From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Douglas Gilbert <dgilbert@interlog.com>
Cc: linux-scsi@vger.kernel.org, martin.petersen@oracle.com,
hare@suse.de, bart.vanassche@wdc.com
Subject: Re: [PATCH v2] scsi_debug: implement IMMED bit
Date: Tue, 13 Feb 2018 21:29:07 -0500 [thread overview]
Message-ID: <yq1lgfwpamk.fsf@oracle.com> (raw)
In-Reply-To: <20180210023639.8280-1-dgilbert@interlog.com> (Douglas Gilbert's message of "Fri, 9 Feb 2018 21:36:39 -0500")
Doug,
> The Start Stop Unit (SSU) command takes in the order of a second to
> complete on some SAS SSDs and longer on hard disks. Synchronize Cache
> (SC) can also take some time. Both commands have an IMMED bit in their
> cdbs for those apps that don't want to wait. This patch introduces a
> long delay for those commands when the IMMED bit is clear. Since SC
> is a media access command then when the fake_rw option is active, its
> cdb processing is skipped and it returns immediately. The SSU command
> is not altered by the setting of the fake_rw option. These actions are
> not changed by this patch.
Applied to 4.17/scsi-queue. Thank you!
--
Martin K. Petersen Oracle Linux Engineering
prev parent reply other threads:[~2018-02-14 2:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-10 2:36 [PATCH v2] scsi_debug: implement IMMED bit Douglas Gilbert
2018-02-14 2:29 ` Martin K. Petersen [this message]
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