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 5B75AC197A0 for ; Fri, 17 Nov 2023 14:12:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232069AbjKQOMd (ORCPT ); Fri, 17 Nov 2023 09:12:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230513AbjKQOMc (ORCPT ); Fri, 17 Nov 2023 09:12:32 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5A0C7C5 for ; Fri, 17 Nov 2023 06:12:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1700230348; h=from:from:reply-to:subject:subject: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=C+D0LhO6NECogVwI5g3Kwjiq5nOgvXFKjlmubrqlGHE=; b=D0DODdQ1QlQOmMGUzRONMyA/577l3sxd6vKkZyEZAbN208xymJoFJ0xAzzpbchMVPlmc/C 0hp3ta6CoaUONVrPlKP/UItAxEINOgGjBieru6kGmwgeSdU555X9kGFRr0Tg7n0rONi5VK +DM6z9xooupplr0DPYRKsaPBaJBohyo= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-365-wzdnngaRM4yo03wd8meQTQ-1; Fri, 17 Nov 2023 09:12:22 -0500 X-MC-Unique: wzdnngaRM4yo03wd8meQTQ-1 Received: from smtp.corp.redhat.com (int-mx09.intmail.prod.int.rdu2.redhat.com [10.11.54.9]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2D3B09758C1; Fri, 17 Nov 2023 14:12:20 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1AA58492BE0; Fri, 17 Nov 2023 14:12:17 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <20231117113549.GBZVdQFQ7VrfsPd9mV@fat_crate.local> References: <20231117113549.GBZVdQFQ7VrfsPd9mV@fat_crate.local> <20231116154406.GDZVY4xmFvRQt0wGGE@fat_crate.local> <202311061616.cd495695-oliver.sang@intel.com> <3865842.1700061614@warthog.procyon.org.uk> <20231115190938.GGZVUXcuUjI3i1JRAB@fat_crate.local> <232440.1700153046@warthog.procyon.org.uk> To: Borislav Petkov Cc: dhowells@redhat.com, Linus Torvalds , kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Christian Brauner , Alexander Viro , Jens Axboe , Christoph Hellwig , Christian Brauner , Matthew Wilcox , David Laight , ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com Subject: Re: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <864269.1700230337.1@warthog.procyon.org.uk> Date: Fri, 17 Nov 2023 14:12:17 +0000 Message-ID: <864270.1700230337@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.9 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Borislav Petkov wrote: > Hmm, stupid question: are those results better than without that > oneliner? Without any changes, I see something like: iov_kunit_benchmark_bvec: avg 3185 uS, stddev 19 uS iov_kunit_benchmark_bvec: avg 3186 uS, stddev 9 uS iov_kunit_benchmark_bvec: avg 3244 uS, stddev 153 uS iov_kunit_benchmark_bvec_split: avg 3397 uS, stddev 16 uS iov_kunit_benchmark_bvec_split: avg 3400 uS, stddev 16 uS iov_kunit_benchmark_bvec_split: avg 3402 uS, stddev 34 uS iov_kunit_benchmark_kvec: avg 2818 uS, stddev 550 uS iov_kunit_benchmark_kvec: avg 2906 uS, stddev 21 uS iov_kunit_benchmark_kvec: avg 2923 uS, stddev 1496 uS iov_kunit_benchmark_xarray: avg 3564 uS, stddev 6 uS iov_kunit_benchmark_xarray: avg 3573 uS, stddev 17 uS iov_kunit_benchmark_xarray: avg 3575 uS, stddev 58 uS iov_kunit_benchmark_xarray_to_bvec: avg 3929 uS, stddev 9 uS iov_kunit_benchmark_xarray_to_bvec: avg 3930 uS, stddev 6 uS iov_kunit_benchmark_xarray_to_bvec: avg 3930 uS, stddev 7 uS David