Hi, Just tested on my BeagleBone Black A5C with 2GB micron eMMC. Tested with latest Debian Beta booting from SD card (Samsung EVO 32GB Class 10). Here's my numbers:
SD Read: root@beaglebone:~# dd if=zero of=/dev/null bs=200M count=1 1+0 records in 1+0 records out 209715200 bytes (210 MB) copied, 10.9215 s, 19.2 MB/s SD Write: root@beaglebone:~# dd if=/dev/zero of=zero bs=200M count=1 1+0 records in 1+0 records out 209715200 bytes (210 MB) copied, 15.297 s, 13.7 MB/s 2GB eMMC Read: root@beaglebone:~# dd if=emmc/zero of=/dev/null bs=200M count=1 1+0 records in 1+0 records out 209715200 bytes (210 MB) copied, 10.4306 s, 20.1 MB/s 2GB eMMC Write: dd if=/dev/zero of=emmc/zero bs=200M count=1 1+0 records in 1+0 records out 209715200 bytes (210 MB) copied, 39.1959 s, 5.4 MB/s I have 4GB Micron part (MTFC4GMDEA-4M) on my custom AM335x board (similar to BeagleBone Black design) and get this on it's eMMC (booted to eMMC): 4GB eMMC Read: 1+0 records in 1+0 records out 209715200 bytes (210 MB) copied, 7.65176 s, 27.4 MB/s 4GB eMMC Write: ./dd if=/dev/zero of=zero bs=200M count=1 1+0 records in 1+0 records out 209715200 bytes (210 MB) copied, 20.3072 s, 10.3 MB/s Thanks, Dave On Sunday, June 8, 2014 7:59:04 AM UTC-4, [email protected] wrote: > > I was wondering if anyone has any number comparing the 2GB eMMCs (original > BBB) and the 4GB (Rev C) eMMC speeds? > > They claim it is faster but would like to see proof. > > When I compared the Micron 2GB eMMC vs. the SanDisk iNAND parts of the > same size the SanDisk parts smoked the Micron. > > I found boot and R/W times on the Micron parts are awful. So much so even > some off brand off-the-shelf standalone uSD cards show much faster boot > times (just the reading phase). > > > > Both the SanDisk and the Micron parts have the Double Data Rate (DDR) > feature which would speed thing up greatly but this ability on the AM335x > seems to be broken. > > TI claims DDR was not implemented and should never have been included in > the TRM ..which I see they now have amended. > > > > Any numbers? > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" 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.
