Hi all, I was looking at the internal working of a benchmark and the way it disables cache for direct IO operations, needed to benchmark storage device drivers. I have a small query regarding how cache is organized in RTEMS:
Usually data transfer model is something like: Application address space --> Page cache --> Write-back cache --> storage device is this model valid for RTEMS too? Moreover, in FreeBSD/Linux, O_DIRECT flag is used with the file descriptor to bypass write-back cache. do we have something like that in RTEMS? AFAIK, In RTEMS, libblock is used to transfer data to the storage device. So, configuring it like: > #define CONFIGURE_BDBUF_MAX_READ_AHEAD_BLOCKS 0 > should disable the cache? or is there any other setting that should be tweaked? Regards, Udit
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