From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>, Pekka Enberg <penberg@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Sasha Levin <levinsasha928@gmail.com>
Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul
Date: Mon, 12 Dec 2011 10:27:50 +0000 [thread overview]
Message-ID: <20111212102750.469f0d9f@pyramind.ukuu.org.uk> (raw)
In-Reply-To: <alpine.LFD.2.02.1112111459270.3020@ionos>
> Well, the difference between ssh and serial is, that ssh can pack 1.5k
> worth of data into one frame, while serial has to send it
> piecewise. And the emulation has to trap into kvm tool for each tx
> byte, which doesnt help either. We cannot do much with buffering on
> the kvm tool side as we have no clue how much consecutive data will
> come in. That's why there is a virtual console, which has the
> disadvantage that you cant see the early boot messages.
You can emulate a chip with a 64byte or so FIFO. You can do I/O cycle
prediction in the kernel part and you can use the empty bit as a clue
(which is what most serial<->ethernet widgetry does).
Alan
next prev parent reply other threads:[~2011-12-12 10:30 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-10 13:27 Thomas Gleixner
2011-12-10 13:27 ` [patch 1/3] kvm tool: serial: Cleanup coding style Thomas Gleixner
2011-12-10 13:27 ` [patch 2/3] kvm tool: serial: Simplify switch cases Thomas Gleixner
2011-12-10 13:27 ` [patch 3/3] kvm tool: serial: Fix interrupt handling Thomas Gleixner
2011-12-10 15:17 ` [patch 0/3] kvm tool: Serial emulation overhaul Pekka Enberg
2011-12-10 20:51 ` Thomas Gleixner
2011-12-11 8:15 ` Pekka Enberg
2011-12-11 10:30 ` Ingo Molnar
2011-12-11 10:46 ` Ingo Molnar
2011-12-11 14:04 ` Thomas Gleixner
2011-12-11 15:53 ` Ingo Molnar
2011-12-12 5:30 ` Sasha Levin
2011-12-12 11:12 ` Ingo Molnar
2011-12-12 11:20 ` Alan Cox
2011-12-12 17:20 ` Ingo Molnar
2011-12-12 18:16 ` Avi Kivity
2011-12-12 18:16 ` Avi Kivity
2011-12-12 21:36 ` Alan Cox
2011-12-13 10:32 ` Avi Kivity
2011-12-12 11:23 ` Cyrill Gorcunov
2011-12-12 17:40 ` Sasha Levin
2011-12-12 17:45 ` Ingo Molnar
2011-12-12 9:42 ` Thomas Gleixner
2011-12-12 11:19 ` Pekka Enberg
2011-12-12 17:20 ` Ingo Molnar
2011-12-12 18:40 ` Pekka Enberg
2011-12-12 19:14 ` Pekka Enberg
2011-12-12 19:21 ` Ingo Molnar
2011-12-13 0:59 ` Thomas Gleixner
2011-12-13 7:03 ` Pekka Enberg
2011-12-13 11:05 ` Alan Cox
2011-12-13 10:58 ` Avi Kivity
2011-12-13 13:52 ` Thomas Gleixner
2011-12-13 14:23 ` Avi Kivity
2011-12-13 14:30 ` Sasha Levin
2011-12-13 14:51 ` Thomas Gleixner
2011-12-13 14:58 ` Avi Kivity
2011-12-12 21:03 ` James Courtier-Dutton
2011-12-12 18:19 ` Avi Kivity
2011-12-12 18:31 ` Pekka Enberg
2011-12-13 10:33 ` Avi Kivity
2011-12-12 10:27 ` Alan Cox [this message]
2011-12-12 10:59 ` Sasha Levin
2011-12-12 11:02 ` Alan Cox
2011-12-12 18:21 ` Avi Kivity
2011-12-12 17:21 ` Ingo Molnar
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