On Sat, 2017-09-16 at 00:44 +0800, Ming Lei wrote: > --------------------------------------- > |v4.13+ |v4.13+ > |+scsi_mq_perf |+scsi_mq_perf+patches > ----------------------------------------- > IOPS(K) |MQ-DEADLINE |MQ-DEADLINE > ------------------------------------------ > read | 30.71 | 343.91 > ----------------------------------------- > randread | 22.98 | 17.17 > ------------------------------------------ > write | 16.45 | 390.88 > ------------------------------------------ > randwrite | 16.21 | 16.09 > --------------------------------------- What is the reason for the random I/O performance regressions? Users whose workload triggers a random I/O pattern will be really unhappy with a 33% IOPS regression for random reads. Does that regression get worse for lower latency transports, e.g. SRP? Bart.
