> I'm confused about what buffers-per-numa and buffer data-size are > referring to? If I'm trying to determine overall packet buffer > occupancy levels, should I use buffers-per-numa or data-size?
A buffer in VPP is composed of a 128-bytes header, a 128-bytes scratchpad (to allow eg. tunneling w/o moving data) and the data buffer. 'data-size' specify the size of the data buffer, ie the total size of the buffer will be 256-bytes + data-size. 'buffers-per-numa' is the number of buffers to allocate per NUMA node. On a standard 2-socket server with 2 NUMA nodes, you'll allocate a total of 2 * buffers-per-numa buffers. So the memory consumption for buffers should be something like 2 * buffers-per-numa * (256 + data-size). Now, this is not exactly true, because the buffers are aligned on cachelines, are not split accross pages and the total will rounded up to the pagesize, so there will be some additional overhead, but it should gives you the right order of magnitude. > Would this change if I use DPDK? Meaning, is the buffer allocated by DPDK > queue memory or VPP? No, even with DPDK the buffer pool is managed by VPP. There is some overhead in that case because each buffer must accommodate an additional dpdk header. Best ben
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