Am 27.04.2015, 04:07 Uhr, schrieb Stefan Monnier
<[email protected]>:
I'm building kernel 3.19+ since it's reported to work fine with BananaPi
I've read on the sunxi mainline kernel status that the DMA engine for
A10/A20 is still in progress and a patch, so far at V4, exist.
Has anyone tried to use this patch together with GMAC?
I'm not sure if in the sunxi 3.4.x kernel the GMAC run with DMA, but it
would give an important boost to the netwok performances
AFAIK, the GMAC, USB, and SATA subsystems use their own DMA system, so
they already use DMA and aren't affected by the dmaengine patches.
The dmaengine patches are useful for the audio support, and could be
useful for the security (encrypt/decrypt) chip support, and a few other
such things.
Stefan
When SATA uses it's own DMA code this could explain why writing to SATA
disk is up to 5 times slower than reading.
Can anybody tell me if this is a speciality of kernels for Allwinner or if
it is the same for X86 architectures?
Thx!
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