Date: Mon, 2 Jan 2017 12:59:49 +0300 From: "Marat N.Afanasyev" <amarat@li.ru> To: Ian Smith <smithi@nimnet.asn.au> Cc: FreeBSD stable <freebsd-stable@freebsd.org> Subject: Re: usb 3.0 thumb drive speed limit Message-ID: <586A2495.5030301@li.ru> In-Reply-To: <20170102202711.G26979@sola.nimnet.asn.au> References: <586A0F05.6050504@li.ru> <20170102202711.G26979@sola.nimnet.asn.au>
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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: <SanDisk> at usbus0 > > umass2 on uhub7 > > umass2: <SanDisk Extreme, class 0/0, rev 2.10/0.10, addr 4> on usbu= s0 > > da2 at umass-sim2 bus 2 scbus9 target 0 lun 0 > > da2: <SanDisk Extreme 0001> 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<NO_6_BYTE> > > > > 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: <XHCI (generic) USB 3.0 controller> mem 0xfeaf8000-0xfeafffff irq = 17 at device 0.0 on pci5 xhci0: 64 bytes context size, 64-bit DMA usbus0 on xhci0 xhci0: <XHCI (generic) USB 3.0 controller> 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" 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