017 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id BCF5BC9BFAD for ; Mon, 2 Jan 2017 10:03:21 +0000 (UTC) (envelope-from amarat@li.ru) Received: from fallback8.mail.ru (fallback8.mail.ru [94.100.181.110]) by mx1.freebsd.org (Postfix) with ESMTP id 21B991014 for ; Mon, 2 Jan 2017 10:03:20 +0000 (UTC) (envelope-from amarat@li.ru) Received: from smtp52.i.mail.ru (smtp52.i.mail.ru [94.100.177.112]) by fallback8.mail.ru (mPOP.Fallback_MX) with ESMTP id D8C1EB041597 for ; Mon, 2 Jan 2017 13:00:06 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mail.ru; s=mail2; h=Content-Type:In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject; bh=1qAkuumzAHswB1cVuOQsMFLytoF/pPbe34L5COCu/dw=; b=BZ3tEN/hCB2T+mJi4ZIDwxXVoX9gGmVrw+OybOAWkQGUcdzeUlVdOOzCHfcTp5QxHY9h2DiHXordwnADpiDvcPE9n7C6P9rsyK0I9MGu2XGfccEvyC3hRJrt7bDYARCOo1l1fDzi7YOrtsoFBw4xz9TZzOEsCsq82xnHMb/4m+Q=; Received: from [46.42.164.119] (port=43824 helo=zealot.ksu.ru) by smtp52.i.mail.ru with esmtpa (envelope-from ) id 1cNzPD-0005pQ-AK; Mon, 02 Jan 2017 12:59:52 +0300 Subject: Re: usb 3.0 thumb drive speed limit To: Ian Smith Cc: FreeBSD stable References: <586A0F05.6050504@li.ru> <20170102202711.G26979@sola.nimnet.asn.au> From: "Marat N.Afanasyev" Message-ID: <586A2495.5030301@li.ru> Date: Mon, 2 Jan 2017 12:59:49 +0300 User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:43.0) Gecko/20100101 Firefox/43.0 SeaMonkey/2.40 MIME-Version: 1.0 In-Reply-To: <20170102202711.G26979@sola.nimnet.asn.au> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms000807000606090009060208" Authentication-Results: smtp52.i.mail.ru; auth=pass smtp.auth=amarat@li.ru smtp.mailfrom=amarat@li.ru X-E1FCDC63: 1A10F875CA204C013FF2B7E4A03EC228083B9DBA0D511FCC X-E1FCDC64: 1C7907FFDF4F148A44CB5FD8C40EA486592821B2BC4A582373BF57F63AADC27B X-Mailru-Sender: 72B8A422CBF4A65B9C6F27F2260FCD71B9605988425226034C3C4D34DA5EC6C2A27AF0D55F04A21CF8D9167951635F18 X-Mras: OK X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Jan 2017 10:03:21 -0000 This is a cryptographically signed message in MIME format. --------------ms000807000606090009060208 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable Ian Smith wrote: > On Mon, 2 Jan 2017 11:27:49 +0300, Marat N.Afanasyev wrote: > > I wonder is there a speed limit on usb 3.0? I've bought > > > > ugen0.4: at usbus0 > > umass2 on uhub7 > > umass2: on usbu= s0 > > da2 at umass-sim2 bus 2 scbus9 target 0 lun 0 > > da2: Removable Direct Access SPC-4 SCSI devi= ce > > da2: Serial Number AA010808161609220143 > > da2: 40.000MB/s transfers > > da2: 59840MB (122552320 512 byte sectors) > > da2: quirks=3D0x2 > > > > that claims 'Up to 245 MBytes/sec read speed' > > > > and dd shows: > > > > % dd if=3D/dev/da2 of=3D/dev/null bs=3D1m count=3D1000 > > 1000+0 records in > > 1000+0 records out > > 1048576000 bytes transferred in 25.688997 secs (40818098 bytes/sec)= > > > > why we have such a limit? > > Seems you've plugged it into a USB 2 port, not USB 3 > > At least you're getting full USB 2 performance (40MB/s) > > Check if you have one or more USB 3 ports with 'dmesg | grep xhci' > > cheers, Ian > _______________________________________________ > freebsd-stable@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.or= g" > afair, single usb 2.0 device can be as fast as 240 Mbits/sec, not 320=20 Mbits/sec: % dd if=3D/dev/da2 of=3D/dev/null bs=3D1m count=3D1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 34.026227 secs (30816699 bytes/sec) it's the same drive in usb 2.0 port And I do have usb 3.0: % grep xhci /var/run/dmesg.boot xhci0: mem 0xfeaf8000-0xfeafffff irq = 17 at device 0.0 on pci5 xhci0: 64 bytes context size, 64-bit DMA usbus0 on xhci0 xhci0: mem 0xfeaf8000-0xfeafffff irq = 17 at device 0.0 on pci5 xhci0: 64 bytes context size, 64-bit DMA usbus0 on xhci0 and I tried this thumb drive is in usb 3.0 port first, of course. --=20 SY, Marat --------------ms000807000606090009060208 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature 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