On 5/30/18 1:26 AM, Jianchao Wang wrote: > Hi Jens > > This is the 3rd version patchset to make the kyber io scheduler more firendly > with merging. > > Most of time, kyber io scheduler will not leave any requests in ctx rq_list, > this is because even if tokens of one domain is used up, kyber will try to > dispatch requests from other domain and flush the rq_list there. So there is not > any change to do merge. > > To improve this, setup kyber_ctx_queue (kcq) which is similar with blk_mq_ctx but has > rq_list for every domain, and build mapping between kcq and khd as ctx and hctx. > Then we could merge, insert and dispatch on rq_list of different domains separately. > At the same time, only flush the rq_list of kcq after get domain token > successfully, then the requests could be left in the rq_list of that domain and > maybe merged with following io. In my local test on NVMe card, the sequential io > performance could be improved a lot, especially on high workload. More details > please refer to the second patch. Great work, thanks Jianchao - applied for 4.18. -- Jens Axboe
