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

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Date:	Mon, 12 Dec 2011 18:20:59 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Sasha Levin <levinsasha928@...il.com>
Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul


* Pekka Enberg <penberg@...nel.org> wrote:

> On Sun, Dec 11, 2011 at 5:53 PM, Ingo Molnar <mingo@...e.hu> wrote:
> > Okay, but look at it from another angle: the top output i
> > generate is about 300k characters. 5000 msecs to execute it
> > means 16 usecs overhead per character - or about 50k cycles - on
> > a top of the class x86 CPU.
> 
> I'm seeing 1.5 usecs per character for this little benchmark:

Interesting - what do you see with the top -b measurement i 
posted - can you see similar slowdowns?

Thanks,

	Ingo
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