From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9FF4C7EE23 for ; Tue, 2 May 2023 16:33:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233990AbjEBQdc (ORCPT ); Tue, 2 May 2023 12:33:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234042AbjEBQdV (ORCPT ); Tue, 2 May 2023 12:33:21 -0400 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F4051704; Tue, 2 May 2023 09:33:17 -0700 (PDT) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 38A751FD72; Tue, 2 May 2023 16:33:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_rsa; t=1683045196; h=from:from:reply-to:reply-to:date:date:message-id:message-id:to:to: cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=HeRC7fA+3/8mFjpHJeO1WUYCKgF1yF5CAMdTzrG/j2w=; b=dSWBZnCKa4vZUzaWrpjmiSSIgBE4YwQsNvc7/NhwpxCPI7tOcJ1c4XVc9oozntvTnDsuGo 8DUzxtHUE+7Ch/r75a5aLIJHLIKmjre5Cx0PoASGEGBZrYMdixPduOC70KizqEt8K1Gi2d b0EjtdL/DLUoI3MA8w8ZOUteEnMI7Zs= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.cz; s=susede2_ed25519; t=1683045196; h=from:from:reply-to:reply-to:date:date:message-id:message-id:to:to: cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=HeRC7fA+3/8mFjpHJeO1WUYCKgF1yF5CAMdTzrG/j2w=; b=lPMSlWW0Tq86aGrcMM1G9rp5Eh4NtdBs2yCT52DJqnzMyjuxhy9to5epIHXv5Mzx8+GtL5 BZ8YF9VCqQx6uwBw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id E0217139C3; Tue, 2 May 2023 16:33:15 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id PWDHNUs7UWQjRAAAMHmgww (envelope-from ); Tue, 02 May 2023 16:33:15 +0000 Date: Tue, 2 May 2023 18:27:20 +0200 From: David Sterba To: kernel test robot Cc: Boris Burkov , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, David Sterba , linux-btrfs@vger.kernel.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com Subject: Re: [linus:master] [btrfs] 52bb7a2166: filebench.sum_operations/s -4.0% regression Message-ID: <20230502162720.GL8111@twin.jikos.cz> Reply-To: dsterba@suse.cz References: <202304292249.93ef60fb-oliver.sang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202304292249.93ef60fb-oliver.sang@intel.com> User-Agent: Mutt/1.5.23.1-rc1 (2014-03-12) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, Apr 29, 2023 at 10:29:00PM +0800, kernel test robot wrote: > > Hello, > > kernel test robot noticed a -4.0% regression of filebench.sum_operations/s on: > > > commit: 52bb7a2166af490317ce2cca1865b6630e86aca8 ("btrfs: introduce size class to block group allocator") > https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master The size classes are a heuristic, it may improve and worsen some workloads and also depends on actual layout of extents and block groups. So this is expected, -4% is within acceptable range.