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=-11.6 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=no 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 77F04C433E0 for ; Wed, 12 Aug 2020 03:27:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 56CB7207F7 for ; Wed, 12 Aug 2020 03:27:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="vo/NYDf5" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726537AbgHLD10 (ORCPT ); Tue, 11 Aug 2020 23:27:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57802 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726457AbgHLD1Z (ORCPT ); Tue, 11 Aug 2020 23:27:25 -0400 Received: from mail-io1-xd43.google.com (mail-io1-xd43.google.com [IPv6:2607:f8b0:4864:20::d43]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 98C99C06174A for ; Tue, 11 Aug 2020 20:27:25 -0700 (PDT) Received: by mail-io1-xd43.google.com with SMTP id b17so1132942ion.7 for ; Tue, 11 Aug 2020 20:27:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=Cv6To1xNei0LLSRiva8c4SLTVO9JByqhYIOzxANOVmM=; b=vo/NYDf5EO76pUdtg/nXluMxyZJR7eqK6UO8w5L4u4VDSsNdWTUWrScRabn/oXg7Ub gX5Su+JInfI4G+tFrGd+FMa7kyfuAQHVo/r1SQDotiGnKu8zrtT7BpYZXaAQMdodtDkm MEUy9xgCvKCWI6C1hJb34+CaaMEU+kGPSIo+ZsHAt0n2BqbJgSKRSp/mDCgAZjpPCORQ u4+wWsllmOFlaIy8T+l9i6B/WtkMHjXpin21BmcBrr0gdpDPXqKQYAevzFB6XJUUKowX OpOR0DlqdttORw0QT1ApK2mlGFK/bXnWyGmmRGF3BG7NGWeW8VJTr3s7PVvl4LEQecxf KjZA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=Cv6To1xNei0LLSRiva8c4SLTVO9JByqhYIOzxANOVmM=; b=b7bi8/qGkaoaE9g4K0NqT83narFDyMkIJ1GicxiFk9PVD0CVl4qwCftss7V20sZGtN qEgQVaJQRhsE3PtPk41NBuO3YsqiBzigd9SEzPhpd24v4CQZzZtztgVv199Z9DebRxe9 z0g6oocijNU880yxdaLD0gkNJpGYIm42Kk1Esnxo8HQUbOPLqsAvPnbwKNihfhi8ExHB 5f3gkrXWq7cXaXkiAqGR0JFq2rFU1E7FITdVB9bXzWFWNHb+AWFY2SPfdwmdauEYQFbO XRfgvFzSMY674oXDqTesO9Z91WC5Er7+TPxXcZt8kRJNcPBch3y2inBZGz1j00+2nWA+ rINA== X-Gm-Message-State: AOAM533u/xUW5VSMFqQ16LL4erEc3s+429BjSHr6Av4Hxv7Tojj2mbUq nO2UYJ/iEsu8DMDIVnGch01NY5J+kX0l6NsyDN/lEA== X-Google-Smtp-Source: ABdhPJzPTBOXHr56a6SrA6qfDjHF2POSJq8d6hpPREAN9oE9FoOZnS8qftZUA6VdsdmLJfW+z2H0i3IZkpmIJH54NMU= X-Received: by 2002:a6b:b356:: with SMTP id c83mr23217222iof.99.1597202844404; Tue, 11 Aug 2020 20:27:24 -0700 (PDT) MIME-Version: 1.0 References: <20200812013440.851707-1-edumazet@google.com> <5b61d241-fedb-f694-c0a1-e46b0dedab66@gmail.com> In-Reply-To: From: Eric Dumazet Date: Tue, 11 Aug 2020 20:27:13 -0700 Message-ID: Subject: Re: [PATCH net] net: accept an empty mask in /sys/class/net/*/queues/rx-*/rps_cpus To: David Ahern Cc: =?UTF-8?Q?Maciej_=C5=BBenczykowski?= , "David S . Miller" , netdev , Eric Dumazet , Alex Belits , Nitesh Narayan Lal , Peter Zijlstra Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On Tue, Aug 11, 2020 at 8:22 PM David Ahern wrote: > > On 8/11/20 9:19 PM, Maciej =C5=BBenczykowski wrote: > > Before breakage, post fix: > > > > sfp6:~# echo 0 > /sys/class/net/lo/queues/rx-0/rps_cpus > > > > With breakage: > > lpk17:~# echo 0 > /sys/class/net/lo/queues/rx-0/rps_cpus > > -bash: echo: write error: Invalid argument > > > > ah, so this is recent breakage with 5.9. I had not hit before hence the > question. thanks for clarifying. Yup, 07bbecb34106 ("net: Restrict receive packets queuing to housekeeping CPUs") has been merged only recently. (This was not in David net-next tree btw, this is why it took us so long to come to this issue)