From: Avi Kivity <avi@redhat.com>
To: Pekka Enberg <penberg@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>,
Sasha Levin <levinsasha928@gmail.com>
Subject: Re: [patch 0/3] kvm tool: Serial emulation overhaul
Date: Tue, 13 Dec 2011 12:33:48 +0200 [thread overview]
Message-ID: <4EE72A0C.7020401@redhat.com> (raw)
In-Reply-To: <1323714698.1428.299.camel@jaguar>
On 12/12/2011 08:31 PM, Pekka Enberg wrote:
> On Mon, 2011-12-12 at 20:19 +0200, Avi Kivity wrote:
> > On 12/12/2011 01:19 PM, Pekka Enberg wrote:
> > > On Sun, Dec 11, 2011 at 5:53 PM, Ingo Molnar <mingo@elte.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.
>
> No interrupts. I was simply trying to measure PIO overhead to see how
> bad the 15 usec per character Ingo measured really is.
Yeah.
Anyway, uart serial is never going to be fast. That's what
virtio-serial is for.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-12-13 10:34 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-10 13:27 [patch 0/3] kvm tool: Serial emulation overhaul 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 [this message]
2011-12-12 10:27 ` Alan Cox
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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