I've often found my servers accidentally bottlenecked by the default open file limit on some Linuxes. For example, on CentOS 6 this is 4096, which for an exit node tends to mean ~50Mbit/s per process. A single process will not saturate 1Gbit/s. Judging by the hardware (AES-NI support) you will need 3 or 4 instances running simultaneously to max the link. Tom s7r schreef op 30/09/14 20:31:

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It has nothing to do with the location (US). There are fewer US exit relays than other countries in Europe.

Check the CPU usage too, usually CPU is the bottleneck on high port speed servers. Tor does not know yet how to do multithreading.

Do you have AES-NI hardware acceleration at your CPU? This is very helpful too.

Install htop (yum -y install htop) and it will tell you exactly how much each core is used. Let us know. I see that you confirm CPU load is not the fault, but probably you are checking it via a tool which is reporting the usage for ALL CPU (all cores) - try with htop and see if there is just one core @ 98% usage and others at less than 10%.

If the CPU is not the bottleneck, there is something at your provider (probably throttling Tor traffic to balance the other non-tor users in the same datacenter). If you built the network infrastructure there and know for sure such thing is not implemented there, don't really know what to say. CPU / RAM and Network interface is all you can test to see if it is the bottleneck for Tor. If all these are off the list, there is something upstream you.

I repeat, the location is not the fault here, and I encourage adding more exits in the US.

On 9/30/2014 8:52 PM, Jon Daniels wrote:

...

Hi,

My Tor node is not utilizing the bandwidth available to it. I have tried setting RelayBandwidthRate to various values with no change whatsoever in bandwidth usage.

Running for 5 months with 99.77% uptime: https://globe.torproject.org/#/relay/1F6598EA09A82E7A5D3131E71A97C806E6FDA4A...

My node has used a maximum of about 4MB/s or about 40Mbps. I've been expecting it to use 10MB/sec to 30 MB/sec. It dropped from 4MB/sec to around 1MB/sec now.

OS: CentOS 6.x 64bit latest CPU: Xeon E3 1230 MB: Supermicro X9SCL RAM: 8GB Network connection: 1000Mbps

Bandwidth tests show the server can easily send or receive hundreds of Mbps. I have tweaked server settings trying to get the speed up to no avail.

Tor v0.2.4.24 (git-549ec02c188842f6) running on Linux with Libevent 1.4.13-stable and OpenSSL 1.0.1e-fips.

Relevant config:

DirPort 9030 # what port to advertise for directory connections

RelayBandwidthRate 30 MB # Throttle traffic to 100KB/s (800Kbps) RelayBandwidthBurst 30 MB # But allow bursts up to 200KB/s (1600Kbps)

