Re: dbench throughput on xfs over hardware limit(6Gb/s)

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On Wed, Oct 14, 2020 at 11:32:11AM +0800, Wang Yugui wrote:
> 
> > 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.

Reads can still be served from the page cache without doing physical
IO.

Cheers,

Dave.
-- 
Dave Chinner
david@xxxxxxxxxxxxx



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