linux-kernel - Re: [PATCH] usb-core: Add MS_INTR

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Message-ID: <20170314084534.phqriqc2vq6wjd5f@var.youpi.perso.aquilenet.fr>
Date:   Tue, 14 Mar 2017 09:45:34 +0100
From:   Samuel Thibault <samuel.thibault@...-lyon.org>
To:     Dave Mielke <dave@...lke.cc>
Cc:     Alan Stern <stern@...land.harvard.edu>, gregkh@...uxfoundation.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        kevin.derome@...tech.eu, clause.andreabush@...il.com,
        mengualjeanphi@...e.fr
Subject: Re: [PATCH] usb-core: Add MS_INTR_BINTERVAL USB quirk

Dave Mielke, on lun. 13 mars 2017 22:20:01 -0400, wrote:
> It's possible that this device is using high speed because it offers a feature 
> to transfer its internal clipboard to the host, and it allows that clipboard to 
> contain lots of data. Interestingly, though, hidden within a usage note, they 
> do observe that, so far, they've been unable to achieve a transfer speed faster 
> than 5,000 characters in seven minutes. It looks to me like this is exactly due 
> to their incorrect setting of bInterval. :-) 

Well, still, with a 10ms interval, one can achieve at best 100 key
press events per second, thus 50 characters per second, i.e. not even
1200bps...

Samuel