From: Martin Peschke <mp3@de.ibm.com>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Arjan van de Ven <arjan@infradead.org>, linux-scsi@vger.kernel.org
Subject: Re: [Patch] SCSI statistics
Date: Tue, 19 Sep 2006 18:48:30 +0200 [thread overview]
Message-ID: <45101F5E.2070909@de.ibm.com> (raw)
In-Reply-To: <20060918213424.GS2585@parisc-linux.org>
Matthew Wilcox wrote:
> On Mon, Sep 18, 2006 at 11:28:32PM +0200, Arjan van de Ven wrote:
>> wouldn't this be nicer as a block level functionality?
>
> We already have block layer statistics.
you mean disk_stats_read() etc. in genhd?
> What we don't have are stats
> that measure the other ways to send commands to scsi devices like SG and
> retries that the scsi system does without notifying the block layer. I
> think both are useful (although at first glance they seem redundant).
There are no statistics that allow to retrieve data similar to my patch,
with the exception of blktrace. But I think blktrace is difficult to use
as sole performance analysis tool on a customer's system with high load
and applications competing with blktrace postprocessing tools.
next prev parent reply other threads:[~2006-09-19 16:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-09-18 11:20 [Patch] SCSI statistics Martin Peschke
2006-09-18 21:28 ` Arjan van de Ven
2006-09-18 21:34 ` Matthew Wilcox
2006-09-19 16:48 ` Martin Peschke [this message]
2006-09-19 16:33 ` Martin Peschke
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=45101F5E.2070909@de.ibm.com \
--to=mp3@de.ibm.com \
--cc=arjan@infradead.org \
--cc=linux-scsi@vger.kernel.org \
--cc=matthew@wil.cx \
/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