On 8/19/20 9:20 AM, John Garry wrote: > Hi all, > > Here is v8 of the patchset. > > In this version of the series, we keep the shared sbitmap for driver tags, > and introduce changes to fix up the tag budgeting across request queues. > We also have a change to count requests per-hctx for when an elevator is > enabled, as an optimisation. I also dropped the debugfs changes - more on > that below. > > Some performance figures: > > Using 12x SAS SSDs on hisi_sas v3 hw. mq-deadline results are included, > but it is not always an appropriate scheduler to use. > > Tag depth 4000 (default) 260** > > Baseline (v5.9-rc1): > none sched: 2094K IOPS 513K > mq-deadline sched: 2145K IOPS 1336K > > Final, host_tagset=0 in LLDD *, ***: > none sched: 2120K IOPS 550K > mq-deadline sched: 2121K IOPS 1309K > > Final ***: > none sched: 2132K IOPS 1185 > mq-deadline sched: 2145K IOPS 2097 > > * this is relevant as this is the performance in supporting but not > enabling the feature > ** depth=260 is relevant as some point where we are regularly waiting for > tags to be available. Figures were are a bit unstable here. > *** Included "[PATCH V4] scsi: core: only re-run queue in > scsi_end_request() if device queue is busy" > > A copy of the patches can be found here: > https://github.com/hisilicon/kernel-dev/tree/private-topic-blk-mq-shared-tags-v8 > > The hpsa patch depends on: > https://lore.kernel.org/linux-scsi/20200430131904.5847-1-hare@xxxxxxx/ > > And the smartpqi patch is not to be accepted. > > Comments (and testing) welcome, thanks! I applied 1-11, leaving the SCSI core bits and drivers to Martin. I can also carry them, just let me know. -- Jens Axboe
