From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marek Vasut Subject: Re: OMAP3: Low DDR Memory bandwidth Date: Wed, 4 Feb 2009 14:14:37 +0100 Message-ID: <200902041414.38032.marek.vasut@gmail.com> References: <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 mail-ew0-f21.google.com ([209.85.219.21]:42969 "EHLO mail-ew0-f21.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751128AbZBDNOg convert rfc822-to-8bit (ORCPT ); Wed, 4 Feb 2009 08:14:36 -0500 Received: by ewy14 with SMTP id 14so3261628ewy.13 for ; Wed, 04 Feb 2009 05:14:33 -0800 (PST) In-Reply-To: <703092.95158.qm@web112223.mail.gq1.yahoo.com> Content-Disposition: inline Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Ganeshan N Cc: linux-omap@vger.kernel.org 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.=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 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=A0 the kernel 2.6.22 and 2.6.28 are same. Af= ter this > updation there is no improvement in the bandwidth.=A0 The SDRC is run= ning at > 166MHz.=A0 I am using same x-loader and u-boot for both the kernel (2= =2E6.22 > and 2.6.28). > > Can you please suggest some pointers/methods, to increase the=A0DDR m= emroy > bandwidth in 2.6.22=A0TI kernel. > > Thanks in advance. why don't you use the .28 one then ? .22 is way too deprecated. > > With Regards > Ganeshan > > > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-omap"= in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- 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