Hi Oliver, I start performance tests for eMMC, SD/MMC, USB, SATA SSD devices and will post the result when ready.
As a beginning I can say that eMMC is accessed via 4-bit bus without matter of the patch used. There you are the content of /sys/kernel/debug/mmcX/ios (where X is number of eMMC or SD/MMC device). Booted from SD card with 8-bit patched kernel root@egpr:~# dmesg | grep mmc [ 3.599625] sunxi-mmc 1c0f000.mmc: Got CD GPIO [ 3.631883] sunxi-mmc 1c0f000.mmc: base:0xf08da000 irq:26 [ 3.669058] mmc0: host does not support reading read-only switch, assuming write-enable [ 3.671674] sunxi-mmc 1c11000.mmc: base:0xf08de000 irq:27 [ 3.672064] mmc0: new high speed SDHC card at address 0007 [ 3.673068] mmcblk0: mmc0:0007 SD04G 3.71 GiB [ 3.674785] mmcblk0: p1 [ 3.682261] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 8, RTO !! [ 3.689280] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.690146] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.690977] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.691808] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.745505] mmc1: MAN_BKOPS_EN bit is not set [ 3.749187] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 8, RD EBE !! [ 3.749229] sunxi-mmc 1c11000.mmc: data error, sending stop command [ 3.749247] sunxi-mmc 1c11000.mmc: send stop command failed [ 3.749268] mmc1: switch to bus width 2 failed [ 3.753586] mmc1: new high speed MMC card at address 0001 [ 3.754479] mmcblk1: mmc1:0001 P1XXXX 3.60 GiB [ 3.754961] mmcblk1boot0: mmc1:0001 P1XXXX partition 1 16.0 MiB [ 3.755604] mmcblk1boot1: mmc1:0001 P1XXXX partition 2 16.0 MiB [ 3.757045] mmcblk1: p1 [ 4.216879] EXT4-fs (mmcblk0p1): mounted filesystem with writeback data mode. Opts: (null) [ 7.907002] EXT4-fs (mmcblk0p1): re-mounted. Opts: commit=600,errors= remount-ro root@egpr:~# cat /sys/kernel/debug/mmc0/ios clock: 50000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 2 (sd high-speed) signal voltage: 0 (3.30 V) driver type: 0 (driver type B) root@egpr:~# cat /sys/kernel/debug/mmc1/ios clock: 50000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 1 (mmc high-speed) signal voltage: 0 (3.30 V) driver type: 0 (driver type B) Booted from SATA SSD with 4-bit patched kernel [ 3.598868] sunxi-mmc 1c0f000.mmc: Got CD GPIO [ 3.631154] sunxi-mmc 1c0f000.mmc: base:0xf08da000 irq:26 [ 3.668313] mmc0: host does not support reading read-only switch, assuming write-enable [ 3.670908] sunxi-mmc 1c11000.mmc: base:0xf08de000 irq:27 [ 3.671324] mmc0: new high speed SDHC card at address 0007 [ 3.672302] mmcblk0: mmc0:0007 SD04G 3.71 GiB [ 3.674067] mmcblk0: p1 [ 3.681882] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 8, RTO !! [ 3.686129] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.686996] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.687843] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.688672] sunxi-mmc 1c11000.mmc: smc 1 err, cmd 55, RTO !! [ 3.724762] mmc1: MAN_BKOPS_EN bit is not set [ 3.731196] mmc1: new high speed MMC card at address 0001 [ 3.732141] mmcblk1: mmc1:0001 P1XXXX 3.60 GiB [ 3.732553] mmcblk1boot0: mmc1:0001 P1XXXX partition 1 16.0 MiB [ 3.732960] mmcblk1boot1: mmc1:0001 P1XXXX partition 2 16.0 MiB [ 3.734186] mmcblk1: p1 root@egpr:~# cat /sys/kernel/debug/mmc0/ios clock: 50000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 2 (sd high-speed) signal voltage: 0 (3.30 V) driver type: 0 (driver type B) root@egpr:~# cat /sys/kernel/debug/mmc1/ios clock: 50000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 1 (mmc high-speed) signal voltage: 0 (3.30 V) driver type: 0 (driver type B) The brief performance test using dd shows the similar results to both 4- and 8-bit patches eMMC 8-bit patch R/W test with dd root@egpr:/mnt# dd if=/dev/zero of=1GBfile bs=1M count=1K 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 79.9305 s, 13.4 MB/s root@egpr:/mnt# dd of=/dev/null if=1GBfile 2097152+0 records in 2097152+0 records out 1073741824 bytes (1.1 GB) copied, 49.5899 s, 21.7 MB/s eMMC 4-bit patch R/W test with dd root@egpr:/mnt# dd if=/dev/zero of=1GBfile bs=1M count=1K 1024+0 records in 1024+0 records out 1073741824 bytes (1.1 GB) copied, 78.7925 s, 13.6 MB/s root@egpr:/mnt# dd of=/dev/null if=1GBfile 2097152+0 records in 2097152+0 records out 1073741824 bytes (1.1 GB) copied, 53.8002 s, 20.0 MB/s In my opinion 8-bit access to eMMC is broken in Allwinned A20 or in the mmc driver. Best regards Chris -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
