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From: Sachin Sant <sachinp@linux.ibm.com>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Laurent Dufour <ldufour@linux.ibm.com>,
	linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
	linux-arch@vger.kernel.org, dave.hansen@linux.intel.com,
	open list <linux-kernel@vger.kernel.org>,
	Ingo Molnar <mingo@redhat.com>,
	bp@alien8.de, npiggin@gmail.com, tglx@linutronix.de
Subject: Re: [PATCH v2 0/9]  Introduce SMT level and add PowerPC support
Date: Thu, 29 Jun 2023 19:01:22 +0530	[thread overview]
Message-ID: <E68433D6-F103-4B58-A0DC-AD1099F8CC05@linux.ibm.com> (raw)
In-Reply-To: <87edluh6ce.fsf@mail.lhotse>


>> 
>> Without this option but changing SMT level during runtime using
>> ppc64_cpu —smt=<level>, the SMT level is not retained after
>> cpu core add.
> 
> That's because ppc64_cpu is not using the sysfs SMT control file, it's
> just onlining/offlining threads manually.
> 
> If you run:
> $ ppc64_cpu --smt=4 
> 
> And then also do:
> 
> $ echo 4 > /sys/devices/system/cpu/smt/control
> 
> It should work as expected?

Thanks Michael. Yes this works. The SMT level is preserved
after a core add.

- Sachin

      parent reply	other threads:[~2023-06-29 13:32 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-06-28 10:05 Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 1/9] cpu/SMT: Move SMT prototypes into cpu_smt.h Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 2/9] cpu/SMT: Move smt/control simple exit cases earlier Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 3/9] cpu/SMT: Store the current/max number of threads Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 4/9] cpu/SMT: Remove topology_smt_supported() Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 5/9] cpu/SMT: Create topology_smt_thread_allowed() Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 6/9] cpu/SMT: Allow enabling partial SMT states via sysfs Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 7/9] powerpc/pseries: Initialise CPU hotplug callbacks earlier Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 8/9] powerpc: Add HOTPLUG_SMT support Laurent Dufour
2023-06-28 10:05 ` [PATCH v2 9/9] powerpc/pseries: Honour current SMT state when DLPAR onlining CPUs Laurent Dufour
2023-06-28 15:33 ` [PATCH v2 0/9] Introduce SMT level and add PowerPC support Sachin Sant
2023-06-29 11:10   ` Michael Ellerman
2023-06-29 12:04     ` Laurent Dufour
2023-06-29 13:31     ` Sachin Sant [this message]

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