On Mon 17-09-18 09:04:02, Stefan Priebe - Profihost AG wrote: > Hi, > > i had multiple memory stalls this weekend again. All kvm processes where > spinning trying to get > 100% CPU and i was not able to even login to > ssh. After 5-10 minutes i was able to login. > > There were about 150GB free mem on the host. > > Relevant settings (no local storage involved): > vm.dirty_background_ratio: > 3 > vm.dirty_ratio: > 10 > vm.min_free_kbytes: > 10567004 > > # cat /sys/kernel/mm/transparent_hugepage/defrag > always defer [defer+madvise] madvise never > > # cat /sys/kernel/mm/transparent_hugepage/enabled > [always] madvise never > > After that i had the following traces on the host node: > https://pastebin.com/raw/0VhyQmAv I would suggest reporting this in a new email thread. I would also recommend to CC kvm guys (see MAINTAINERS file in the kernel source tree) and trace qemu/kvm processes to see what they are doing at the time when you see the stall. -- Michal Hocko SUSE Labs
