Re: Block timeouts seem not to be working

[Mike Anderson <andmike@linux.vnet.ibm.com>]

James Bottomley <James.Bottomley@HansenPartnership.com> wrote:
> I just noticed this with a rather finickey SAS system I have.  It's got
> a SATA DVD attached over an expander.  Periodically the DVD just hangs
> up, so we wait for the timeout and then send a phy reset which clears
> it.
> 
> What I'm seeing with the new block timer code is that the timer never
> expires.  I can dig some more into this, but if you wanted to test it as
> well, the timer code is easy to excite.  Just throw away one command in
> every 128 or so in the queuecommand routine of your favourite HBA
> driver.

I have not seen the case of the timer never expiring, but will look into
other test cases.

Mike C and I where seeing timeout issues (host staying in recovery state
or list debug bugon's) when running tests with timeouts set to 1 or 2
seconds. We are working with Jens to address this.  The issue we where
hitting appears related to the scsi_eh / scsi_done completion
synchronization.

-andmike
--
Michael Anderson
andmike@linux.vnet.ibm.com