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

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Message-ID: <Pine.LNX.4.44L0.1707251301570.2256-100000@iolanthe.rowland.org>
Date:   Tue, 25 Jul 2017 13:02:30 -0400 (EDT)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Zdenek Kabelac <zkabelac@...hat.com>
cc:     LKML <linux-kernel@...r.kernel.org>, <dianders@...omium.org>,
        <linux@...ck-us.net>, <gregkh@...uxfoundation.org>
Subject: Re: USB disk speed regression WD Elements - with bisect result
 22547c4cc4fe20698a6a85a55b8788859134b8e4

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