From: Ralf Baechle <ralf@linux-mips.org>
To: Ashlesha Shintre <ashlesha@kenati.com>
Cc: linux-mips@linux-mips.org
Subject: Re: Portmap on the Encore M3
Date: Tue, 14 Nov 2006 13:05:03 +0000 [thread overview]
Message-ID: <20061114130503.GB28579@linux-mips.org> (raw)
In-Reply-To: <1163469787.6532.26.camel@sandbar.kenati.com>
On Mon, Nov 13, 2006 at 06:03:07PM -0800, Ashlesha Shintre wrote:
> > > > 16.35 BogoMIPS (lpj=8176)
> >
> > Sounds about right if your CPU clock hapens to be 8MHz so probably not.
> > Chances the counter was missprogrammed. Or are you running uncached?
> > Uncached will completly devastate performance.
> >
>
> For the AU1500 processor, the CPU Clock is derived from the PLL whose
> input is 12MHz.. Upon reading the value of the SYS_CPUPLL register in
> the calibrate_delay function, I found out that the multiplying factor is
> 40, thus, the CPU Clock frequency is 480MHz.. Thus the lpj should be
> approximately 480000 -- right?
From a CPU core like the Alchemy core I would more expect half of that
number, 240000. That is if HZ is 1000 which I believe it was still
hardwired for kernels of the vintage you're running.
> Also I dont know what you mean by "running uncached"?
CONFIG_MIPS_UNCACHED which disables all processor caches. Bad idea.
> Thanks a lot, I will check the problem with the serial driver -- i m
> using the 8250.c serial driver..
Use CONFIG_SERIAL_AU1X00.
Ralf
WARNING: multiple messages have this Message-ID (diff)
From: Ralf Baechle <ralf@linux-mips.org>
To: Ashlesha Shintre <ashlesha@kenati.com>
Cc: linux-mips@linux-mips.org
Subject: Re: Portmap on the Encore M3
Date: Tue, 14 Nov 2006 13:05:03 +0000 [thread overview]
Message-ID: <20061114130503.GB28579@linux-mips.org> (raw)
Message-ID: <20061114130503.QEIMyf8RobJKNeakvr5ODbtdk2ibB8sqoG1F8rGN2Qc@z> (raw)
In-Reply-To: <1163469787.6532.26.camel@sandbar.kenati.com>
On Mon, Nov 13, 2006 at 06:03:07PM -0800, Ashlesha Shintre wrote:
> > > > 16.35 BogoMIPS (lpj=8176)
> >
> > Sounds about right if your CPU clock hapens to be 8MHz so probably not.
> > Chances the counter was missprogrammed. Or are you running uncached?
> > Uncached will completly devastate performance.
> >
>
> For the AU1500 processor, the CPU Clock is derived from the PLL whose
> input is 12MHz.. Upon reading the value of the SYS_CPUPLL register in
> the calibrate_delay function, I found out that the multiplying factor is
> 40, thus, the CPU Clock frequency is 480MHz.. Thus the lpj should be
> approximately 480000 -- right?
next prev parent reply other threads:[~2006-11-14 13:04 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-13 18:46 Portmap on the Encore M3 Ashlesha Shintre
2006-11-13 23:38 ` Ralf Baechle
2006-11-14 2:03 ` Ashlesha Shintre
2006-11-14 13:05 ` Ralf Baechle [this message]
2006-11-14 13:05 ` Ralf Baechle
2006-11-14 18:28 ` Ashlesha Shintre
2006-11-14 19:11 ` Ralf Baechle
2006-11-15 22:24 ` Ashlesha Shintre
2006-11-20 23:41 ` LPJ value on the AU1500 Ashlesha Shintre
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