On 10/11/2013 01:18 AM, Shaohua Li wrote: > Using percpu-ida to manage blk-mq tags. the percpu-ida has similar algorithm > like the blk-mq-tag. The difference is when a cpu can't allocate tags > blk-mq-tag uses ipi to purge remote cpu cache and percpu-ida directly purges > remote cpu cache. In practice (testing null_blk), the percpu-ida approach is > much faster when total tags aren't enough.
I'm not surprised it's a lot faster the the pathological case of needing to prune tags, the IPI isn't near ideal for that. I'm assuming the general performance is the same for the non-full case? -- Jens Axboe -- 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/
