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=-3.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_NEOMUTT 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 A1150C43381 for ; Wed, 20 Mar 2019 11:51:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 79E122184E for ; Wed, 20 Mar 2019 11:51:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728099AbfCTLve (ORCPT ); Wed, 20 Mar 2019 07:51:34 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:35364 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726006AbfCTLvd (ORCPT ); Wed, 20 Mar 2019 07:51:33 -0400 Received: from bigeasy by Galois.linutronix.de with local (Exim 4.80) (envelope-from ) id 1h6Zkn-0002On-L1; Wed, 20 Mar 2019 12:51:29 +0100 Date: Wed, 20 Mar 2019 12:51:29 +0100 From: Sebastian Andrzej Siewior To: Juri Lelli Cc: tglx@linutronix.de, linux-rt-users@vger.kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, bristot@redhat.com, williams@redhat.com Subject: Re: [RFC PATCH RT] x86/tsc: Add option to disable tsc clocksource watchdog Message-ID: <20190320115129.neop27rzcepj5wvs@linutronix.de> References: <20190307120913.13168-1-juri.lelli@redhat.com> <20190314070951.GC31405@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190314070951.GC31405@localhost.localdomain> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2019-03-14 08:09:51 [+0100], Juri Lelli wrote: > Hi, > > On 07/03/19 13:09, Juri Lelli wrote: > > Clocksource watchdog has been found responsible for generating latency > > spikes (in the 10-20 us range) when woken up to check for TSC stability. > > > > Add an option to disable it at boot. > > Gentle ping. > > Does this make any sense? I have to reroute this ping to tglx since I wasn't involved. > Thanks, > > - Juri Sebastian