UNCLASSIFIED
We've been trying to increase the size of our buffer from RCC to HDL space, due
to the current speeds across PCI being fairly slow (they roughly follow the
small transfer speeds in Shep's email).
When we increased the sequenceLength in our protocol xml from "4k" to "4m"
(type=short thus 8192000 bytes) and run we get the message:
"Requested buffer count and size won't fit in the OCDP's memory"
Having tried various sizes, we clearly need some guidance on how to create high
BW transfers.
1. In Shep's email (a line from it is below), what is the relationship between
bytes and framesize to Type and SequenceLength from protocol XML.
"Bytes 16000, Time delta = 1947, 8.217771 MBytes/seconds, Framesize 16"
2. When a protocol contains several operations, does OpenCPI allocate just
enough space for the largest one or does it add them together. I ask because
the line in HdlContainer.cxx that checks for an error and throws the OCDP error
mentioned above has "myDesc.nBuffers * (...)" which implies that the number of
buffers is multiplied by the largest buffer size. We have several operations
in one protocol and this may be causing issues.
3. If this isn't already answered by 1), what needs to be set in order to have
large buffer sizes (e.g. 8Mb), including OpenCPI memory settings (e.g.
allocation of memory for the OCDP).
Cheers,
Nigel
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