From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: David Jander <david.jander@protonic.nl>
Cc: linux-ppc-embedded <linuxppc-embedded@ozlabs.org>
Subject: Re: Kernel 2.6 on MPC8xx performance trouble...
Date: Fri, 28 Oct 2005 13:30:59 -0200 [thread overview]
Message-ID: <20051028153059.GC18915@logos.cnet> (raw)
In-Reply-To: <200510280857.44625.david.jander@protonic.nl>
On Fri, Oct 28, 2005 at 08:57:44AM +0200, David Jander wrote:
>
> Hi all,
>
> Many people have said it before: 2.6 has a performance penalty specially for
> embdedded systems.
> But now that I have 2.6 running on our 100MHz MPC852T based board, I was
> shocked to see the result:
> The most simple task doing nothing but a closed loop of integer math runs at
> _half_ the speed compared to kernel 2.4.25!!!!!
David,
Do you have CONFIG_PIN_TLB enabled?
If you do, please patch this in:
http://www.kernel.org/git/?p=linux/kernel/git/marcelo/8xx-fixes;a=commitdiff;h=a41ba028534c45280170c05c23609ea84f34b38a
And select DEBUG_PIN_TLBIE.
next prev parent reply other threads:[~2005-10-28 20:39 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-28 6:57 Kernel 2.6 on MPC8xx performance trouble David Jander
2005-10-28 9:36 ` Roger Larsson
2005-10-28 10:57 ` David Jander
2005-10-28 18:44 ` Roger Larsson
2005-10-28 20:37 ` Wolfgang Denk
2005-10-31 9:31 ` David Jander
2005-10-28 15:30 ` Marcelo Tosatti [this message]
2005-10-31 8:21 ` David Jander
2005-10-31 12:58 ` Mark Chambers
2005-10-31 13:08 ` David Jander
2005-10-31 15:29 ` David Jander
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