On 11/06/2020 04:07, Ming Lei wrote:
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: none sched: 2290K IOPS 894K mq-deadline sched: 2341K IOPS 2313K Final, host_tagset=0 in LLDD* none sched: 2289K IOPS 703K mq-deadline sched: 2337K IOPS 2291K Final: none sched: 2281K IOPS 1101K mq-deadline sched: 2322K IOPS 1278K * 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 for testing. A copy of the patches can be found here: https://github.com/hisilicon/kernel-dev/commits/private-topic-blk-mq-shared-tags-rfc-v7 And to progress this series, we the the following to go in first, when ready: https://lore.kernel.org/linux-scsi/20200430131904.5847-1-hare@xxxxxxx/I'd suggest to add options to enable shared tags for null_blk & scsi_debug in V8, so that it is easier to verify the changes without real hardware.
ok, fine, I can look at including that. To stop the series getting too large, I might spin off the early patches, which are not strictly related.
Thanks, John
