On 31/07/2025 16:00, Thomas Lamprecht wrote: > On Thu, 31 Jul 2025 15:51:42 +0200, Friedrich Weber wrote: >> Pressure stall information are actually in percent. This is not >> mentioned explicitly in the documentation, but e.g. in the kernel >> source [1]: >> >>> The percentage of wall clock time spent in those compound stall >>> states gives pressure numbers between 0 and 100 for each resource, >>> where the SOME percentage indicates workload slowdowns and the FULL >>> percentage indicates reduced CPU utilization: >>> >>> %SOME = time(SOME) / period >>> %FULL = time(FULL) / period >> >> [...] > > This was a bit strange for me, I seemingly ingrained some wrong knownledge > when > getting first exposed to PSI when that was a new thing back in 2019 or so, > either the docs where worded a bit differently or I just read a bit to much > into the wording (more likely), anyhow thanks for clarifying this, one thing > that I'm still wondering is this then percent for real (i.e. * 100 already) or > a ratio? Or would we need to do *= 100 scaling?
I think it's fine now -- at least for /proc/pressure/*, the range is 0..100, e.g. when running a fio in parallel: # cat /proc/pressure/io some avg10=39.42 avg60=21.00 avg300=5.98 total=49530229 full avg10=39.41 avg60=20.94 avg300=5.96 total=48766096 And this is also correctly displayed in the GUI now. > > Anyway, as this restores the status quo with rationale it's already an > improvement as is, so: Applied, thanks! Thanks! > > [1/1] ui: RRD graphs: display PSI as percent > commit: 2753e104a1e6effa4a0ae995f13636a02f3557af _______________________________________________ pve-devel mailing list pve-devel@lists.proxmox.com https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
