From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: ahci: CAP_SSS and parallel scan Date: Thu, 06 May 2010 10:22:33 +0200 Message-ID: <4BE27C49.5090809@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from hera.kernel.org ([140.211.167.34]:33112 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755098Ab0EFIXA (ORCPT ); Thu, 6 May 2010 04:23:00 -0400 Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Arjan van de Ven Cc: Jeff Garzik , t.artem@mailcity.com, "linux-ide@vger.kernel.org" Hello, Artem reported on bko#15918 that on his machine ahci probing takes too long (well, if you ask me, that's not too long but anyways). This is caused by CAP_SSS disabling parallel scan. The code was added by Arjan in commit 886ad09fc83342aa1c5a02a0b6d3298b78a8067f. There is a module parameter to skip this but I'm curious whether the change was based on an actual problem as on most PC hardware by the time ahci driver kick in, the BIOS has spun up everything already. Thanks. -- tejun