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Re: Benchmarking RM9000

To: Alex Gonzalez <linux-mips@packetvision.com>
Subject: Re: Benchmarking RM9000
From: Ralf Baechle <ralf@linux-mips.org>
Date: Mon, 11 Jul 2005 00:14:19 +0100
Cc: linux-mips@linux-mips.org
In-reply-to: <1120833749.28569.965.camel@euskadi.packetvision>
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References: <20050708091711Z8226352-3678+1954@linux-mips.org> <20050708120238.GA2816@linux-mips.org> <1120825549.28569.949.camel@euskadi.packetvision> <20050708130131.GC2816@linux-mips.org> <1120833749.28569.965.camel@euskadi.packetvision>
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On Fri, Jul 08, 2005 at 03:42:29PM +0100, Alex Gonzalez wrote:

> The performance of our video application is well below our expectations.
> We are still doing some profiling work on it, but we are also looking at
> other possibilities.
> 
> What other benchmarking tool would you recommend?
> 
> Currently it's a NFS mounted system, but even if we could use a block
> device the access speed wouldn't be more than 1.5 Mbps, so that is a
> limitation for the benchmark.

As a shot into the dark ...

Make sure you exploit the RM9000's write-gathering capabilities when
writing into the frame buffer.  If the frame buffer happens to be on
a PCI device you're probably performing uncached writes which will
slow down the thing to a crawl.

  Ralf

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