From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1PgPX6-0007sP-U2 for garchives@archives.gentoo.org; Fri, 21 Jan 2011 22:32:41 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 96A45E0C08; Fri, 21 Jan 2011 22:31:08 +0000 (UTC) Received: from mail-vw0-f53.google.com (mail-vw0-f53.google.com [209.85.212.53]) by pigeon.gentoo.org (Postfix) with ESMTP id 5F5E5E0C08 for ; Fri, 21 Jan 2011 22:31:07 +0000 (UTC) Received: by vws8 with SMTP id 8so999180vws.40 for ; Fri, 21 Jan 2011 14:31:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=OFJ5Q454UlBsFthO+xKXcbeFtibryjsr/nkCGMeVj9w=; b=ZqU1AR/yQmlFSIjoqUuxVZlE283jatXuDVKIoMvhnG8XilFD103Fkvb6+jWueaudhK V8hpFqfh48ATEZjCeTKHsHMrjA5w9UgOz8gIC+JUiDZoG4uHICQvW4/lBHWOBnds/aCc bdIMkMHS5wt/uJr4AYQwccv4s9QY3Y+k6JTgM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:subject:references :in-reply-to:content-type:content-transfer-encoding; b=wpcg5ecuUY9oGBUTbpGaEzR7BiMMsBR00hTepczfa/5reOjFwrhEJlzRVJ+CUYOB3Q Vu08LVbqJ4MLd94huNIbkK6IdntQtckLmmV9lwr7ae1HgJTdhV0MxyTISnheCgEejoj/ 9wupT1URmtcsH5/wSevOLAICixI36YVaXhzZA= Received: by 10.220.202.134 with SMTP id fe6mr324426vcb.245.1295649067700; Fri, 21 Jan 2011 14:31:07 -0800 (PST) Received: from [192.168.2.5] (adsl-0-115-233.jan.bellsouth.net [65.0.115.233]) by mx.google.com with ESMTPS id c15sm3432932vcs.31.2011.01.21.14.31.06 (version=SSLv3 cipher=RC4-MD5); Fri, 21 Jan 2011 14:31:06 -0800 (PST) Message-ID: <4D3A0929.6080606@gmail.com> Date: Fri, 21 Jan 2011 16:31:05 -0600 From: Dale User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20101212 Gentoo/2.0.11 SeaMonkey/2.0.11 Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org MIME-Version: 1.0 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] AHCI/IDE-question References: <20110121184507.GC5787@solfire> <20110121201150.GC5878@solfire> <4D39EE7D.6070603@gmail.com> <201101220006.02377.alan.mckinnon@gmail.com> In-Reply-To: <201101220006.02377.alan.mckinnon@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Archives-Salt: X-Archives-Hash: 46c642c9ef60e431d276131fed6348d9 Alan McKinnon wrote: > My notebook works like that too. > > Hard disk works fine when everything is set to AHCI, but then the system won't > boot from CD. So I enabled the IDE driver and the IDE driver for CD-ROMs. > > My take on this is that Dell had a vast stock of cheap-skate CD-ROM hardware > and used them up. The engineering logic would have been "it doesn't matter > that we use the slow interface for that device, it's still faster than we can > get the data off the media." > > And I thought there was something weird with me on this one. o_O I did switch it back to AHCI after I got done booting the CD thingy. I really can't tell any difference in speed between the two and neither could hdparm -tT either. root@fireball / # hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 6408 MB in 2.00 seconds = 3205.06 MB/sec Timing buffered disk reads: 328 MB in 3.00 seconds = 109.22 MB/sec root@fireball / # I get about the same either way. Could that mean that when the kernel boots that it switched over to AHCI regardless of the BIOS setting? This is a little info too: root@fireball / # dmesg | grep -i ahci [ 0.827837] ahci 0000:00:11.0: version 3.0 [ 0.827855] ahci 0000:00:11.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22 [ 0.828285] ahci 0000:00:11.0: AHCI 0001.0100 32 slots 6 ports 3 Gbps 0x3f impl SATA mode [ 0.828840] ahci 0000:00:11.0: flags: 64bit ncq sntf ilck pm led clo pmp pio slum part ccc [ 0.830342] scsi0 : ahci [ 0.830734] scsi1 : ahci [ 0.831103] scsi2 : ahci [ 0.831474] scsi3 : ahci [ 0.831843] scsi4 : ahci [ 0.832204] scsi5 : ahci root@fireball / # Someone may can talk be into rebooting and switching AHCI off and testing again. Big may there. ;-) Dale :-) :-) P. S. Seriously off topic. I used hugin the other day to stitch together about a dozen pics from a 10Mpxl camera. It was awesome to watch all four cores crunch on that thing. It was fast too. Going from a single 2.5Ghz CPU to a four core 3.2Ghz CPU is a huge difference.