Re: [Patch] SCSI statistics

Arjan van de Ven
2006-09-18T21:28:52Z

On Mon, 2006-09-18 at 13:20 +0200, Martin Peschke wrote:
> This patch makes the SCSI mid layer report statistics data, i.e. request
> sizes, request latencies, request results and queue utilisation.
> For sample output please see below. This data is only gathered if these
> statistics have been enabled by users at run time (default is off).
>
> It is crucial (for us) to be able to look at such kernel level data in
> case of customer situations. It allows us to determine what kind of
> requests might be involved in performance situations. This information
> helps to understand whether one faces a device issue or a Linux issue.
> Not being able to tap into performance data is regarded as a big minus
> by some enterprise customers, who are reluctant to use Linux SCSI
> support or Linux.
>
> Patch is against 2.6.18-rc6-mm2, as it requires the statistics
> infrastructure patches.

wouldn't this be nicer as a block level functionality?

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