T3: use 1.2 TB with one PT device - THP=off #1: 476 seconds #2: 31 seconds #3: 20 seconds
ubuntu@akis:~$ echo never | sudo tee /sys/kernel/mm/transparent_hugepage/enabled never ubuntu@akis:~$ cat /sys/kernel/mm/transparent_hugepage/enabled always madvise [never] Samples: 88K of event 'cycles:ppp', Event count (approx.): 44410625251 Overhead Shared Object Symbol 22.12% [kernel] [k] _raw_spin_lock 14.56% [kernel] [k] try_charge 13.00% [kernel] [k] clear_page_erms 11.48% [kernel] [k] get_page_from_freelist 8.10% [kernel] [k] handle_pte_fault 2.04% [kernel] [k] __pagevec_lru_add_fn 1.80% [kernel] [k] follow_page_pte We still see page scrub and mapping initialization, but no more transparent pages. As expected this changed the perf profile but didn't provide a lot of gain (actually a loss on init time and later on ). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1838575 Title: passthrough devices cause >17min boot delay To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1838575/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
