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 X-Spam-Level: X-Spam-Status: No, score=-10.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9088FC433DF for ; Mon, 10 Aug 2020 15:25:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 68CCE21775 for ; Mon, 10 Aug 2020 15:25:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597073151; bh=yDP87lINzHFiLkOkm6RlyKNPAAeN6uTzlS7Nkl4gNvc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qCmBRAqYcrs6NEsz/Hq+HzTu/XQuJlsxlan77DP+UQTsijPNZFUkwRLwkhIBdXXqN FxvO38CQbPWj2cy7UYzMBbZahKSogE313As3TSNnpFWTvOq2PxygyK18/4bNlgRJjY 3/F1mVUo9YlObxfCGmxWmJ3xTR00MkCoK/+W/eOE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728589AbgHJPZu (ORCPT ); Mon, 10 Aug 2020 11:25:50 -0400 Received: from mail.kernel.org ([198.145.29.99]:59710 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728573AbgHJPZt (ORCPT ); Mon, 10 Aug 2020 11:25:49 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8B1A920658; Mon, 10 Aug 2020 15:25:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597073149; bh=yDP87lINzHFiLkOkm6RlyKNPAAeN6uTzlS7Nkl4gNvc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=arUcv6Yc5KerwrtgaezAI6/ebW/fvugb6I9bVcrmMq3V13iC5RKt8tBE9sTwbHFKl hqOPKr4c0zHaaNrmRyvzhL31PtVhAbuZjbQp/XV/znPpM1EjWK9VjxYRisDZ4bLfKl i38XAwfS0viLZVvWbiQ0kbXgw5NcrMvKgiSYG4VI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Willem de Bruijn , "David S. Miller" Subject: [PATCH 5.7 74/79] selftests/net: relax cpu affinity requirement in msg_zerocopy test Date: Mon, 10 Aug 2020 17:21:33 +0200 Message-Id: <20200810151815.872093726@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200810151812.114485777@linuxfoundation.org> References: <20200810151812.114485777@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Willem de Bruijn [ Upstream commit 16f6458f2478b55e2b628797bc81a4455045c74e ] The msg_zerocopy test pins the sender and receiver threads to separate cores to reduce variance between runs. But it hardcodes the cores and skips core 0, so it fails on machines with the selected cores offline, or simply fewer cores. The test mainly gives code coverage in automated runs. The throughput of zerocopy ('-z') and non-zerocopy runs is logged for manual inspection. Continue even when sched_setaffinity fails. Just log to warn anyone interpreting the data. Fixes: 07b65c5b31ce ("test: add msg_zerocopy test") Reported-by: Colin Ian King Signed-off-by: Willem de Bruijn Acked-by: Colin Ian King Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- tools/testing/selftests/net/msg_zerocopy.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/tools/testing/selftests/net/msg_zerocopy.c +++ b/tools/testing/selftests/net/msg_zerocopy.c @@ -125,9 +125,8 @@ static int do_setcpu(int cpu) CPU_ZERO(&mask); CPU_SET(cpu, &mask); if (sched_setaffinity(0, sizeof(mask), &mask)) - error(1, 0, "setaffinity %d", cpu); - - if (cfg_verbose) + fprintf(stderr, "cpu: unable to pin, may increase variance.\n"); + else if (cfg_verbose) fprintf(stderr, "cpu: %u\n", cpu); return 0;