[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Tags added: cscc -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Changed in: linux (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
Yes, we have closed the support case on our end at their request. Apparently increasing the reservation ratio has helped. Paulus - Hi! Thanks for the info and clearing up some of my misunderstandings. Great to hear from you and I hope things are going well at OzLabs :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Changed in: ubuntu-power-systems Status: Triaged => Opinion -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Attachment added: "var_log_libvirt_qemu.tar.bz2" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781038/+attachment/5164739/+files/var_log_libvirt_qemu.tar.bz2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
Based on the most recent information we have available to us (2018-05-09): 1. What is the server model and at least basic config info (I/O cards, firmware level)? Use /proc/meminfo, etc. Attach the syslog and the /var/log/libvirt/qemu logs. I am struggling a bit to determine the server model, but I'm uploading the relevant logs. 2. What is running on the host (at least uname -a). Sounds like from comment above like it's an older fix level, so let's get it updated to the curent level (and ensure the problem still exists) before proceeding: There is zero point in trying to figure out whether fixes that are known to exist in 16.04 are in this *particular* build level. Linux apsoscmp-as-a4p 4.4.0-109-generic #132-Ubuntu SMP Tue Jan 9 20:00:40 UTC 2018 ppc64le ppc64le ppc64le GNU/Linux I don't have any answers for (3); the user has been asked. ** Attachment added: "lspci" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781038/+attachment/5164737/+files/lspci -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Attachment added: "syslog" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781038/+attachment/5164740/+files/syslog -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Attachment added: "meminfo" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781038/+attachment/5164738/+files/meminfo -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Changed in: ubuntu-power-systems Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Changed in: linux (Ubuntu) Importance: Undecided => Critical ** Changed in: linux (Ubuntu) Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) => Canonical Kernel Team (canonical-kernel-team) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
Hi, This came up in the context of a customer issue. I have asked them if we can share anonymised data here, and I will pass on any response. >From my analysis of the code while working the case, it would seem that you could reproduce this by spinning up and tearing down VMs of varying memory sizes in order to fragment the CMA. It looks like PCI pass- through would exacerbate the issue, although I don't believe this was a factor in this instance. I wonder if this is fully 'solvable' per se - with memory overcommit it should be easy to simply run out of CMA space - but it should be possible to at least print much more helpful information either from the kernel or from qemu. Regards, Daniel -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
** Also affects: ubuntu-power-systems Importance: Undecided Status: New ** Changed in: ubuntu-power-systems Importance: Undecided => Critical ** Changed in: ubuntu-power-systems Assignee: (unassigned) => Canonical Kernel Team (canonical-kernel-team) ** Tags added: triage-g -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1781038] Re: KVM guest hash page table failed to allocate contiguous memory (CMA)
Hello Canonical, I've subscribed Daniel to this bug for his help getting additional information on the situation he was working. I expect he will add more folks from his end if necessary. Lastly, if you feel the bug should be marked as private for this discussion, please feel free to do that. Thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781038 Title: KVM guest hash page table failed to allocate contiguous memory (CMA) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1781038/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
