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
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