From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CC015C677FC for ; Thu, 11 Oct 2018 21:40:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 78E422077C for ; Thu, 11 Oct 2018 21:40:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=thunk.org header.i=@thunk.org header.b="SeY86FuN" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 78E422077C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=mit.edu Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726551AbeJLFJv (ORCPT ); Fri, 12 Oct 2018 01:09:51 -0400 Received: from imap.thunk.org ([74.207.234.97]:50118 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725956AbeJLFJu (ORCPT ); Fri, 12 Oct 2018 01:09:50 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=thunk.org; s=ef5046eb; h=In-Reply-To:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=pa8arxrR6EEaswkCZGjNLBp6Ps3tRPa/PCCHGEfFTtA=; b=SeY86FuNqkh3Ur/JjIg907crqE uudWgRmxOrFzS0MjK7Lb3ng15UJDd1xjfPCqHqxtcMbWKhtov7YBCQ4WFU5QXb0k4YNUah5ly8Tzc FFXr4P3kNSRHcLgRuPhR1QOAnx+DPgdPSXIRgqBQ/TgAEId24vwD03dPmFLv7K2Cg8dA=; Received: from root (helo=callcc.thunk.org) by imap.thunk.org with local-esmtp (Exim 4.89) (envelope-from ) id 1gAihA-0005Mo-Fj; Thu, 11 Oct 2018 21:40:36 +0000 Received: by callcc.thunk.org (Postfix, from userid 15806) id B9EAD7A51DE; Thu, 11 Oct 2018 17:40:35 -0400 (EDT) Date: Thu, 11 Oct 2018 17:40:35 -0400 From: "Theodore Y. Ts'o" To: hpa@zytor.com Cc: Alan Cox , linux-serial@vger.kernel.org, Linux Kernel Mailing List , Greg Kroah-Hartman , Jiri Slaby , Johan Hovold , Alexander Viro Subject: Re: Insanely high baud rates Message-ID: <20181011214035.GC565@thunk.org> Mail-Followup-To: "Theodore Y. Ts'o" , hpa@zytor.com, Alan Cox , linux-serial@vger.kernel.org, Linux Kernel Mailing List , Greg Kroah-Hartman , Jiri Slaby , Johan Hovold , Alexander Viro 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) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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