linux-kernel - Re: Insanely high baud rates

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Message-ID: <e2d6b234-0127-78df-6d37-13e0c4777db8@zytor.com>
Date:   Thu, 11 Oct 2018 22:48:51 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        linux-serial@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Johan Hovold <johan@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: Insanely high baud rates

On 10/11/18 2:40 PM, Theodore Y. Ts'o wrote:
> On Thu, Oct 11, 2018 at 07:14:30AM -0700, hpa@...or.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.
> 

I like to consider the far future; I think things like the Y2038 problem is a
good example. Or, as I like to put it, "numbers are cheap, running out of
numbers is expensive." Sounds like we have enough of a plan that we aren't
completely stuck should it ever become an issue.  It might never, of course.

	-hpa