Re: [linus:master] [xfs] c91d38b57f: stress-ng.chown.ops_per_sec 70.2% improvement

[Mateusz Guzik]

On Fri, Oct 03, 2025 at 09:56:15AM +0200, Christoph Hellwig wrote:
> On Thu, Oct 02, 2025 at 04:11:29PM +0800, kernel test robot wrote:
> > 
> > 
> > Hello,
> > 
> > kernel test robot noticed a 70.2% improvement of stress-ng.chown.ops_per_sec on:
> 
> I wonder what stress-ng shown is doing, because unless it is mixing fsync
> and ilock-heavy operations on the same node this would be highly
> unexpected.
> 

According to my strace there is no fsync, instead all of the worker
threads are issuing chown, lchown and fchown on the same inode.

As far as *benchmarking* goes this is useless.

Note stress-ng does not claim to be a benchmarking suite, but a stress
test suite which can also report ops/s for whatever it did.

This bit does not look particularly useful for stress testing either tbh.