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 sshd processes (and therefore, the children) which however may not be sufficient and could require to negative-nice some other processes or kernel tasks as well, so see if your scenario can just positive-nice the load instead. gl hf, //mirabilos -- Infrastrukturexperte • tarent solutions GmbH Am Dickobskreuz 10, D-53121 Bonn • http://www.tarent.de/ Telephon +49 228 54881-393 • Fax: +49 228 54881-235 HRB AG Bonn 5168 • USt-ID (VAT): DE122264941 Geschäftsführer: Dr. Stefan Barth, Kai Ebenrett, Boris Esser, Alexander Steeg **************************************************** /⁀\ The UTF-8 Ribbon ╲ ╱ Campaign against Mit dem tarent-Newsletter nichts mehr verpassen: ╳ HTML eMail! Also, https://www.tarent.de/newsletter ╱ ╲ header encryption! **************************************************** _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
