Thanks for the tip. But that confirms it's running at 5000M: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M |__ Port 2: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M Weird, hey? It is almost like it's just not being allowed to get full speed though. I'm running Linux kernel 4.4.0 and 4.3.0 on the relevant machines. I did actually discover that initially, on one machine, I was accidentally using USB2, but after that facepalm moment and using usb3, only read speed went up -- writes still cap out at 27-28 mbyte/sec. Toby On Thu, 14 Jul 2016 at 17:44 Robin Humble via luv-main <luv-main@luv.asn.au> wrote:
On Wed, Jul 13, 2016 at 07:25:25AM +0000, Toby Corkindale via luv-main wrote:
I've hit a strange issue with a new USB storage device. (Corsair Slider X2 64GB)
On a Windows 10 laptop, it'll happily get ~75mbyte/sec writes.[1] Reads are even faster.
However on my Linux workstation the best I can get is 27 mbyte/sec, and the usual speed more like 9-10 mbyte/sec. ie. Awful. Reads aren't much better, at 37mbyte/sec.
does 'lsusb -t' say it's running at 5000M? eg.
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/6p, 5000M |__ Port 3: Dev 2, If 0, Class=Mass Storage, Driver=usb-storage, 5000M |__ Port 4: Dev 3, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
I guess there's a chance your device has been blacklisted for not playing nicely with usb3 or something like that too. you could grep for its usb ids under /etc/udev or /usr/lib/udev.
cheers, robin _______________________________________________ luv-main mailing list luv-main@luv.asn.au https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main