Reduce TLS handshake contention on SSLCertContext#13098
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c-taylor wants to merge 1 commit intoapache:masterfrom
Open
Reduce TLS handshake contention on SSLCertContext#13098c-taylor wants to merge 1 commit intoapache:masterfrom
c-taylor wants to merge 1 commit intoapache:masterfrom
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Replace std::mutex with ts::bravo::shared_mutex on SSLCertContext to allow true reader concurrency for getCtx() on the TLS handshake hot path. setCtx() (config reload only) takes an exclusive lock. Memory trade-off: BRAVO uses 256 cache-line-aligned reader slots (~16 KB per mutex) vs ~40 bytes for std::mutex or ~56 bytes for std::shared_mutex on Linux. For 256 certificates this is ~4 MB (vs 10 KB / 14 KB), a modest cost relative to the SSL_CTX objects themselves but worth noting for deployments with many certs.
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Replace std::mutex with ts::bravo::shared_mutex on SSLCertContext to allow true reader concurrency for getCtx() on the TLS handshake hot path. setCtx() (config reload only) takes an exclusive lock.
Memory trade-off: BRAVO uses 256 cache-line-aligned reader slots (~16 KB per mutex) vs ~40 bytes for std::mutex or ~56 bytes for std::shared_mutex on Linux. For 256 certificates this is ~4 MB (vs 10 KB / 14 KB), a modest cost relative to the SSL_CTX objects themselves but worth noting for deployments with many certs.