Linux on ARM based TI OMAP SoCs
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From: Ganeshan N <nganeshan1@yahoo.com>
To: linux-omap@vger.kernel.org
Subject: OMAP3: Low DDR Memory bandwidth
Date: Wed, 4 Feb 2009 04:47:41 -0800 (PST)	[thread overview]
Message-ID: <703092.95158.qm@web112223.mail.gq1.yahoo.com> (raw)

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.

With Regards
Ganeshan



      

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             reply	other threads:[~2009-02-04 12:47 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-02-04 12:47 Ganeshan N [this message]
2009-02-04 13:14 ` OMAP3: Low DDR Memory bandwidth Marek Vasut
2009-02-04 14:18 ` Måns Rullgård

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