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Altera_Forum
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13 years ago

PCIE throughput test

Hi All, I am doing a PCIE throughput test, the test result numbers are quite strange (write is 210MB/s but read is just 60MB/s for PCIE gen1 x1). I would like to ask for your suggestions a...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

Someone just added a post to an old thread where an earlier comment had implied that the SGMA was likely to only generate 64bit TLP for write.

Generating long TLP requires some direct links between the DMA and PCIe blocks (think about how long read TLP will be requested). This is easiest if the DMA is part of the PCIe block (which is what I had to use on the ppc), if it is external (like SGMA) I'm not sure how long read TLP get generated.