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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 D360CC6377A for ; Wed, 21 Jul 2021 21:16:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B4A6161009 for ; Wed, 21 Jul 2021 21:16:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229862AbhGUUgH (ORCPT ); Wed, 21 Jul 2021 16:36:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37702 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229748AbhGUUgH (ORCPT ); Wed, 21 Jul 2021 16:36:07 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59E9DC061575; Wed, 21 Jul 2021 14:16:43 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1626902202; 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=SRiajcVUG8kkXW77JkyefMeF62lPa2D1xRVh/uS1Pcc=; b=JsZSNBDhAtOGRXnmlDHSZO1xrzcJu8SnKp57KmfS1fAG6nAgrBz6aq/lo8/RGXsKA/m0a9 551fDtEVCTSy0XDd6EWOVhDe+WpVP2K5VgOm/rj9V5cFGgkn4uhHcARGIQgmRLEXkPg1Yq DgSkcBx249z+Xhyw3PzUZFfKRJaN0eUK7ipxyN3SeHFkG/7RJRVBzr66gH3hPItV1JUelD TvtWEgaSAH+niFBMNgODD9Zj1/yP44HNH8YiKMBPcMFa5EXxolPQMp8X5Oymhg8SNSgMKU oPBHxWNS5uKBjXoiEFXKmoDH1OfE76cj2dSEM8Crmgk/1zD31lGpT7SnyNQbIQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1626902202; 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=SRiajcVUG8kkXW77JkyefMeF62lPa2D1xRVh/uS1Pcc=; b=UsiW6dIfwJVshmwQ9U09Xm7AkT9BJE+2U91TClDH7AZTjO8PGGwkd2ONGYbjcYkvVOSBrV 96W3g5agpmUFMoAA== To: Dexuan Cui , Saeed Mahameed , Leon Romanovsky Cc: "linux-pci\@vger.kernel.org" , "'netdev\@vger.kernel.org'" , "'x86\@kernel.org'" , Haiyang Zhang , "'linux-kernel\@vger.kernel.org'" Subject: RE: [5.14-rc1] mlx5_core receives no interrupts with maxcpus=8 In-Reply-To: References: Date: Wed, 21 Jul 2021 23:16:41 +0200 Message-ID: <87czrbpdty.ffs@nanos.tec.linutronix.de> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Dexuan, On Mon, Jul 19 2021 at 20:33, Dexuan Cui wrote: > This is a bare metal x86-64 host with Intel CPUs. Yes, I believe the > issue is in the IOMMU Interrupt Remapping mechanism rather in the > NIC driver. I just don't understand why bringing the CPUs online and > offline can work around the issue. I'm trying to dump the IOMMU IR > table entries to look for any error. can you please enable GENERIC_IRQ_DEBUGFS and provide the output of cat /sys/kernel/debug/irq/irqs/$THENICIRQS Thanks, tglx