From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f177.google.com ([209.85.213.177]:36834 "EHLO mail-ig0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751931AbbJYCM6 (ORCPT ); Sat, 24 Oct 2015 22:12:58 -0400 Received: by igdg1 with SMTP id g1so38640724igd.1 for ; Sat, 24 Oct 2015 19:12:57 -0700 (PDT) Received: from [192.168.0.233] (MTRLPQ0313W-LP140-05-1279438538.dsl.bell.ca. [76.66.174.202]) by smtp.googlemail.com with ESMTPSA id j94sm10719661iod.3.2015.10.24.19.12.56 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sat, 24 Oct 2015 19:12:56 -0700 (PDT) To: linux-btrfs@vger.kernel.org From: Nicholas Steeves Subject: wow! Message-ID: <562C3AA7.9060007@gmail.com> Date: Sat, 24 Oct 2015 22:12:55 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi, I upgraded to linux-4.2.3 and btrfs-progs-4.2.3 yesterday, and wow, there must have been bigger between linux-4.1.10 and 4.2.3 than were mentioned in the changelog! I've been testing btrfs on a Thinkpad X200 with an i5-2450M, Intel 320 SSD, and 8GB of RAM for over a year now, since when when linux-3.16 and btrfs-progs-3.17 were very new. Performance had been steadily degrading, or hit or miss (I'm not sure if defrag or fstrim actually work...), but stability was getting better. The regular use case I use a benchmark is how fast the backup goes. If the numbers seem unusual, I'll reboot and run: tar cf- /.snapshots/only_one_snapshot | pv -pabet > /dev/null then reboot and run btrfs send /.snapshots/only_one_snapshot | pv -pabet > /dev/null The worst run I've seen this last year for both of these commands~60 MiB/s throughput to /dev/null... A year ago, when the file system was brand new, after I filled the fs with my regular data, the average was: GNU tar: ~125 MiB/s BSD tar: ~129 MiB/s btrfs send: ~140 MiB/s Now with linux-4.2.3 and btrfs-progs-4.2.3: GNU tar: ~134 MiB/s BSD tar: ~129 MiB/s btrfs send: ~133 MiB/s This is the first time a backup has run at the speed of a fresh filesystem; I have not recently run fstrim or btrfs fi defrag, so I was very pleasantly surprised! Thank you all very much for your hard work. Kind regards, Nicholas