I was running a benchmark on a 28 core (56 hyper-threaded) server that is running 84 threads in the process and I am seeing a lot of lock contention. I saw a lot of lock contention in the calls to SSL_get_error() ssl3_accept(). I am running RHEL 6.5 and openssl-1.0.1e-30.el6_6.7.x86_64. We have used SSL_locking_callback() to setup pthread mutex locks, but haven?t setup dynlocks yet. Would dynlocks help in this scenario? Output from perf: Samples: 1M of event 'cycles', Event count (approx.): 602783506611 - 48.04% [ET_NET 0] [kernel.kallsyms] [k] _spin_lock ? - _spin_lock ? + 48.05% futex_wait_setup ? + 47.79% futex_wake ? + 1.20% tcp_v4_rcv ? + 0.98% task_rq_lock ? + 0.64% double_lock_balance ? + 3.94% [ET_NET 0] libcrypto.so.1.0.1e [.] bn_mul_mont ? + 1.93% [ET_NET 0] libcrypto.so.1.0.1e [.] BN_usub ? + 1.80% [ET_NET 0] libcrypto.so.1.0.1e [.] 0x00000000000e5200 ? + 1.49% [ET_NET 0] libcrypto.so.1.0.1e [.] sha256_block_data_order ? + 0.97% [ET_NET 0] libcrypto.so.1.0.1e [.] gcm_ghash_clmul ? + 0.85% [ET_NET 0] libpthread-2.12.so [.] pthread_mutex_lock ? + 0.84% [ET_NET 0] libcrypto.so.1.0.1e [.] aesni_ctr32_encrypt_blocks ? + 0.74% [ET_NET 0] libc-2.12.so [.] malloc ? + 0.72% [ET_NET 0] libc-2.12.so [.] memcpy ? + 0.57% [ET_NET 0] libcrypto.so.1.0.1e [.] BN_mod_mul_montgomery ? + 0.51% [ET_NET 0] libpthread-2.12.so [.] pthread_mutex_unlock pstack of the process (only a couple of the interesting threads): Thread 1 (Thread 0x7f1fba151800 (LWP 1106)): #0 0x00007f1fbaaeb264 in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f1fbaae6508 in _L_lock_854 () from /lib64/libpthread.so.0 #2 0x00007f1fbaae63d7 in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x000000000072822f in SSL_locking_callback(int, int, char const*, int) () #4 0x00000031d2ae7f03 in ?? () from /usr/lib64/libcrypto.so.10 #5 0x00000031d2ae7d8c in ?? () from /usr/lib64/libcrypto.so.10 #6 0x00000031d2ae80ab in ERR_get_state () from /usr/lib64/libcrypto.so.10 #7 0x00000031d2ae8557 in ?? () from /usr/lib64/libcrypto.so.10 #8 0x00000031d2e424a9 in SSL_get_error () from /usr/lib64/libssl.so.10 #9 0x00000000007249ef in SSLNetVConnection::load_buffer_and_write(long, long&, long&, MIOBufferAccessor&, int&) () #10 0x00000000007389df in write_to_net_io(NetHandler*, UnixNetVConnection*, EThread*) () #11 0x0000000000738523 in write_to_net(NetHandler*, UnixNetVConnection*, EThread*) () #12 0x0000000000731922 in NetHandler::mainNetEvent(int, Event*) () #13 0x00000000004f6d48 in Continuation::handleEvent(int, void*) () #14 0x000000000075877a in EThread::process_event(Event*, int) () #15 0x0000000000758c84 in EThread::ex Thread 56 (Thread 0x7f1fb0ecd700 (LWP 1172)): #0 0x00007f1fbaae77d9 in pthread_mutex_unlock () from /lib64/libpthread.so.0 #1 0x0000000000728265 in SSL_locking_callback(int, int, char const*, int) () #2 0x00000031d2b57402 in ?? () from /usr/lib64/libcrypto.so.10 #3 0x00000031d2b574bd in FIPS_selftest_failed () from /usr/lib64/libcrypto.so.10 #4 0x00000031d2ae9f1c in EVP_DigestInit_ex () from /usr/lib64/libcrypto.so.10 #5 0x00000031d2a7977e in HMAC_Init_ex () from /usr/lib64/libcrypto.so.10 #6 0x00000031d2a79c29 in ?? () from /usr/lib64/libcrypto.so.10 #7 0x00000031d2af7a42 in EVP_PKEY_CTX_ctrl () from /usr/lib64/libcrypto.so.10 #8 0x00000031d2ae9ffb in EVP_DigestInit_ex () from /usr/lib64/libcrypto.so.10 #9 0x00000031d2af952a in ?? () from /usr/lib64/libcrypto.so.10 #10 0x00000031d2e34cf2 in tls1_PRF () from /usr/lib64/libssl.so.10 #11 0x00000031d2e35796 in tls1_final_finish_mac () from /usr/lib64/libssl.so.10 #12 0x00000031d2e2db2e in ssl3_get_message () from /usr/lib64/libssl.so.10 #13 0x00000031d2e1dc3c in ssl3_get_cert_verify () from /usr/lib64/libssl.so.10 #14 0x00000031d2e220d6 in ssl3_accept () from /usr/lib64/libssl.so.10 #15 0x0000000000725287 in SSLNetVConnection::sslServerHandShakeEvent(int&) () #16 0x00000000007251b3 in SSLNetVConnection::sslStartHandShake(int, int&) () #17 0x0000000000723df3 in SSLNetVConnection::net_read_io(NetHandler*, EThread*) () #18 0x0000000000731852 in NetHandler::mainNetEvent(int, Event*) () #19 0x00000000004f6d48 in Continuation::handleEvent(int, void*) () #20 0x000000000075877a in EThread::process_event(Event*, int) () #21 0x0000000000758c84 in EThread::execute() () #22 0x0000000000757cf8 in spawn_thread_internal(void*) () #23 0x00007f1fbaae49d1 in start_thread () from /lib64/libpthread.so.0 #24 0x00000030ff0e88fd in clone () from /lib64/libc.so.6 -Bryan -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mta.openssl.org/pipermail/openssl-users/attachments/20150423/b543628c/attachment.html>
