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 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
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