From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <447D923B.1080503@rtr.ca> Date: Wed, 31 May 2006 08:55:23 -0400 From: Mark Lord MIME-Version: 1.0 Subject: Re: [rfc][patch] remove racy sync_page? References: <447B8CE6.5000208@yahoo.com.au> <20060529183201.0e8173bc.akpm@osdl.org> <447BB3FD.1070707@yahoo.com.au> <447BD31E.7000503@yahoo.com.au> <447BD63D.2080900@yahoo.com.au> <447CE43A.6030700@yahoo.com.au> <447CF252.7010704@rtr.ca> <20060531061110.GB29535@suse.de> In-Reply-To: <20060531061110.GB29535@suse.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Jens Axboe Cc: Linus Torvalds , Nick Piggin , linux-kernel@vger.kernel.org, linux-mm@kvack.org, mason@suse.com, andrea@suse.de, hugh@veritas.com List-ID: Jens Axboe wrote: > > NCQ helps us with something we can never fix in software - the > rotational latency. Ordering is only a small part of the picture. Yup. And it also helps reduce the command-to-command latencies. I'm all for it, and have implemented tagged queuing for a variety of device drivers over the past five years (TCQ & NCQ). In every case people say.. wow, I expected more of a difference than that, while still noting the end result was faster under Linux than MS$. Of course with artificial benchmarks, and the right firmware in the right drives, it's easier to create and see a difference. But I'm talking more life-like loads than just a multi-threaded random seek generator. Cheers -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org