On Mon, Mar 10, 2014 at 10:52 AM, Andrew Bradford andrew@bradfordembedded.com wrote:
Doing open-au tests nets no useful data, it's always fast, so just a few examples at the bottom.
Any chance this test was bottleneck on the SDIO interface link speed?
# Exynos5 ARM system fgrep mmc_host /var/log/messages ... 2014-03-10T10:38:59.069638-07:00 localhost kernel: [ 0.927858] mmc_host mmc0: Bus speed (slot 0) = 100000000Hz (slot req 52000000Hz, actual 50000000HZ div = 1) 2014-03-10T10:38:59.069901-07:00 localhost kernel: [ 0.970145] mmc_host mmc1: Bus speed (slot 0) = 200000000Hz (slot req 200000000Hz, actual 200000000HZ div = 0)
means 50Mhz 4 bits * (80% efficiency) == ~20 MB/s ... this is really a rough estimate.
(Offhand, I don't know where "width" of the SDIO link is advertised ... just happen to know what it is for this platform).
cheers, grant