Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 11 Oct 2018 17:40:35 -0400
From:   "Theodore Y. Ts'o" <tytso@mit.edu>
To:     hpa@zytor.com
Cc:     Alan Cox <gnomes@lxorguk.ukuu.org.uk>,
        linux-serial@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>, Johan Hovold <johan@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>
Subject: Re: Insanely high baud rates
Message-ID: <20181011214035.GC565@thunk.org>
Mail-Followup-To: "Theodore Y. Ts'o" <tytso@mit.edu>, hpa@zytor.com,
        Alan Cox <gnomes@lxorguk.ukuu.org.uk>, linux-serial@vger.kernel.org,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Slaby <jslaby@suse.com>, Johan Hovold <johan@kernel.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>
References: <3fcef1c1-d746-ae82-c0e6-f079b1a53ffb@zytor.com>
 <20181010211717.30c1f052@alans-desktop>
 <16D6AB22-697E-498C-A5B2-3AD90B567E86@zytor.com>
 <20181011133134.085624af@alans-desktop>
 <8A583BC1-A295-48D2-B4C3-3E70AA50D035@zytor.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <8A583BC1-A295-48D2-B4C3-3E70AA50D035@zytor.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Oct 11, 2018 at 07:14:30AM -0700, hpa@zytor.com wrote:
> >
> >I mean - what is the baud rate of a pty  ?
>
> Whatever the master wants it to be...

I think Alan's point is that it is highly unlikely you would be able
to push the equivalent of 4 gbps through a PTY layer.  The TTY later
was never engineered for those speeds, and the real question is ---
what's the point?  That's what Ethernet is for.

       	   	   	       		   - Ted