DisableDebuggerAttachment 0

ORPort 443

ExitPolicy accept *:20-23 # FTP, SSH, telnet ExitPolicy accept *:43 # WHOIS ExitPolicy accept *:53 # DNS ExitPolicy accept *:79-81 # finger, HTTP ExitPolicy accept *:88 # kerberos ExitPolicy accept *:110 # POP3 ExitPolicy accept *:143 # IMAP ExitPolicy accept *:194 # IRC ExitPolicy accept *:220 # IMAP3 ExitPolicy accept *:389 # LDAP ExitPolicy accept *:443 # HTTPS ExitPolicy accept *:464 # kpasswd ExitPolicy accept *:531 # IRC/AIM ExitPolicy accept *:543-544 # Kerberos ExitPolicy accept *:554 # RTSP ExitPolicy accept *:563 # NNTP over SSL ExitPolicy accept *:636 # LDAP over SSL ExitPolicy accept *:706 # SILC ExitPolicy accept *:749 # kerberos ExitPolicy accept *:873 # rsync ExitPolicy accept *:902-904 # VMware ExitPolicy accept *:981 # Remote HTTPS management for firewall ExitPolicy accept *:989-995 # FTP over SSL, Netnews Administration System, telnets, IMAP over SSL, ircs, POP3 over SSL ExitPolicy accept *:1194 # OpenVPN ExitPolicy accept *:1220 # QT Server Admin ExitPolicy accept *:1293 # PKT-KRB-IPSec ExitPolicy accept *:1500 # VLSI License Manager ExitPolicy accept *:1533 # Sametime ExitPolicy accept *:1677 # GroupWise ExitPolicy accept *:1723 # PPTP ExitPolicy accept *:1755 # RTSP ExitPolicy accept *:1863 # MSNP ExitPolicy accept *:2082 # Infowave Mobility Server ExitPolicy accept *:2083 # Secure Radius Service (radsec) ExitPolicy accept *:2086-2087 # GNUnet, ELI ExitPolicy accept *:2095-2096 # NBX ExitPolicy accept *:2102-2104 # Zephyr ExitPolicy accept *:3128 # SQUID ExitPolicy accept *:3389 # MS WBT ExitPolicy accept *:3690 # SVN ExitPolicy accept *:4321 # RWHOIS ExitPolicy accept *:4643 # Virtuozzo ExitPolicy accept *:5050 # MMCC ExitPolicy accept *:5190 # ICQ ExitPolicy accept *:5222-5223 # XMPP, XMPP over SSL ExitPolicy accept *:5228 # Android Market ExitPolicy accept *:5900 # VNC ExitPolicy accept *:6660-6669 # IRC ExitPolicy accept *:6679 # IRC SSL ExitPolicy accept *:6697 # IRC SSL ExitPolicy accept *:8000 # iRDMI ExitPolicy accept *:8008 # HTTP alternate ExitPolicy accept *:8074 # Gadu-Gadu ExitPolicy accept *:8080 # HTTP Proxies ExitPolicy accept *:8087-8088 # Simplify Media SPP Protocol, Radan HTTP ExitPolicy accept *:8332-8333 # BitCoin ExitPolicy accept *:8443 # PCsync HTTPS ExitPolicy accept *:8888 # HTTP Proxies, NewsEDGE ExitPolicy accept *:9418 # git ExitPolicy accept *:9999 # distinct ExitPolicy accept *:10000 # Network Data Management Protocol ExitPolicy accept *:11371 # OpenPGP hkp (http keyserver protocol) ExitPolicy accept *:12350 # Skype ExitPolicy accept *:19294 # Google Voice TCP ExitPolicy accept *:19638 # Ensim control panel ExitPolicy accept *:23456 # Skype ExitPolicy accept *:33033 # Skype ExitPolicy accept *:64738 # Mumble ExitPolicy reject *:*

In addition, there's another Tor node running at the same ISP (but by a different person), on completely different hardware and a different router, that exhibits the same issue:

https://globe.torproject.org/#/relay/50F37822AFA257B24B3343D9BBFB0442E900FB4...

For background, I built and manage the network both servers are hosted on and have been doing so for 20 years. I also built both servers. The network is at less than 15% capacity, 99% of the time.

CPU load is always at 0.00. Based in the USA, west coast.

Ideas? Is there simply less demand for tor traffic in the US?

Cheers, Jon

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If the CPU is not the bottleneck, there is something at your provider (probably throttling Tor traffic to balance the other non-tor users in the same datacenter). If you built the network infrastructure there and know for sure such thing is not implemented there, don't really know what to say. CPU / RAM and Network interface is all you can test to see if it is the bottleneck for Tor. If all these are off the list, there is something upstream you.

I recall reading on the Tor blog that there is a bit of a lull after you get the Guard flag for your relay. Given that these days Tor clients only choose one guard, is it possible that his relay just hasn't built up a list of Tor clients using it as a guard yet? Thank you, Derric Atzrott -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (MingW32) iD8DBQFUKvs9hiwmHXffHDoRAkDYAKDSbBKYhzmzlMT3cobveMtkQKOQvQCgxt01 0gYSB0GikeUx92CaN3jJdSA= =E4B2 -----END PGP SIGNATURE-----