Re: [LKP] Re: [ext4] d3b6f23f71: stress-ng.fiemap.ops_per_sec -60.5% regression

2020-08-19 Thread Theodore Y. Ts'o
Looking at what the stress-ng fiemap workload is doing, and it's interesting. It is running 4 processes which are calling FIEMAP on a particular file in a loop, with a 25ms sleep every 64 times. And then there is a fifth process which is randomly writing to the file and calling punch_hole to

Re: [LKP] Re: [ext4] d3b6f23f71: stress-ng.fiemap.ops_per_sec -60.5% regression

2020-08-18 Thread Xing Zhengjun
On 7/22/2020 2:17 PM, Xing Zhengjun wrote: On 7/15/2020 7:04 PM, Ritesh Harjani wrote: Hello Xing, On 4/7/20 1:30 PM, kernel test robot wrote: Greeting, FYI, we noticed a -60.5% regression of stress-ng.fiemap.ops_per_sec due to commit: commit: