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The UDMA and BCDMA can provide higher throughput if the burst_size of the channel is changed from it's default (which is 64 bytes) for Ultra-high and high capacity channels. This performance benefit is even more visible when the buffers are aligned with the burst_size configuration. The am654 does not have a way to change the burst size, but it is using 64 bytes burst, so increasing the copy_align from 8 bytes to 64 (and clients taking that into account) can increase the throughput as well. Numbers gathered on j721e: echo 8000000 > /sys/module/dmatest/parameters/test_buf_size echo 2000 > /sys/module/dmatest/parameters/timeout echo 50 > /sys/module/dmatest/parameters/iterations echo 1 > /sys/module/dmatest/parameters/max_channels Prior this patch: ~1.3 GB/s After this patch: ~1.8 GB/s with 1 byte alignment: ~1.7 GB/s Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@gmail.com> Tested-by: Kishon Vijay Abraham I <kishon@ti.com> Link: https://lore.kernel.org/r/20210113114923.9231-3-peter.ujfalusi@gmail.com Signed-off-by: Vinod Koul <vkoul@kernel.org> |
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| .. | ||
| cppi41.c | ||
| dma-crossbar.c | ||
| edma.c | ||
| k3-psil-am64.c | ||
| k3-psil-am654.c | ||
| k3-psil-j721e.c | ||
| k3-psil-j7200.c | ||
| k3-psil-priv.h | ||
| k3-psil.c | ||
| k3-udma-glue.c | ||
| k3-udma-private.c | ||
| k3-udma.c | ||
| k3-udma.h | ||
| Kconfig | ||
| Makefile | ||
| omap-dma.c | ||