From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: Enabling MSI on SATAII150 Date: Sat, 20 Aug 2005 02:19:05 -0400 Message-ID: <4306CB59.4000202@pobox.com> References: <20050611021814.riaatwh8ztskw4g4@www.nucleodyne.com> <42AC6310.7030809@rtr.ca> <1118598197.25250.20.camel@driver> <42ACFFED.9050701@pobox.com> <1119834710.13331.654.camel@driver> 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]:6625 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S1751078AbVHTGTR (ORCPT ); Sat, 20 Aug 2005 02:19:17 -0400 In-Reply-To: <1119834710.13331.654.camel@driver> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: kallol@nucleodyne.com Cc: Mark Lord , linux-ide@vger.kernel.org Kallol Biswas wrote: > Hello Jeff, > We have been using the sx8 driver on a MIPS based custom > platform. > It seems the line based interrupt mechanism is broken on the system. > > SATA1150 controller supports MSI interrupt like other PCI-X devices. > > Unfortunately we do not have access to the controller's technical > specification yet. > > Would it be possible to send us a reply detailing how to enable > MSI interrupt on the adapter? Should be just pci_enable_msi() in the appropriate place. Look at recent drivers/scsi/ahci.c for an example. > BTW, with CARM_MAX_Q == 30 and a workaround to fix lost interrupt we > have got good performance with the driver. Thanks for good work. MSI > will help improve performance more, as there won't be any delay > associated with handling lost interrupt. Cool. Jeff