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Some versions of the ENA hardware (observed on a c6i.large instance in eu-west-2) seem to require a receive ring containing at least 128 entries: any smaller ring will never see receive completions or will stall after the first few completions. Increase the receive ring size to 128 entries (determined empirically) for compatibility with these hardware versions. Limit the receive ring fill level to 16 (as at present) to avoid consuming more memory than will typically be available in the internal heap. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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