Re: USB disk speed regression WD Elements - with bisect result 22547c4cc4fe20698a6a85a55b8788859134b8e4

[Alan Stern]

On Tue, 25 Jul 2017, Zdenek Kabelac wrote:

> And in fact it's the very same commit - which adds this message
> (just check current 4.13 with and without this commit reverted)
> 
> So here goes usbmon trace (aka  'cat /sys/kernel/debug/usb/usbmon/0u')
> no other usb device has been touch so should not hopefully interfere here.
> 
> Trace is from 4.12 kernel - so it has reported  "not running at top speed"

Can you collect an equivalent trace under 4.8?

Alan Stern