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AlexGo's avatar
AlexGo
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6 years ago

Alternate driver for Avalon-MM DMA for PCIe

Hi All, If anyone is interested in a Linux device driver for Avalon-MM DMA for PCIe? The existing reference design code is quite difficult to maintain, while the alternate solution basically boils d...
MehmetFide's avatar
MehmetFide
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3 years ago

Well, I jumped to the branch avalon-dmaengine-v5.7-rc1, and after couple of adjustment I measured the speed as 60MB/sec with IOCTL_AVALON_DMA_READ cmd.

total: 10737418240 bytes, duration: 169 secs, speed = 60.59 MB/sec

Our target is to reach 100MB/sec in the user-space domain. Therefore I will continue digging.

MehmetFide's avatar
MehmetFide
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3 years ago

With the above branch it seems that IOCTL_AVALON_DMA_READ_SG command is also stable. This command and mmap() approach yielded 66.07MB/sec.

Could you explain what are *_SG_SMP commands and how they differ comparing to IOCTL_AVALON_DMA_*_SG?

Thank you.