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

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Date:   Tue, 25 Jul 2017 19:46:28 +0200
From:   Zdenek Kabelac <zkabelac@...hat.com>
To:     Alan Stern <stern@...land.harvard.edu>
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

Dne 25.7.2017 v 19:02 Alan Stern napsal(a):
> 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
> 

Hi


Sure - no pb.

Just attached & detached  USB disk in this trace

Zdenek





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