On 06/06/2014 01:01 PM, Sam Bradshaw wrote: > This patch adds the following: > > 1) Compiler hinting in the fast path. > 2) A prefetch of port->flags to eliminate moderate cpu stalling later > in mtip_hw_submit_io(). > 3) Eliminate a redundant rq_data_dir(). > 4) Reorder members of driver_data to eliminate false cacheline sharing > between irq_workers_active and unal_qdepth. > > With some workload and topology configurations, I'm seeing ~1.5% > throughput improvement in small block random read benchmarks as well > as improved latency std. dev.
Seems I got a small bump in peak perf as well. In any case, it's innocuous, so should do no harm to apply. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
