From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:39452 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754398AbaEFTmN (ORCPT ); Tue, 6 May 2014 15:42:13 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1WhjXD-0006Vw-Tj for linux-btrfs@vger.kernel.org; Tue, 06 May 2014 19:52:08 +0200 Received: from ip68-231-22-224.ph.ph.cox.net ([68.231.22.224]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 06 May 2014 19:52:07 +0200 Received: from 1i5t5.duncan by ip68-231-22-224.ph.ph.cox.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 06 May 2014 19:52:07 +0200 To: linux-btrfs@vger.kernel.org From: Duncan <1i5t5.duncan@cox.net> Subject: Re: Using mount -o bind vs mount -o subvol=vol Date: Tue, 6 May 2014 17:34:11 +0000 (UTC) Message-ID: References: <20140504004732.GE9061@merlins.org> <5365E74B.6020805@swiftspirit.co.za> <20140505005644.GB10159@merlins.org> <53670FEA.8050806@swiftspirit.co.za> <20140505103617.0e66f5a9@natsu> <536735FB.6020205@swiftspirit.co.za> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Brendan Hide posted on Mon, 05 May 2014 08:55:55 +0200 as excerpted: > You are 100% right, though. The scale is very small. By negligible, the > "penalty" is at most a few CPU cycles. When compared to the wait time on > a spindle, it really doesn't matter much. The analogy I've used before is that of taking a trip (which the data effectively is, between the device and the CPU). We've booked a 10-day cruise and are now debating what we plan on taking to and from the boarding dock. Will taking the local bus with a couple of transfers, or a taxi that will take us there in one trip but there's road construction and thus a detour, or a helicopter to fly directly, get us back from the cruise faster? Obviously, taking the helicopter (at least for the return leg) will get us back a bit faster, but we're talking perhaps a couple hours difference at the end of a 10 day cruise! =:^) -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman