linux-kernel - Re: [patch 0/3] kvm tool: Serial emulation overhaul

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Date:	Mon, 12 Dec 2011 18:21:48 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pekka Enberg <penberg@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul


* Sasha Levin <levinsasha928@...il.com> wrote:

> > 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).
> 
> The performance problems here aren't the same performance 
> problems you have on real hardware. The problem here is that 
> it costs 40k cycles for the guest to access the emulated chip.

I question that 40k cycles figure - where does Marcelo's paper 
mention it?

Thanks,

	Ingo
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