From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH 5/6] hisi_sas: add hisi_sas_slave_configure() Date: Tue, 16 Feb 2016 16:33:55 +0100 Message-ID: <56C34163.70606@suse.de> References: <1455625351-165881-1-git-send-email-john.garry@huawei.com> <1455625351-165881-6-git-send-email-john.garry@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1455625351-165881-6-git-send-email-john.garry@huawei.com> Sender: linux-kernel-owner@vger.kernel.org To: John Garry , JBottomley@odin.com, martin.petersen@oracle.com Cc: linuxarm@huawei.com, zhangfei.gao@linaro.org, xuwei5@hisilicon.com, john.garry2@mail.dcu.ie, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-scsi@vger.kernel.org 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()). >=20 Hmm. TASK SET FULL should cause the queue depth to be reduced automatically, no? Cheers, Hannes --=20 Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: F. Imend=F6rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N=FCrnberg)