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Hi everyone, I have a small form-factor Dell Optiplex 7010 (Core i7 3700, 8GB DDR3, 128GB SSD) with a quad port Intel Pro 1000PT NIC, running Arch Linux, as my edge router. It covers two local subnets (trusted LAN, and DMZ/servers/IoT), with the trusted LAN clients all being routed out via an AzireVPN WireGuard tunnel on WAN. It works great for this and 15 minute load averages are in the order of 0.1! My question is about multithreading/SMT on that Core i7. At the moment I have it enabled, and WireGuard seems to simmer nicely across all 8 threads. However, with the known Intel security issues and recommendations to disable HT, I got to wondering how much - if at all - disabling HT would impact on WireGuard's real world performance. I mean, it obviously can utilise logical cores/threads, but is there a real world throughput benefit vs just using the real cores? While my router is overkill anyway (about 18% to 20% usage under full network load with 4c8t), I obviously still want to run it in the most efficient way possible. Is WireGuard making real use of those logical cores/threads? Or will it run just as well on 4 'real' cores as on 4 cores and 4 HT threads? I know the obvious answer is to test it out, but the router runs headless and is awkward to get a monitor to so I can access the BIOS. I did try for a short time when I first set it up, and aside from CPU usage going up (because of having half the available 'resources' with HT disabled) nothing seemed to change. My WAN is 'only' 400Mbps anyway so hardly a taxing test. Because of this, I can't really learn about how much WireGuard benefits from the extra threads, if it does at all, as either way I have headroom to spare for my current WAN provision. So, technically speaking, is WireGuard able/programmed to take demonstrable real world advantage of logical SMT/HT threads; or is more real cores the only proper way to scale performance with it? Cheers, Lee Yates -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEExF+G9PyiAB1cKHnz7yXLzDsoqZIFAlxlrS0ACgkQ7yXLzDso qZJROwf/b76RT+dFoo88KU36UJYRifluCBQ8TMfmj0DbWSQuyvQouJFqovYtt18/ UHSL/6KTgcHEkGFSaIQqAyP3xT7VjWjFhqyaOmBM1oAQ3HuVzmxnwkE4vumnhmHF CrkIHcLNG/8jT1Xddd5q9rVcABqgGqOjT8lyF83id3MCPWj2njxBczQvILXq7i21 jvkzfnpEA94qG5IdV2xtGBQbtLwbHIu+ek7ayVj+NbyjLfv708wvMhUAf/1pQHew WKBqv4tENMbKgrARhhS4YYHOo4nl14iRHQTDSm7a27xMdaDUW+M6+EtY+/citllx OH0s5SYkkUClWRLCsooXJipfVWkw1A== =Is7v -----END PGP SIGNATURE----- _______________________________________________ WireGuard mailing list [email protected] https://lists.zx2c4.com/mailman/listinfo/wireguard
