From: Manfred Gruber <m.gruber@tirol.com>
To: Ingo Molnar <mingo@elte.hu>, linux-rt-users@vger.kernel.org
Subject: Re: poison_obj latency
Date: Wed, 27 Jun 2007 15:24:25 +0200 [thread overview]
Message-ID: <200706271524.25557.m.gruber@tirol.com> (raw)
In-Reply-To: <20070627123435.GA24977@elte.hu>
Am Mittwoch, 27. Juni 2007 14:34 schrieben Sie:
> * Manfred Gruber <m.gruber@tirol.com> wrote:
> > hi !
> >
> > I use a arm4vt ep93xx processor with 2.6.21.5-rt18.
> > When i run cyclictest with -i 10000 and -n -p 90 -b 1000 i see some
> > strange latencies in poison_obj.
>
> disable SLAB_DEBUG. And look into your 'dmesg' output, the -rt kernel
> will warn about any other kernel config options as well that are known
> to cause large latencies:
>
> VFS: Mounted root (ext3 filesystem) readonly.
> ***************************************************************************
>** *
> * * REMINDER, the following debugging option is turned on in your
> .config: * *
> * * CONFIG_SLAB
> * *
> * * it may increase runtime overhead and latencies.
> * *
> *
> ***************************************************************************
>** Freeing unused kernel memory: 324k freed
>
> Ingo
ok, thanks without SLAB_DEBUG there is no poison_obj latency.
--
mfg
Manfred Gruber
prev parent reply other threads:[~2007-06-27 13:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-27 10:51 poison_obj latency Manfred Gruber
2007-06-27 12:34 ` Ingo Molnar
2007-06-27 13:24 ` Manfred Gruber [this message]
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