+ Adrian On Tue, 13 Oct 2020 at 13:09, Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx> wrote: > > 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. Can you provide some data, like how much is the regression and how many tests did you run? Did you try different block sizes of the dd command? Kind regards Uffe
