From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vivek Goyal Subject: Re: [patch 6/7] blk: add plug for blkdev_issue_discard Date: Tue, 13 Mar 2012 11:51:20 -0400 Message-ID: <20120313155120.GG29169@redhat.com> References: <20120312030412.375458948@fusionio.com> <20120312031305.946211513@fusionio.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20120312031305.946211513@fusionio.com> Sender: linux-kernel-owner@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org, neilb@suse.de, axboe@kernel.dk, Shaohua Li , "Martin K. Petersen" List-Id: linux-raid.ids On Mon, Mar 12, 2012 at 11:04:18AM +0800, Shaohua Li wrote: > In raid 0 case, a big discard request is divided into several small requests > in chunk_size unit. Such requests can be merged in low layer if we have > correct plug added. This should improve the performance a little bit. Martin posted a patch to remove the support for allowing merging of discard requests. But this seems to be a reasonable use case for allowing mering discard requests. CCing Martin. Thanks Vivek