| Summary: | with 25GB left kvm refused to create more guests | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 5 | Reporter: | Vivian Bian <vbian> | ||||||
| Component: | kvm | Assignee: | Andrea Arcangeli <aarcange> | ||||||
| Status: | CLOSED WONTFIX | QA Contact: | Virtualization Bugs <virt-bugs> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | medium | ||||||||
| Version: | 5.7 | CC: | aarcange, ajia, apevec, danken, dyuan, gcosta, jdenemar, juzhang, llim, michen, mkenneth, mshao, rhod, veillard, virt-maint | ||||||
| Target Milestone: | rc | ||||||||
| Target Release: | --- | ||||||||
| