From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Sumanesh Samanta <sumanesh.samanta@broadcom.com>
Cc: linux-scsi@vger.kernel.org,
"Martin K. Petersen" <martin.petersen@oracle.com>
Subject: Re: [PATCH 5/6] scsi: core: don't limit per-LUN queue depth for SSD when HBA needs
Date: Thu, 23 Jan 2020 20:58:30 -0500 [thread overview]
Message-ID: <yq1iml1ehtl.fsf@oracle.com> (raw)
In-Reply-To: <ab676c4c-03fb-7eb9-6212-129eb83d0ee8@broadcom.com> (Sumanesh Samanta's message of "Thu, 23 Jan 2020 17:01:47 -0700")
Sumanesh,
> The high-end controllers might expose a SCSI interface, but can have
> all kind of devices (NVMe/SCSI/SATA) behind it, and has its own
> capability to queue IO and feed to devices as needed. Those devices
> should not be penalized with the overhead of the device_busy counter,
> just because they chose to expose themselves has SCSI devices (for
> historical and backward compatibility reasons).
Please read what I proposed. megaraid VDs don't report QUEUE_FULL so you
would not trigger the device_busy counter.
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2020-01-24 1:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-19 7:14 [PATCH 0/6] scsi: support bypass device busy check for some high end HBA with SSD Ming Lei
2020-01-19 7:14 ` [PATCH 1/6] scsi: mpt3sas: don't use .device_busy in device reset routine Ming Lei
2020-01-19 20:28 ` Bart Van Assche
2020-01-19 7:14 ` [PATCH 2/6] scsi: remove .for_blk_mq Ming Lei
2020-01-19 20:29 ` Bart Van Assche
2020-01-20 10:17 ` John Garry
2020-01-20 22:12 ` Elliott, Robert (Servers)
2020-01-31 6:30 ` Christoph Hellwig
2020-02-05 2:13 ` Martin K. Petersen
2020-01-19 7:14 ` [PATCH 3/6] scsi: sd: register request queue after sd_revalidate_disk is done Ming Lei
2020-01-19 20:36 ` Bart Van Assche
2020-01-19 7:14 ` [PATCH 4/6] block: freeze queue for updating QUEUE_FLAG_NONROT Ming Lei
2020-01-19 20:40 ` Bart Van Assche
2020-01-19 7:14 ` [PATCH 5/6] scsi: core: don't limit per-LUN queue depth for SSD when HBA needs Ming Lei
2020-01-19 20:58 ` Bart Van Assche
2020-01-21 4:52 ` Martin K. Petersen
2020-01-23 2:54 ` Ming Lei
2020-01-24 1:21 ` Martin K. Petersen
2020-01-24 1:59 ` Ming Lei
2020-01-24 12:43 ` Sumit Saxena
2020-01-28 4:04 ` Martin K. Petersen
2020-01-24 0:01 ` Sumanesh Samanta
2020-01-24 1:58 ` Martin K. Petersen [this message]
2020-01-24 19:41 ` Sumanesh Samanta
2020-01-28 4:22 ` Martin K. Petersen
2020-01-31 11:39 ` Ming Lei
2020-01-19 7:14 ` [PATCH 6/6] scsi: megaraid: set flag of no_device_queue_for_ssd Ming Lei
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