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Message-ID: <20111212172000.GB23870@elte.hu>
Date: Mon, 12 Dec 2011 18:20:00 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Sasha Levin <levinsasha928@...il.com>,
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
* Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> > [*] Also, those 10K cycles include some significant Qemu
> > overhead - a couple of thousand cycles - that should be much
> > lower in the tools/kvm case.
>
> Are all the traps going into qemu - is KVM still that braindead ?
I don't know what exactly Marcelo has measured - it seems a PIO
trap handled by the VM monitor process - i.e. Qemu in that case.
Thanks,
Ingo
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