Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751882Ab2J0EpE (ORCPT ); Sat, 27 Oct 2012 00:45:04 -0400 Received: from li9-11.members.linode.com ([67.18.176.11]:57924 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750811Ab2J0EpC (ORCPT ); Sat, 27 Oct 2012 00:45:02 -0400 Date: Sat, 27 Oct 2012 00:44:56 -0400 From: "Theodore Ts'o" To: Vladislav Bolkhovitin Cc: =?utf-8?B?5p2o6IuP56uL?= Yang Su Li , General Discussion of SQLite Database , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, drh@hwaci.com Subject: Re: [sqlite] light weight write barriers Message-ID: <20121027044456.GA2764@thunk.org> Mail-Followup-To: Theodore Ts'o , Vladislav Bolkhovitin , =?utf-8?B?5p2o6IuP56uL?= Yang Su Li , General Discussion of SQLite Database , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, drh@hwaci.com References:

<5086F5A7.9090406@vlnb.net> <20121025051445.GA9860@thunk.org> <508B3EED.2080003@vlnb.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <508B3EED.2080003@vlnb.net> User-Agent: Mutt/1.5.21 (2010-09-15) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: tytso@thunk.org X-SA-Exim-Scanned: No (on imap.thunk.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2604 Lines: 49 On Fri, Oct 26, 2012 at 09:54:53PM -0400, Vladislav Bolkhovitin wrote: > What different in our positions is that you are considering storage > as something you can connect to your desktop, while in my view > storage is something, which stores data and serves them the best > possible way with the best performance. I don't get paid to make Linux storage work well for gold-plated storage, and as far as I know, none of the purveyors of said gold plated software systems are currently employing Linux file system developers to make Linux file systems work well on said gold-plated hardware. As for what I might do on my own time, for fun, I can't afford said gold-plated hardware, and personally I get a lot more satisfaction if I know there will be a large number of people who benefit from my work (it was really cool when I found out that millions and millions of Android devices were going to be using ext4 :-), as opposed to a very small number of people who have paid $$$ to storage vendors who don't feel it's worthwhile to pay core Linux file system developers to leverage their hardware. Earlier, you were bemoaning why Linux file system developers weren't paying attention to using said fancy SCSI features. Perhaps now you'll understand better it's not happening? > Price doesn't matter here, because it's completely different topic. It matters if you think I'm going to do it on my own time, out of my own budget. And if you think my employer is going to choose to use said hardware, price definitely matters. I consider engineering to be the art of making tradeoffs, and price is absolutely one of the things that we need to trade off against other goals. It's rare that you get to design something where performance matters above all else. Maybe it's that way if you're paid by folks whose job it is to destablize the world's financial markets by pushing the holes into the right half plane (i.e., high frequency trading :-). But for the rest of the world, price absolutely matters. - Ted P.S. All of the storage I have access to at home is SATA. If someone would like to change that and ship me free hardware, as long as it doesn't require three-phase power (or require some exotic interconnect which is ghastly expensive and which you are also not going to provide me for free), do contact me off-line. :-) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/