On Wed, Sep 10, 2025 at 8:20 AM nanog--- via NANOG <[email protected]> wrote: > A hash is also way faster than 5ms to compute. I suggest doing your own > benchmark. Run it on an old raspberry pi or one of Amazon's cheapest ARM > servers to be sure it's comparable to typical router CPU hardware.
Perfect. The CPU of a Pi as in an ARMv7 is far too low to efficiently bear the load involved in IGP calculations for a large network. Let alone a full BGP table. Network vendors have chosen and will choose procs and application-specific circuits adequate to the task for MD5 or SHA2. This is not a problem. If the ARM cannot hash quickly; the gear will likely contain logic circuits and software modules optimized for efficient hashing to achieve acceptable latency. Even that underpowered Pi Zero seems capable hashing within a 1 millisecond interval just fine using standard libraries. SHA-3 is not operationally relevant, but the slowest of those algorithms still speed measures as hashing 4 Kilobytes within a millisecond interval. $ ssh [email protected] 'sudo apt -y install botan >/dev/null 2>&1; tail -15 /proc/cpuinfo; botan speed --buf-size=1500 --msec=1 SHA-256 SHA-384 SHA-3' Enter passphrase for key '/home/shadowfax/.ssh/yubikey5ec01': Confirm user presence for key * User presence confirmed processor : 3 model name : ARMv7 Processor rev 4 (v7l) BogoMIPS : 38.40 Features : half thumb fastmult vfp edsp neon vfpv3 tls vfpv4 idiva idivt vfpd32 lpae evtstrm crc32 CPU implementer : 0x41 CPU architecture: 7 CPU variant : 0x0 CPU part : 0xd03 CPU revision : 4 Hardware : BCM2835 Revision : 902120 Serial : 000000002d61f097 Model : Raspberry Pi Zero 2 W Rev 1.0 SHA-256 hash buffer size 1500 bytes: 24.384 MiB/sec (0.026 MiB in 1.056 ms) SHA-384 hash buffer size 1500 bytes: 7.719 MiB/sec (0.009 MiB in 1.112 ms) SHA-3(512) hash buffer size 1500 bytes: 4.254 MiB/sec (0.004 MiB in 1.009 ms) $ -- -JA _______________________________________________ NANOG mailing list https://lists.nanog.org/archives/list/[email protected]/message/26VERQILEBYPG4QJ6KGMN2B445WPB72X/
