------- Comment From [email protected] 2017-10-17 07:09 EDT------- FWIW, I checked on my system and the aio-nr only increases for disks with io='native' (libvirt) or aio='native' (qemu command line)
QEMU does an io_setup of 128 events per disk. But with current kernels this increases this by 2048 on my system. Looks like we need commit 2a8a98673c13cb2a61a6476153acf8344adfa992 Author: Mauricio Faria de Oliveira <[email protected]> AuthorDate: Wed Jul 5 10:53:16 2017 -0300 Commit: Benjamin LaHaise <[email protected]> CommitDate: Thu Sep 7 12:28:28 2017 -0400 fs: aio: fix the increment of aio-nr and counting against aio-max-nr to fix the accounting. This will still result in a limitation of 64k/128 = 512 disk for ALL guests if nothing else uses aio contexts. Since aio context do not preallocate any ressources What about - applying above fix - increase to 128k to have enough capacity. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1717224 Title: virsh start of virtual guest domain fails with internal error due to low default aio-max-nr sysctl value To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1717224/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
