From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tejun Heo Subject: Re: about TRIM/DISCARD support and barriers Date: Sun, 30 Nov 2008 07:57:36 +0900 Message-ID: <4931C8E0.3080404@kernel.org> References: <83CA05F64804AF43B8F733C4ABDFAA51022D04B0@mail1.bitband.com> 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]:47648 "EHLO hera.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752895AbYK2W5P (ORCPT ); Sat, 29 Nov 2008 17:57:15 -0500 In-Reply-To: <83CA05F64804AF43B8F733C4ABDFAA51022D04B0@mail1.bitband.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Raz Ben-Yehuda Cc: linux-ide@vger.kernel.org hello, Raz Ben-Yehuda wrote: > Tejun Hello > Is there a WIKI for SSD disk in Linux? Not that I know of. > I want to understand what is the rational for the OS intervention. Why > and when you discard, fsck changes, why and how IO scheduling is > changed... FTL (flash translation layer) in SSDs can do better job if the OS tells it which area is unused so that the SSD can just drop or overwrite those regions. -- tejun