[tor-relays] Unused Tor exit nodes capacity

Sun Dec 13 22:41:24 UTC 2015

Hi,
are you useing cat7 cable?
Did you configure a DNS fall-back 8.8.8.8 to be on the safe side?

Ok, with (1000 mBit x2=) 2000mBit you are handling 114,3 MB/s

16,8
+2,7
+9,6
+19,7
+26,2
+7,0
+22,6
+9,7
= 114,3 MB/s

Thats already good. Did you declare a cut-off?
You can experimentally try my follwing advice:
For each Tor process set in torrc:
BandwidthRate 13000000 bytes
BandwidthBurst 13375000 bytes

So you end up with
Server1: 4x 13000000 bytes = 4x13MB/s
Server2: 4x 13000000 bytes = 4x13MB/s
(in each direction)
104+104=208 MB/s
You hopefully will end up with ~540TB per month.

(oh, don't miss your upgrade to 0.2.7.6)
(-:

Am Sonntag, 13. Dezember 2015 21:18 schrieb Dirk Eschbach 
<tor-relay.dirk at o.banes.ch>:

> Hello all,
> 
> we are administrating 2 Tor Exits for privacyfoundation.ch [1].
> 
> In the last month we realized that the traffic which is going through
> our servers / throughput is
> by far less than the machines and the providers network can handle.
> We were internally and recently with Moritz from torservers.net 
> looking
> at this problem but could
> not find a way to improve throughput.
> Even on the same machine the throughput between servers varies a lot
> with out any visible reason.
> 
> I hope you can help.
> 
> Our setup is two servers with a maximum of 4 tor processes (exit) 
> each.
> Looking at CPU, Disk, RAM and so on the machines are not busy at all.
> 
> Konsole output
> top - 09:57:49 up 16 days, 11:57,  1 user,  load average: 1.14, 0.91, 
> 0.81
> Tasks:244 total,  3 running,241 sleeping,  0 stopped,  0 zombie
> %Cpu0  :12.5 us, 3.4 sy, 0.0 ni,79.7 id, 0.0 wa, 0.0 hi, 4.4 si, 0.0 
> st
> %Cpu1  :15.9 us, 5.4 sy, 0.0 ni,74.3 id, 0.3 wa, 0.0 hi, 4.1 si, 0.0 
> st
> %Cpu2  :14.3 us, 2.7 sy, 0.0 ni,77.0 id, 0.0 wa, 0.0 hi, 6.0 si, 0.0 
> st
> %Cpu3  : 9.5 us, 3.4 sy, 0.0 ni,80.3 id, 0.0 wa, 0.0 hi, 6.8 si, 0.0 
> st
> KiB Mem:   3877624 total, 2739880 used, 1137744 free,    1288 buffers
> KiB Swap: 4026364 total,  364264 used, 3662100 free.   10752 cached 
> Mem
> 
> Looking at the network connection it is without any problem possible 
> to
> start big downloads without reducing TOR throughput.
> The servers are connected with 1 Gbit/s each.
> 
> The big question now is:
> Why do the machines do not have more throughput ?
> Is the reason for this the way the distribution through the Tor 
> network
> works.
> Moritz hinted it might have to do with the way the tor "bandwidth
> scanners" measure the ability of a server to handle traffic.
> 
> Can you explain me / point me to documentation where this process is
> described and how this can be optimized.
> What are the criteria for tor exit node server traffic distribution ?
> How do the clients choose the exit ?
> 
> I would be very happy if you could provide some answers / 
> documentation
> which will set me on the right track.
> 
> Thanks very much for you help.
> 
> Dirk
> 
> [1] https://globe.torproject.org/#/search/query=digiges
> 
> 
> _______________________________________________
> tor-relays mailing list
> tor-relays at lists.torproject.org
> https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays
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