From: lng-odp-boun...@lists.linaro.org [mailto:lng-odp-boun...@lists.linaro.org] On Behalf Of ext Bill Fischofer Sent: Tuesday, December 09, 2014 1:08 PM To: lng-odp-forward Subject: [lng-odp] Alignment question
A number of APIs support a buf_align parameter but we haven't been terribly precise about limits on this, so some questions for Petri. I think only buffer_pool_create has alignment parameter. With buf_align being defined as uint32_t in theory we can specify alignments up to 2GB. 1. MAY implementations impose a lower upper limit on the alignments they support? ODP_CONFIG_BUFFER_ALIGN_MAX (4*1024) ? 2. If so, what is the minimum acceptable upper alignment limit? We've specified that buffers MUST be at minimum 8 byte aligned but is that sufficient? ODP_CONFIG_BUFFER_ALIGN_MIN 8 ? 3. If implementations MAY impose an upper alignment limit below 2GB, what SHOULD happen if an application requests an alignment above this limit? Fail the request? Saturate at the implementation-defined max alignment? It should fail. User requests minimum alignment, implementation can round up. -Petri
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