Hi Christian Loehle, > -----Original Message----- > From: Christian Loehle <CLoehle@xxxxxxxxxxxxxx> > Sent: Tuesday, April 18, 2023 8:48 AM > To: Richard Weinberger <richard@xxxxxx>; Biju Das > <biju.das.jz@xxxxxxxxxxxxxx> > Cc: linux-mmc <linux-mmc@xxxxxxxxxxxxxxx>; linux-renesas-soc <linux-renesas- > soc@xxxxxxxxxxxxxxx>; wsa+renesas <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>; ulf > hansson <ulf.hansson@xxxxxxxxxx> > Subject: RE: Poor write performance to boot area using rcar-gen3-sdhi > > Your eMMC likely treats the boot partitions differently than the user area, > e.g. in regards to cache. Boot partition is set by TF-A[1]. How does it differs from one used in Linux? [1] https://elixir.bootlin.com/arm-trusted-firmware/v2.8.0/source/drivers/renesas/common/io/io_emmcdrv.c#L169 Cheers, Biju > Is this reproducible for more 4k writes? What about larger writes? > The eMMC might not even have the mapping available after boot and first has > to internally switch to it, in contrast to at u-boot stage? > > Anyway this is probably more a question to your eMMC manufacturer and > nothing the host is to be blamed, as you mentioned yourself, the time is > spent at CMD25. > > -----Original Message----- > From: Richard Weinberger <richard@xxxxxx> > Sent: Tuesday, April 18, 2023 8:16 AM > To: Biju Das <biju.das.jz@xxxxxxxxxxxxxx> > Cc: linux-mmc <linux-mmc@xxxxxxxxxxxxxxx>; linux-renesas-soc <linux-renesas- > soc@xxxxxxxxxxxxxxx>; wsa+renesas <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>; ulf > hansson <ulf.hansson@xxxxxxxxxx> > Subject: Re: Poor write performance to boot area using rcar-gen3-sdhi > > ----- Ursprüngliche Mail ----- > > Von: "Biju Das" <biju.das.jz@xxxxxxxxxxxxxx> Not sure, the file system > > used between /dev/mmcblk1boot1 and /dev/mmcblk1p13 is making > > difference at Linux? > > > > I have seen performance difference between FAT and ext4. > > There is no filesystem, I'm writing directly using dd to the raw block > device. > > Thanks, > //richard > > Hyperstone GmbH | Reichenaustr. 39a | 78467 Konstanz Managing Director: Dr. > Jan Peter Berns. > Commercial register of local courts: Freiburg HRB381782
