[tor-relays] Upgrade your relay to 0.2.4.17-rc?

[Andy Isaacson]

On Thu, Sep 05, 2013 at 06:54:57AM -0400, Roger Dingledine wrote:
> So the more relays that upgrade to 0.2.4.17-rc, the more stable and fast
> Tor will be for 0.2.4 users, despite the huge circuit overload that the
> network is seeing.
> 
> Please consider upgrading. If you do, though, please also keep an eye
> on it -- it's possible we introduced some new bugs and the network will
> start dissolving once more relays move to the new version.

I've upgraded noisetor to 17-rc.  We were seeing memory consumption
exceeding 2GB/daemon (leading to swap storms on our 4-daemon 8GB box),
I'll keep an eye on it to see if we do better with 0.2.4.

After 20 minutes of uptime with 17-rc I'm not seeing the CPU pegged like
it was within minutes of restart with 0.2.3.25, even though we are
pushing 220 Mbps already.

According to "perf top" we're still spending a lot of time in circuit
creation/teardown though:

cycle%   image              symbol
------   -----              ------
 19.37%  tor                circuit_unlink_all_from_channel
 11.56%  libcrypto.so.1.0.0 bn_sqr4x_mont
  5.74%  tor                circuit_get_by_rend_token_and_purpose.constprop.11
  4.95%  libcrypto.so.1.0.0 sha1_block_data_order_ssse3
  3.56%  libcrypto.so.1.0.0 bn_mul4x_mont_gather5
  3.20%  libcrypto.so.1.0.0 _vpaes_encrypt_core
  2.03%  libcrypto.so.1.0.0 _bsaes_encrypt8_bitslice
  1.32%  libssl.so.1.0.0    ssl3_cbc_digest_record

-andy