search for: sched_fixed

Good morning! We're experiencing rather very bad latency spikes on busy Linux systems, for example if one machine is the jumphost (ssh -J) for a few hundred connections, while at the same time handles CPU intensive tasks. Would RT/Linux SCHED_FIXED or SCHED_RR be of help in such a case, e.g. put all ssh processes into the SCHED_FIXED scheduling class, with a priority higher than the non-interactive compute processes? Also, do I interpret it correctly that each forwarded TCP connection has its own process?! Ced -- Cedric Blancher <cedric...

On Thu, 10 Aug 2023, Cedric Blancher wrote: >We're experiencing rather very bad latency spikes on busy Linux >systems, for example if one machine is the jumphost (ssh -J) for a few >hundred connections, while at the same time handles CPU intensive >tasks. > >Would RT/Linux SCHED_FIXED or SCHED_RR be of help in such a case, e.g. Did you already check the old and tried method of nice(2)? If the other load is CPU-intensive, this is usually sufficient. Normally you?d nice the CPU-intensive load (so anything else on the system is not affected), but you can also negative-nice the s...