Re: [tor-relays] 0.2.5.10 / 0.2.6.x and ticket 9682

[Sebastian Urbach <sebastian@xxxxxxxxxx>]

On March 6, 2015 11:32:01 PM Tom van der Woerdt <info@xxxxxxx> wrote:

Hi Tom,

> Sebastian Urbach schreef op 06/03/15 om 21:52:
> > Dear list members,
> >
> > I hope that some of you compared 0.2.5.10 with 0.2.6.x regarding the
> > performance (ticket 9682). How big/small is the difference in the wild ?
> > I would appreciate it if someone with Linux / BSD could say a few words ;-)
> >
>
> Hi Sebastian,
>
> As far as I can tell the change happened between 0.2.6.2 and 0.2.6.3 so
> I'll describe the performance difference between those.

You're right, got 0.2.5.10 stuck in my head because it's the last stable 
release ;-) The patch came up with 0.2.6.3, indeed.

> Just had a look on a server of mine that is bottlenecked by the CPU. I
> noticed that there was indeed a big drop in CPU usage. However, there
> was also a similar drop in network usage, most likely caused by the
> restart. It took about a week to fully recover to normal levels.
>
> It is incredibly hard to tell from the data whether there was a big
> performance difference as a direct result of the 0.2.6.2->0.2.6.3
> upgrade. It's definitely not going to be a 10% improvement, as far as I
> can tell.

Hard to tell pretty much says it all :-( Not much of a change. Now the 
multithread feature becomes the last hope :-)

> Despite my nodes all running with 'NumCPUs 2', none of the worker queues
> seem to be doing much :
>
> $ ps H -o etime,time,args -u toranon | grep node2
>     3-01:46:17 1-20:35:33 /usr/bin/tor -f /etc/tor/torrc-node2
>     3-01:46:13   00:17:09 /usr/bin/tor -f /etc/tor/torrc-node2
>     3-01:46:13   00:17:09 /usr/bin/tor -f /etc/tor/torrc-node2
>
> If those threads are what the patch addressed, I'm afraid it's not going
> to have a massive impact.
>
> In case it's relevant: these measurements are taken from an exit relay
> with two processes each doing ~150Mbit/s (x2 if you count up+down).
>
> Upgrade was done at 2015-02-24 21:26, relevant graphs :
>    * cpu:
> http://www.imgdumper.nl/uploads8/54fa2a823bc62/54fa2a823434f-cpu.png
>    * network:
> http://www.imgdumper.nl/uploads8/54fa2a8ce3db5/54fa2a8cdd05c-if_eth1.png

Thanks gor your reply, domehow i expected it zo be more of a boost after 
reading Nick's text:

https://blog.torproject.org/blog/coming-tor-026

--
Sincerely yours / Sincères salutations / M.f.G.

Sebastian Urbach

-----------------------------------------
Religion is fundamentally opposed to
everything I hold in veneration - courage,
clear thinking, honesty, fairness, and,
above all, love of the truth.
-----------------------------------------
Henry Louis Mencken (1880 - 1956),
American journalist, essayist, magazine
editor, satirist and critic.


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