From: mulyadi.santosa@gmail.com (Mulyadi Santosa)
To: kernelnewbies@lists.kernelnewbies.org
Subject: blktrace vs ftrace
Date: Thu, 9 Feb 2012 00:04:21 +0700 [thread overview]
Message-ID: <CAGdaadYKMSVJ8OxpF=EN5rOnjQkoNsUY7hpTCOPXqDQwAd_bbA@mail.gmail.com> (raw)
In-Reply-To: <4F32558E.3090804@gmail.com>
Hi Matthias...
On Wed, Feb 8, 2012 at 17:59, Matthias Brugger
<matthias.bgg@googlemail.com> wrote:
> If I understand the patch which introduces the blk tracer to ftrace
> (http://lwn.net/Articles/315508/) just uses the blktrace interface. So I
> wonder why using this influences the I/O behaviour.
Then I am completely clueless now. Better consult with qemu-devel mailing list.
PS: just crossed my mind, maybe ftrace that uses blktrace is actually
tracing the qemu's virtio. Whereas blktrace is tracing the physical
block access. This is just speculation, after re-reading that you use
virtio and disable write caching.
--
regards,
Mulyadi Santosa
Freelance Linux trainer and consultant
blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com
prev parent reply other threads:[~2012-02-08 17:04 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-02 10:20 blktrace vs ftrace Matthias Brugger
2012-02-02 18:15 ` Mulyadi Santosa
2012-02-02 19:06 ` Matthias Brugger
2012-02-03 5:59 ` Mulyadi Santosa
2012-02-08 10:59 ` Matthias Brugger
2012-02-08 17:04 ` Mulyadi Santosa [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='CAGdaadYKMSVJ8OxpF=EN5rOnjQkoNsUY7hpTCOPXqDQwAd_bbA@mail.gmail.com' \
--to=mulyadi.santosa@gmail.com \
--cc=kernelnewbies@lists.kernelnewbies.org \
/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).