linux-kernel - Re: [PATCH V4] scsi: target: tcmu: Make cmd_ring

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Date:   Sun, 27 Feb 2022 22:43:21 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Guixin Liu <kanie@...ux.alibaba.com>, bostroesser@...il.com
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        xlpang@...ux.alibaba.com, target-devel@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        xiaoguang.wang@...ux.alibaba.com
Subject: Re: [PATCH V4] scsi: target: tcmu: Make cmd_ring_size changeable via configfs

On Wed, 16 Feb 2022 10:21:49 +0800, Guixin Liu wrote:

> Make cmd_ring_size changeable similar to the way it is done for
> max_data_area_mb, the reason is that our tcmu client will create
> thousands of tcmu instances, and this will consume lots of mem with
> default 8Mb cmd ring size for every backstore.
> 
> One can change the value by typing:
>     echo "cmd_ring_size_mb=N" > control
> The "N" is a integer between 1 to 8, if set 1, the cmd ring can hold
> about 6k cmds(tcmu_cmd_entry about 176 byte) at least.
> 
> [...]

Applied to 5.18/scsi-queue, thanks!

[1/1] scsi: target: tcmu: Make cmd_ring_size changeable via configfs
      https://git.kernel.org/mkp/scsi/c/c7ede4f044b9

-- 
Martin K. Petersen	Oracle Linux Engineering