On Thu, 12 Feb 2015, Jesper Dangaard Brouer wrote: > Measured on my laptop CPU i7-2620M CPU @ 2.70GHz: > > * 12.775 ns - "clean" spin_lock_unlock > * 21.099 ns - irqsave variant spinlock > * 22.808 ns - "manual" irqsave before spin_lock > * 14.618 ns - "manual" local_irq_disable + spin_lock > > Reproducible via my github repo: > > https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/lib/time_bench_sample.c > > The clean spin_lock_unlock is 8.324 ns faster than irqsave variant. > The irqsave variant is actually faster than expected, as the measurement > of an isolated local_irq_save_restore were 13.256 ns.
I am using spin_lock_irq() in the current version on my system. If the performance of that is a problem then please optimize that function. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
