Re: [Patch] SCSI I/O statistics

From: Matthew Wilcox
Date: Tue Sep 26 2006 - 14:24:25 EST

On Tue, Sep 26, 2006 at 10:39:30AM -0700, Andrew Morton wrote:
> - Should it have been done at the block layer rather than at the scsi layer?

This was already mentioned when he sent it to linux-scsi a few days ago.
There are scsi commands which bypass the block layer, such as SG_IO, and
block layer stats can make an extremely busy disc look not busy.
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