linux-kernel - Re: [PATCH 1/1] mmc: Set optimal I/O size when mmc_setip

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Date:   Sun, 27 Aug 2023 00:54:54 +0800
From:   <Sharp.Xia@...iatek.com>
To:     <wenchao.chen666@...il.com>
CC:     <Sharp.Xia@...iatek.com>,
        <angelogioacchino.delregno@...labora.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <linux-mmc@...r.kernel.org>,
        <matthias.bgg@...il.com>, <shawn.lin@...k-chips.com>,
        <ulf.hansson@...aro.org>, <wsd_upstream@...iatek.com>
Subject: Re: [PATCH 1/1] mmc: Set optimal I/O size when mmc_setip_queue

On Fri, 2023-08-25 at 20:23 +0800, Wenchao Chen wrote:
> 
> 
> Hi Sharp
> Use "echo 1024 > sys/block/mmcblk0/queue/read_ahead_kb" instead of
> "blk_queue_io_opt(mq->queue, host->max_req_size);"？

Hi Wenchao,

User space does not know the max_req_size of each mmc host.
And when the SD card is hot inserted,
it is complicated for the user space to modify this value.