> On Tue, Oct 13, 2020 at 10:11:13PM +0800, Wang Yugui wrote: > > Hi, > > > > dbench throughput on xfs over hardware limit(6Gb/s=750MB/s). > > > > Is this a bug or some feature of performance optimization? > > dbench measures page cache throughput, not physical IO throughput. > This sort of results is expected. We use 'dbench -s', so it should be physical IO. -s Use synchronous file IO on all file operations. we check 'dbench -s' with 'strace -ff -o s.log', we can see 'O_SYNC' in openat(). Best Regards Wang Yugui (wangyugui@xxxxxxxxxxxx) 2020/10/14
