Gary Palmer wrote:
On Mon, Jan 02, 2017 at 11:27:49AM +0300, Marat N.Afanasyev wrote:I wonder is there a speed limit on usb 3.0? I've boughtugen0.4: <SanDisk> at usbus0 umass2 on uhub7 umass2: <SanDisk Extreme, class 0/0, rev 2.10/0.10, addr 4> on usbus0 da2 at umass-sim2 bus 2 scbus9 target 0 lun 0 da2: <SanDisk Extreme 0001> Removable Direct Access SPC-4 SCSI device da2: Serial Number AA010808161609220143 da2: 40.000MB/s transfers da2: 59840MB (122552320 512 byte sectors) da2: quirks=0x2<NO_6_BYTE> that claims 'Up to 245 MBytes/sec read speed'I don't think the speed reported by the SCSI layer (CAM) is correct for USB, although it seems from an experiment here that if you plug a USB3 drive into a USB2 port it reports "40.000MB/s transfers" and on a USB3 port it reports "400.000MB/s transfers". SCSI doesn't really have any direct mapping to the USB speeds so I suspect the USB stack uses the closest value. The tests I did were with 10.3. Other releases may behave differently. Check with usbconfig what the negotiated USB speed is (the "spd=" value with the Mbps or Gbps value in brackets afterwards) FULL = USB1 HIGH = USB2 SUPER = USB3 Regards, Gary _______________________________________________ freebsd-stable@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
it seems that drive doesn't attach as usb 3.0 even when plugged into pci-e card port directly, to say nothing about the hub. probably it's buggy firmware of addon card, I'll try to find newer firmware and flash it, if one exists
-- SY, Marat
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