I see the quite high TCP memory net.ipv4.tcp_mem setting of 100M max pages (assuming standard 4K pages that's 381GiB, even more than actual physical memory the

I see the quite high TCP memory net.ipv4.tcp_mem setting of 100M max pages (assuming standard 4K pages that's 381GiB, even more than actual physical memory the machine has, so it feels a bit unsafe, as I think sometimes kernels may lock up badly when they're overpressured - better start spewing errors reasonably early), but don't see any tweaks about how much each individual connection uses. I wonder if tcp_rmem/wmem tweaks can improve performance (well, I'm not sure, but I think it's not completely unreasonable to assume that if connections are idle they don't need the default - IIRC - 85KiB read and 16KiB write buffers)