On Wed, May 12, 2021 at 4:47 PM Fox Chen <foxhlchen@xxxxxxxxx> wrote: > > Hi, > > I ran it on my benchmark (https://github.com/foxhlchen/sysfs_benchmark). > > machine: aws c5 (Intel Xeon with 96 logical cores) > kernel: v5.12 > benchmark: create 96 threads and bind them to each core then run > open+read+close on a sysfs file simultaneously for 1000 times. > result: > Without the patchset, an open+read+close operation takes 550-570 us, > perf shows significant time(>40%) spending on mutex_lock. > After applying it, it takes 410-440 us for that operation and perf > shows only ~4% time on mutex_lock. > > It's weird, I don't see a huge performance boost compared to v2, even I meant I don't see a huge performance boost here and it's way worse than v2. IIRC, for v2 fastest one only takes 40us > though there is no mutex problem from the perf report. > I've put console outputs and perf reports on the attachment for your reference. > > > thanks, > fox fox
