From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: Marvell MV88SX6041 SATA Driver PIO4 Mode Not DMA Date: Fri, 11 Nov 2005 09:03:24 -0500 Message-ID: <4374A4AC.8010007@pobox.com> References: <1131648518.26701.247242836@webmail.messagingengine.com> <437471D0.3090404@pobox.com> <20051111121447.GQ3699@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.dvmed.net ([216.237.124.58]:56969 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1750766AbVKKODq (ORCPT ); Fri, 11 Nov 2005 09:03:46 -0500 In-Reply-To: <20051111121447.GQ3699@suse.de> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jens Axboe Cc: Spencer Tuttle , linux-ide@vger.kernel.org Jens Axboe wrote: > On Fri, Nov 11 2005, Jeff Garzik wrote: > >>Spencer Tuttle wrote: >> >>>I have just compiled the new 2.6.14 kernel from the gentoo-sources tree. >>> >>>I can access the drives just fine, but it seems really slow. Here is >>>the dmesg output when I load the kernel module >> >>That's expected, since the driver in 2.6.14 only does PIO mode. >> >>Try 2.6.14-gitN which supports EDMA. > > > Did you see these as well: > > blk_queue_max_hw_segments: set to minimum 1 > > Could it be forgetting to set ->sg_tablesize as well? [jgarzik@sata linux-2.6]$ grep MV_MAX_SG_CT drivers/scsi/sata_mv.c MV_MAX_SG_CT = 176, MV_SG_TBL_SZ = (16 * MV_MAX_SG_CT), .sg_tablesize = MV_MAX_SG_CT,