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MBEDTLS_ECP_WINDOW_SIZE is a compromise between memory usage (growing based on the value) and performance (faster with larger values). There are disminishing returns as the value grows larger. Based on Manuel's benchmarks recorded in https://github.com/ARMmbed/mbedtls/issues/4127, 4 is a good compromise point, with larger values bringing little advantage. So reduce the default from 6 to 4. Document the default value as in optimized for performance mostly, but don't document the specific value, so we may change it later or make it platform-dependent. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
4 lines
150 B
Plaintext
4 lines
150 B
Plaintext
Changes
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* Reduce the default value of MBEDTLS_ECP_WINDOW_SIZE. This reduces RAM usage
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during ECC operations at a negligible performance cost.
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