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]
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