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c0b7dac66e
Partial fix for #17064. Avoid excessive writes to the cache line containing the refcount for an EVP_MD object to avoid extreme cache contention when using a single EVP_MD at high frequency on multiple threads. This changes performance in 3.0 from being double that of 1.1 to only slightly higher than that of 1.1. Reviewed-by: Tim Hudson <tjh@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17857) |
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