Messages in this thread | | | Date | Mon, 1 Jul 2013 23:46:00 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH 3/5] metag: smp: don't spin waiting for CPU to start |
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On Mon, 1 Jul 2013, James Hogan wrote: > Use a completion to block until a secondary CPU has started up, like ARM > do, instead of a loop of udelays. > > On Meta, SMP is really SMT, with each "CPU" being a different hardware > thread on the same Meta processor core, so as well as being more > efficient and latency friendly, using a completion prevents the bogomips > of the secondary CPU from being drastically skewed every time by the > execution of the tight in-cache udelay loop on the other CPU.
The least of our worries is the correctness of bogomips. But if that patch makes bogomips less bogus while fixing a real issue, please add my
Acked-by: Thomas Gleixner <tglx@linutronix.de>
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