On Tue, 2017-08-29 at 19:16 +0800, Ming Lei wrote: > Hi Bart, > > Did you see perf regression on SRP with smaller jobs after applying > my patchset V3? > > I just run the test with 16 jobs(the system has 16 CPU cores) instead of 64, > looks not see perf regression on SRP about v4.13-rc6+blk-next(2nd column) VS. > v4.13-rc6+blk-next+patch V3(3rd column): > > > --------------------------------------- > IOPS(K) | NONE | NONE > --------------------------------------- > read | 475.83 | 485.88 > --------------------------------------- > randread | 142.86 | 141.96 > --------------------------------------- > write | 483.9 | 492.39 > --------------------------------------- > randwrite | 124.83 | 124.53 > --------------------------------------- > [ ... ] > --------------------------------------- > LAT(us) | NONE | NONE > --------------------------------------- > read | 2.15 | 2.11 > --------------------------------------- > randread | 7.17 | 7.21 > --------------------------------------- > write | 2.11 | 2.08 > --------------------------------------- > randwrite | 8.2 | 8.22 > --------------------------------------- > [ ... ] Hello Ming, Although I would prefer to see measurement data against an SRP target system that supports a higher workload (>1M IOPS) and also for a high-end NVMe drive, I think the above data is sufficient to show that the performance impact of your patch series is most likely small enough even for high-end SCSI initiator drivers. Bart.
