From: "Yin, Fengwei" <fengwei.yin@intel.com>
To: Dave Chinner <david@fromorbit.com>
Cc: kernel test robot <oliver.sang@intel.com>,
Dave Chinner <dchinner@redhat.com>,
"Darrick J. Wong" <djwong@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
<linux-xfs@vger.kernel.org>, <lkp@lists.01.org>, <lkp@intel.com>
Subject: Re: [LKP] Re: [xfs] 016a23388c: stress-ng.xattr.ops_per_sec 58.4% improvement
Date: Wed, 3 Aug 2022 22:11:02 +0800 [thread overview]
Message-ID: <8b9a5712-fbb1-afdf-6c5b-fa261832665f@intel.com> (raw)
In-Reply-To: <20220803010246.GB3600936@dread.disaster.area>
Hi Dave,
On 8/3/2022 9:02 AM, Dave Chinner wrote:
> That a single cacheline miss avoids all the spinlock contention is
> just pure luck - it'll come back if other work is being done on the
> machine that consumes enough memory bandwidth to push this back over
> the edge.
Agree. We did see some strange performance boost which can't be connected
to the code change. And worried later unrelated change reduce the
mysterious performance gain (and report it as regression).
Regards
Yin, Fengwei
prev parent reply other threads:[~2022-08-03 14:11 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-21 2:30 [xfs] 016a23388c: stress-ng.xattr.ops_per_sec 58.4% improvement kernel test robot
2022-07-21 22:01 ` Dave Chinner
2022-08-02 6:36 ` [LKP] " Yin, Fengwei
2022-08-03 1:02 ` Dave Chinner
2022-08-03 14:11 ` Yin, Fengwei [this message]
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=8b9a5712-fbb1-afdf-6c5b-fa261832665f@intel.com \
--to=fengwei.yin@intel.com \
--cc=david@fromorbit.com \
--cc=dchinner@redhat.com \
--cc=djwong@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=linux-xfs@vger.kernel.org \
--cc=lkp@intel.com \
--cc=lkp@lists.01.org \
--cc=oliver.sang@intel.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).