linux-kernel - RE: scsi-mq V2

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Date:	Fri, 11 Jul 2014 06:02:03 +0000
From:	"Elliott, Robert (Server Storage)" <Elliott@...com>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <axboe@...nel.dk>,
	"dgilbert@...erlog.com" <dgilbert@...erlog.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Bart Van Assche <bvanassche@...ionio.com>,
	Benjamin LaHaise <bcrl@...ck.org>,
	"linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: scsi-mq V2



> -----Original Message-----
> From: linux-scsi-owner@...r.kernel.org [mailto:linux-scsi-
> owner@...r.kernel.org] On Behalf Of Elliott, Robert (Server Storage)
> 
> I added some prints in aio_setup_ring and  ioctx_alloc and
> rebooted.  This time it took much longer to hit the problem.  It
> survived dozens of ^Cs.  Running a few minutes, though, IOPS
> eventually dropped.  So, sometimes it happens immediately,
> sometimes it takes time to develop.
> 
> I will rerun bisect-1 -2 and -3 for longer times to increase
> confidence that they didn't just appear good.

Allowing longer run times before declaring success, the problem 
does appear in all of the bisect trees.  I just let fio
continue to run for many minutes - no ^Cs necessary.

no-rebase: good for > 45 minutes (I will leave that running for
  8 more hours)
bisect-1: bad
bisect-2: bad
bisect-3: bad
bisect-4: bad


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