Arjan van de Ven wrote:
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?
I won't mind as long as the data closely resembles the actual
I/O traffic to and from devices.
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