Messages in this thread | | | From | Fox Chen <> | Date | Wed, 12 May 2021 16:54:07 +0800 | Subject | Re: [PATCH v4 0/5] kernfs: proposed locking and concurrency improvement |
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On Wed, May 12, 2021 at 4:47 PM Fox Chen <foxhlchen@gmail.com> 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
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