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From: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
To: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>,
	Mike Snitzer <snitzer@redhat.com>
Cc: dm-devel@redhat.com,
	"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: Re: multipath_busy() stalls IO due to scsi_host_is_busy()
Date: Tue, 22 May 2012 13:31:36 +0900	[thread overview]
Message-ID: <4FBB16A8.1020401@ce.jp.nec.com> (raw)
In-Reply-To: <4FBA6281.3040109@itwm.fraunhofer.de>

Hi,

On 05/22/12 00:42, Bernd Schubert wrote:
> On 05/17/2012 11:09 AM, Jun'ichi Nomura wrote:
>> However, when it is target/host that is busy, I think dm should
>> send the request down and let SCSI, which has better knowledge
>> about the shared resource, do appropriate starvation control.
>>
>> Could you try the attached patch?
...
> Thanks, that works fine! I had something else in my mind for multipath, but if this can go into scsi we don't need the multipath patch anymore.
> Are you going to officially submit it (missing signed-off)?

Thank you for testing.
Yes, I'll submit it officially with your Reported-by/Tested-by.

Also, a note suggested by Mike Snitzer will be added to the
patch description. (Thanks Mike.)

-- 
Jun'ichi Nomura, NEC Corporation

      reply	other threads:[~2012-05-22  4:31 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-05-16 12:28 multipath_busy() stalls IO due to scsi_host_is_busy() Bernd Schubert
2012-05-16 14:06 ` James Bottomley
2012-05-16 14:29   ` Bernd Schubert
2012-05-16 15:27     ` [dm-devel] " Mike Christie
     [not found]       ` <4FB3C75F.3070903-hcNo3dDEHLuVc3sceRu5cw@public.gmane.org>
2012-05-16 15:54         ` Bernd Schubert
     [not found]           ` <4FB3CDC5.9040608-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
2012-05-16 17:03             ` David Dillow
2012-05-16 20:34               ` Bernd Schubert
2012-05-21 15:49               ` [PATCH] srp: convert SRP_RQ_SHIFT into a module parameter Bernd Schubert
     [not found]                 ` <4FBA6412.7040505-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
2012-05-21 19:35                   ` Bernd Schubert
2012-05-30  5:22                   ` David Dillow
     [not found]                     ` <1338355352.2361.24.camel-1q1vX8mYZiGLUyTwlgNVppKKF0rrzTr+@public.gmane.org>
2012-05-30  5:24                       ` David Dillow
2012-05-17  9:09 ` multipath_busy() stalls IO due to scsi_host_is_busy() Jun'ichi Nomura
2012-05-17 13:46   ` Mike Snitzer
2012-05-21 15:42   ` Bernd Schubert
2012-05-22  4:31     ` Jun'ichi Nomura [this message]

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