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Clarke" To: Frederic Weisbecker Cc: Paul Menzel , Frederic Weisbecker , Thomas Gleixner , linuxppc-dev@lists.ozlabs.org, Ingo Molnar , LKML Subject: Re: ppc64le: `NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #20!!!` when turning off SMT Message-ID: References: <0baca95b-771f-2217-1098-2d0eee568ea7@molgen.mpg.de> <20220208131703.GA538566@lothringen> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220208131703.GA538566@lothringen> X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: IchAwxR61oGk0GZE9eikQPycGdF7avgf X-Proofpoint-GUID: rLUYCc53TXB1MU5eT9jJpepkvxp_L9gc X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2022-02-08_04,2022-02-07_02,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=720 impostorscore=0 phishscore=0 suspectscore=0 malwarescore=0 mlxscore=0 spamscore=0 priorityscore=1501 clxscore=1011 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2202080082 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Feb 08, 2022 at 02:17:03PM +0100, Frederic Weisbecker wrote: > On Tue, Feb 08, 2022 at 08:32:37AM +0100, Paul Menzel wrote: > > once warned about a NOHZ tick-stop error, when I executed `sudo > > /usr/sbin/ppc64_cpu --smt=off` (so that KVM would work). > > I see, so I assume this sets some CPUs offline, right? ppc64_cpu --smt=off sets all but the first CPU per core offline. PC