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Re: [tor-bugs] #12464 [Tor]: When Tor 0.2.6.x is closer to done, profile relays running Tor 0.2.6.x and optimize accordingly
#12464: When Tor 0.2.6.x is closer to done, profile relays running Tor 0.2.6.x and
optimize accordingly
------------------------+-------------------------------------------------
Reporter: nickm | Owner: dgoulet
Type: defect | Status: assigned
Priority: normal | Milestone: Tor: 0.2.6.x-final
Component: Tor | Version:
Resolution: | Keywords: tor-relay performance 026-triaged-1
Actual Points: | Parent ID:
Points: |
------------------------+-------------------------------------------------
Comment (by dgoulet):
Latest profiling at commit 99e915dbfea9b2b985a10368721d9c79b358abbe
{{{
+ 15.86% tor [.] fmonty
+ 3.79% tor [.] circuitmux_find_map_entry
+ 2.81% tor [.] connection_bucket_refill
+ 2.57% tor [.] connection_handle_read_impl
+ 1.99% tor [.] buf_datalen
+ 1.79% tor [.] assert_connection_ok
+ 1.52% tor [.] connection_or_process_cells_from_inbuf
}}}
I can see a couple of way of reducing {{{circuitmux_find_map_entry()}}}
cpu time by calling it less. For instance, {{{update_circuit_on_cmux_}}}
calls it 3 times in the same function querying the same cmux,circ pair.
Clearly biggest part of the CPU is crypto. Here is an other view without a
procname "tor" filter. First value of 37.04% is kernel work.
{{{
+ 37.04% tor [ctr] [k] 0xffffffff8104f45a
+ 3.85% tor tor [.] fmonty
+ 2.85% tor libcrypto.so.1.0.0 [.] gcm_ghash_clmul
+ 2.82% tor libcrypto.so.1.0.0 [.] aesni_ctr32_encrypt_blocks
+ 2.14% tor libcrypto.so.1.0.0 [.] aesni_cbc_sha1_enc_avx
+ 2.01% tor libcrypto.so.1.0.0 [.] bn_sqr4x_mont
+ 1.62% tor libc-2.19.so [.] _int_malloc
+ 1.60% tor libcrypto.so.1.0.0 [.] sha1_block_data_order_avx
+ 1.04% tor libc-2.19.so [.] __memcpy_sse2_unaligned
+ 0.95% tor libevent-2.0.so.5.1.9 [.] event_base_loop
+ 0.95% tor libz.so.1.2.8 [.] 0x0000000000002a87
+ 0.92% tor tor [.] circuitmux_find_map_entry
}}}
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12464#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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