From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from server.roznica.com.ua ([91.194.72.3]:42794 "EHLO server.roznica.com.ua" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752807AbaDKSAP (ORCPT ); Fri, 11 Apr 2014 14:00:15 -0400 Received: from daemonw.roznica.com.ua (unknown [80.90.224.110]) by server.roznica.com.ua (Postfix) with ESMTP id F30B248046F for ; Fri, 11 Apr 2014 21:00:09 +0300 (EEST) Message-ID: <53482DA9.4090101@roznica.com.ua> Date: Fri, 11 Apr 2014 21:00:09 +0300 From: Michael MIME-Version: 1.0 To: linux-btrfs@vger.kernel.org Subject: Re: [RFC PATCH v10 00/16] Online(inband) data deduplication Content-Type: text/plain; charset=UTF-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi Liu, Thanks for your work. Each test copy 2gb file from sdf (btrfs) to sde (btrfs with dedup 4k blocksize). Before every test i recreate filesystem. On second write all goods. Test 1 Nodesize = leafsize = 4k Write overhead ~ x1.5 Test 2 Nodesize = leafsize = 16k Write overhead ~ x19 Test 1: fs created label (null) on /dev/sde nodesize 4096 leafsize 4096 sectorsize 4096 size 931.32GiB Btrfs v3.14-dirty ./btrfs dedup enable /mnt/backupkvm/ ; ./btrfs dedup on -b4k /mnt/backupkvm/ [root@hranilka2 ~]# cat /sys/block/sde/stat 157149 3096 1285992 128900 6472058 12962342 718660664 1511294062 0 1576195 1527264468 [root@hranilka2 ~]# cat /sys/block/sde/stat 157149 3096 1285992 128900 6526802 13268740 724690168 1512117500 0 1587233 1528090320 write sectors: 724690168 - 718660664 = 6029504 sector write mbyte: 6029504 * 512 / 1024 / 1024 ~ 2944 mb [root@hranilka2 ~]# cat /sys/block/sdf/stat 338633 165 346540680 7043771 7 4 1496 35 0 610795 7043095 [root@hranilka2 ~]# cat /sys/block/sdf/stat 342737 165 350743176 7127546 7 4 1496 35 0 618652 7126860 read sectors: 350743176 - 346540680 = 4202496 sector read mbyte: 4202496 * 512 / 1024 / 1024 ~ 2052 mb Test 2: fs created label (null) on /dev/sde nodesize 16384 leafsize 16384 sectorsize 4096 size 931.32GiB Btrfs v3.14-dirty ./btrfs dedup enable /mnt/backupkvm/ ; ./btrfs dedup on -b4k /mnt/backupkvm/ [root@hranilka2 ~]# cat /sys/block/sde/stat 157440 3313 1290392 129277 6526912 13272046 724722864 1512117920 0 1587500 1528091116 [root@hranilka2 ~]# cat /sys/block/sde/stat 157440 3313 1290392 129277 6964494 13836479 803994376 1514935880 0 1730081 1530910351 write sectors: 803994376 - 724722864 = 79271512 sector write mbyte: 79271512 * 512 / 1024 / 1024 ~ 38706 mb [root@hranilka2 ~]# cat /sys/block/sdf/stat 342737 165 350743176 7127546 7 4 1496 35 0 618652 7126860 [root@hranilka2 ~]# cat /sys/block/sdf/stat 346841 165 354945672 7266231 7 4 1496 35 0 629824 7265539 read sectors: 354945672 - 350743176 = 4202496 sector read mbyte: 4202496 * 512 / 1024 / 1024 ~ 2052 mb -- Michael Serikov --