Thank you, didn't know that "System management units" could steal CPU!!! That is scary
On Thu, Jun 23, 2022 at 8:42 PM Stephen Hemminger <[email protected]> wrote: > > On Thu, 23 Jun 2022 20:03:02 +0200 > Antonio Di Bacco <[email protected]> wrote: > > > I'm running a DPDK thread on an isolated core. I also set some flags > > that could help keeping the core at rest on linux like: nosoftlockup > > nohz_full rcu_nocbs irqaffinity. > > > > Unfortunately the thread gets some interruptions that stop the thread > > for about 20-30 micro seconds. This seems smal but my application > > suffers a lot. > > > > I also tried to use rte_thread_set_priority that indeed has a strong > > effect but unfortunately creates problems to Linux (like network not > > working). > > > > Is there any other knob that could help running the DPDK thread with > > minimum or no interruptions at all? > > Look with perf and see what is happening. > First check for interrupt affinity. > Don't try real time priority. > > The other thing to look for would be any BIOS settings. > Some system management units can take away CPU silently for polling > some internal housekeeping.
