From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Henri Roosen <henriroosen@domain.hid>
Cc: xenomai-help <xenomai@xenomai.org>
Subject: Re: [Xenomai-help] Does qemu-kvm impact realtime performance?
Date: Fri, 11 May 2012 10:22:30 +0200 [thread overview]
Message-ID: <4FACCC46.6050001@domain.hid> (raw)
In-Reply-To: <CANKLDmvnyqTJ-0poJHYWDtsrkrVdwsYGpw0uR3vfvJZg+hDYtQ@mail.gmail.com>
On 05/10/2012 04:26 PM, Henri Roosen wrote:
> Hi all,
>
> Does anyone know if running qemu-kvm impacts the realtime Xenomai
> performance of the host system?
>
> I have a multicore x86 target that runs a Xenomai enabled kernel and a
> realtime application. Next to the realtime application I would like to
> run qemu-kvm (on one of the cores) that runs some non-realtime guest
> os. So I would like to know if qemu-kvm have impact on the
> latencies/jitter of the realtime threads?
I would say it should have no direct impact, we should not expect kvm to
create hard irqs masking sections. However, as usual, running a whole OS
and applications inside another OS probably has a huge impact on cache,
and so should cause more jitter than running xenomai on an idle system.
--
Gilles.
next prev parent reply other threads:[~2012-05-11 8:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-10 14:26 [Xenomai-help] Does qemu-kvm impact realtime performance? Henri Roosen
2012-05-11 8:22 ` Gilles Chanteperdrix [this message]
[not found] ` <4FACCC46.6050001@xenomai.org>
2012-05-21 11:35 ` [Xenomai] " Jan Kiszka
2012-05-23 9:00 ` Henri Roosen
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