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Thu, 29 Jun 2023 13:31:33 +0000 (GMT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3731.600.7\)) Subject: Re: [PATCH v2 0/9] Introduce SMT level and add PowerPC support From: Sachin Sant In-Reply-To: <87edluh6ce.fsf@mail.lhotse> Date: Thu, 29 Jun 2023 19:01:22 +0530 Cc: Laurent Dufour , linuxppc-dev , linux-arch@vger.kernel.org, dave.hansen@linux.intel.com, open list , Ingo Molnar , bp@alien8.de, npiggin@gmail.com, tglx@linutronix.de Content-Transfer-Encoding: quoted-printable Message-Id: References: <20230628100558.43482-1-ldufour@linux.ibm.com> <88E208A6-F4E0-4DE9-8752-C9652B978BC6@linux.ibm.com> <87edluh6ce.fsf@mail.lhotse> To: Michael Ellerman X-Mailer: Apple Mail (2.3731.600.7) X-TM-AS-GCONF: 00 X-Proofpoint-GUID: p9fIrhzuknG-wZ6s0tbFa0qN0XHpWfsu X-Proofpoint-ORIG-GUID: bil4KbMF-Z02xwvfg-W4hlsa2BwW-7Kw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-06-29_03,2023-06-27_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 mlxscore=0 adultscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 malwarescore=0 impostorscore=0 priorityscore=1501 mlxlogscore=999 clxscore=1015 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2306290122 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >>=20 >> Without this option but changing SMT level during runtime using >> ppc64_cpu =E2=80=94smt=3D, the SMT level is not retained after >> cpu core add. >=20 > That's because ppc64_cpu is not using the sysfs SMT control file, it's > just onlining/offlining threads manually. >=20 > If you run: > $ ppc64_cpu --smt=3D4=20 >=20 > And then also do: >=20 > $ echo 4 > /sys/devices/system/cpu/smt/control >=20 > It should work as expected? Thanks Michael. Yes this works. The SMT level is preserved after a core add. - Sachin