From: Dave Chinner <david@fromorbit.com>
To: Wang Yugui <wangyugui@e16-tech.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: dbench throughput on xfs over hardware limit(6Gb/s)
Date: Thu, 15 Oct 2020 08:24:58 +1100 [thread overview]
Message-ID: <20201014212458.GC7391@dread.disaster.area> (raw)
In-Reply-To: <20201014113211.2372.409509F4@e16-tech.com>
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@fromorbit.com
next prev parent reply other threads:[~2020-10-14 21:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-13 14:11 dbench throughput on xfs over hardware limit(6Gb/s) Wang Yugui
2020-10-13 23:05 ` Dave Chinner
2020-10-14 3:32 ` Wang Yugui
2020-10-14 21:24 ` Dave Chinner [this message]
2020-10-14 22:43 ` Wang Yugui
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201014212458.GC7391@dread.disaster.area \
--to=david@fromorbit.com \
--cc=linux-xfs@vger.kernel.org \
--cc=wangyugui@e16-tech.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).