From: David Sterba <dsterba@suse.cz>
To: Qu Wenruo <wqu@suse.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>,
kernel test robot <rong.a.chen@intel.com>,
David Sterba <dsterba@suse.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Leonard Lausen <leonard@lausen.nl>,
LKML <linux-kernel@vger.kernel.org>,
lkp@01.org
Subject: Re: [LKP] [btrfs] 8d47a0d8f7: fio.write_bw_MBps -28.6% regression
Date: Fri, 10 Apr 2020 12:14:06 +0200 [thread overview]
Message-ID: <20200410101406.GI5920@suse.cz> (raw)
In-Reply-To: <a52f10f7-cdf6-9b00-9e49-b1344c17a190@suse.com>
On Fri, Apr 10, 2020 at 02:44:55PM +0800, Qu Wenruo wrote:
> On 2020/4/10 下午2:34, Xing Zhengjun wrote:
> > Hi Wenruo,
> >
> > We test it in v5.6, the issue still exist, do you have time to take a
> > look at this? Thanks.
>
> This is expected.
>
> The extra check brings new overhead mostly equal to another CRC32 run.
>
> We believe it's worthy, as our read time tree checker has exposed quite
> some bit flip corruption.
The test probably runs on a PMEM device so there's no slowdown from the
actual IO and the in-memory checks are measurable, though 28% is a lot,
I'd expect something like 5-10% at most.
next prev parent reply other threads:[~2020-04-10 10:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-13 3:17 [btrfs] 8d47a0d8f7: fio.write_bw_MBps -28.6% regression kernel test robot
2020-04-10 6:34 ` [LKP] " Xing Zhengjun
2020-04-10 6:44 ` Qu Wenruo
2020-04-10 10:14 ` David Sterba [this message]
2020-04-13 8:19 ` Xing Zhengjun
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=20200410101406.GI5920@suse.cz \
--to=dsterba@suse.cz \
--cc=dsterba@suse.com \
--cc=leonard@lausen.nl \
--cc=linux-kernel@vger.kernel.org \
--cc=lkp@01.org \
--cc=rong.a.chen@intel.com \
--cc=torvalds@linux-foundation.org \
--cc=wqu@suse.com \
--cc=zhengjun.xing@linux.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