From mboxrd@z Thu Jan 1 00:00:00 1970 From: Michael Thonke Subject: Re: Playing with SATA NCQ Date: Sun, 29 May 2005 20:10:52 +0200 Message-ID: <429A05AC.9020805@gmail.com> References: <20050526140058.GR1419@suse.de> <429793C8.8090007@gmail.com> <42979C4F.8020007@pobox.com> <42979FA3.1010106@gmail.com> <20050528121258.GA17869@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from wproxy.gmail.com ([64.233.184.203]:38327 "EHLO wproxy.gmail.com") by vger.kernel.org with ESMTP id S261393AbVE2SLC (ORCPT ); Sun, 29 May 2005 14:11:02 -0400 Received: by wproxy.gmail.com with SMTP id 68so1391649wri for ; Sun, 29 May 2005 11:10:59 -0700 (PDT) In-Reply-To: <20050528121258.GA17869@suse.de> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Jens Axboe Cc: Jeff Garzik , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Jens Axboe schrieb: >There's really nothing to be tuned. If NCQ is enabled for your drive, it >will be printed in dmesg after the lba48 flag, such as: > >ata1: dev 0 ATA, max UDMA/133, 488281250 sectors lba48 ncq > >If you don't see NCQ there, your drive/controller doesn't support it. >Likewise you will have a queueing depth of > 1 if NCQ is enabled, check >/sys/block/sdX/device/queue_depth to see what the configured queueing >depth is for that device. > > > Hello again, the queue_depth of 30 is okay? On boot the CFQ scheduler tells: cfq: depth 4 reached, tagging now on This only appears with AHCI enabled what does that mean? Also a question which options can be set in queue_type? Best regard and thanks for help Greets Michael