Hi there,
I am the operator of the following relay:
https://metrics.torproject.org/rs.html#details/47E1157F7DA6DF80EC00D745D73AC...
The relay is running on my Arch Linux server running kernel version 5.6.11.
This is my tor configuration file:
ORPort 37.157.195.83:38619 ORPort [2a02:2b88:2:1::3239:0]:38619 DirPort 37.157.195.83:44776 Nickname michaelscott ContactInfo ttallink@googlemail.com ControlPort 9051 SocksPort 0 CookieAuthentication 1 ExitPolicy reject *:* DataDirectory /var/lib/tor Sandbox 1
Linux kernel boot parameters from grub:
quiet mitigations=off
Kernel parameters from /etc/sysctl.d set on boot through systemd:
kernel.dmesg_restrict = 1 net.ipv6.ip_nonlocal_bind = 1 kernel.yama.ptrace_scope = 3 vm.swappiness = 60
Tor systemd unit (shipped by distribution):
[Unit] Description=Anonymizing Overlay Network After=network.target
[Service] User=tor Type=simple ExecStart=/usr/bin/tor -f /etc/tor/torrc ExecReload=/usr/bin/kill -HUP $MAINPID KillSignal=SIGINT LimitNOFILE=8192 PrivateDevices=yes
[Install] WantedBy=multi-user.target
Tor systemd unit overrides:
[Service] ProtectSystem=strict ProtectHome=true PrivateTmp=true ProtectKernelLogs=true ProtectKernelModules=true ProtectKernelTunables=true ProtectControlGroups=true NoNewPrivileges=true RestrictSUIDSGID=true RestrictAddressFamilies=AF_INET AF_INET6 ReadWritePaths=/var/lib/tor
Occasionally, the CPU usage hit's 100%, and the maximum throughput drops down to around 16 Mbps from it's usual 80 Mbps. This happens randomly and not a fixed intervals which makes it pretty hard to profile.
No abnormal entries in the log files.
I found ticket #24857 in which someone describes a similar behavior, but on _Windows_.
https://trac.torproject.org/projects/tor/ticket/24857
Is this also an issue on Linux?
In that case, setting DirCache to 0 should fix the issue, however that would mean that, according to the manual, I would no longer be able to mirror directory information.
If anyone else encountered the same problem and found a solution, please let me know.
Best Regards, William