linux-kernel - Re: [PATCH 5/6] hisi_sas: add hisi_sas_slave

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Date:	Tue, 16 Feb 2016 16:33:55 +0100
From:	Hannes Reinecke <hare@...e.de>
To:	John Garry <john.garry@...wei.com>, JBottomley@...n.com,
	martin.petersen@...cle.com
Cc:	linuxarm@...wei.com, zhangfei.gao@...aro.org, xuwei5@...ilicon.com,
	john.garry2@...l.dcu.ie, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] hisi_sas: add hisi_sas_slave_configure()

On 02/16/2016 01:22 PM, John Garry wrote:
> In high-datarate aging tests, it is found that
> the SCSI framework can periodically
> issue lu resets to the device. This is because scsi
> commands begin to timeout. It is found that TASK SET
> FULL may be returned many times for the same command,
> causing the timeouts.
> To overcome this, the queue depth for the device needs
> to be reduced to 64 (from 256, set in
> sas_slave_configure()).
> 
Hmm. TASK SET FULL should cause the queue depth to be reduced
automatically, no?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		   Teamlead Storage & Networking
hare@...e.de			               +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
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HRB 21284 (AG Nürnberg)