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Date: Mon, 12 Dec 2011 20:19:28 +0200
From: Avi Kivity <avi@...hat.com>
To: Pekka Enberg <penberg@...nel.org>
CC: Ingo Molnar <mingo@...e.hu>, 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
On 12/12/2011 01:19 PM, Pekka Enberg 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:
>
>
No interrupts, right? Things look differently with one interrupt per
character and none. Try running kvm_stat with your benchmark and with a
guest kernel flooding the serial port.
--
error compiling committee.c: too many arguments to function
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