From: Marek Vasut <marek.vasut@gmail.com>
To: Ganeshan N <nganeshan1@yahoo.com>
Cc: linux-omap@vger.kernel.org
Subject: Re: OMAP3: Low DDR Memory bandwidth
Date: Wed, 4 Feb 2009 14:14:37 +0100 [thread overview]
Message-ID: <200902041414.38032.marek.vasut@gmail.com> (raw)
In-Reply-To: <703092.95158.qm@web112223.mail.gq1.yahoo.com>
On Wednesday 04 of February 2009 13:47:41 Ganeshan N wrote:
> Hi All,
> I am using OMAP3EVM and measuring DDR memory bandwidth. Used "lmbench" to
> measure the bandwidth. I am getting low bandwidth around 460 MB/S in TI
> kernel 2.6.22 and getting bandwidth around 800 MB/S in git kernel
> 2.6.28-rc8.
>
> In kernel 2.6.22, there are two SDRC registers (SDRC_DLLA_CTRL and
> SDRC_POWER_REG), which are getting modified. I have updated code such that
> SDRC values for both the the kernel 2.6.22 and 2.6.28 are same. After this
> updation there is no improvement in the bandwidth. The SDRC is running at
> 166MHz. I am using same x-loader and u-boot for both the kernel (2.6.22
> and 2.6.28).
>
> Can you please suggest some pointers/methods, to increase the DDR memroy
> bandwidth in 2.6.22 TI kernel.
>
> Thanks in advance.
why don't you use the .28 one then ? .22 is way too deprecated.
>
> With Regards
> Ganeshan
>
>
>
>
>
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next prev parent reply other threads:[~2009-02-04 13:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-04 12:47 OMAP3: Low DDR Memory bandwidth Ganeshan N
2009-02-04 13:14 ` Marek Vasut [this message]
2009-02-04 14:18 ` Måns Rullgård
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