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From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: linux-mmc@vger.kernel.org
Subject: eMMC performance regression caused by 427b6514d0953bf
Date: Tue, 13 Oct 2020 19:08:50 +0800	[thread overview]
Message-ID: <20201013190851.715df9ad@xhacker.debian> (raw)

Hi,

I found an emmc performance regression with below simple benchmark cmd:

dd if=/dev/mmcblk0 of=/dev/null bs=8192 count=100000

This regression has been bisected to commit
427b6514d0953bf (“mmc: sdhci: Add Auto CMD Auto Select support”)

If I revert this commit, the performance is good now.

I’m not sure whether this is common issue or not.

Thanks

             reply	other threads:[~2020-10-13 11:09 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-13 11:08 Jisheng Zhang [this message]
2020-10-13 12:32 ` eMMC performance regression caused by 427b6514d0953bf Ulf Hansson
2020-10-13 13:23   ` Adrian Hunter
2020-10-14 10:32     ` [PATCH] mmc: sdhci: Use Auto CMD Auto Select only when v4_mode is true Jisheng Zhang
2020-10-14 19:44       ` Adrian Hunter
2020-10-15  2:12         ` Jisheng Zhang
2020-10-15  2:38           ` Jisheng Zhang
2020-10-15  5:57             ` Adrian Hunter
2020-10-15  6:24               ` Jisheng Zhang
2020-10-15  8:50                 ` Adrian Hunter
2020-10-14 10:42     ` eMMC performance regression caused by 427b6514d0953bf Jisheng Zhang

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