From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ganeshan N Subject: OMAP3: Low DDR Memory bandwidth Date: Wed, 4 Feb 2009 04:47:41 -0800 (PST) Message-ID: <703092.95158.qm@web112223.mail.gq1.yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from n60.bullet.mail.sp1.yahoo.com ([98.136.44.40]:44214 "HELO n60.bullet.mail.sp1.yahoo.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751562AbZBDMrn convert rfc822-to-8bit (ORCPT ); Wed, 4 Feb 2009 07:47:43 -0500 Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: linux-omap@vger.kernel.org Hi All, I am using OMAP3EVM and measuring DDR memory bandwidth. Used "lmbench" = to measure the bandwidth.=A0 I am getting low bandwidth around 460 MB/S= in TI kernel 2.6.22 and getting bandwidth around 800 MB/S in git kerne= l 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=A0 the kernel 2.6.22 and 2.6.28 are same. Afte= r this updation there is no improvement in the bandwidth.=A0 The SDRC i= s running at 166MHz.=A0 I am using same x-loader and u-boot for both th= e kernel (2.6.22 and 2.6.28). Can you please suggest some pointers/methods, to increase the=A0DDR mem= roy bandwidth in 2.6.22=A0TI kernel. Thanks in advance. With Regards Ganeshan =20 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html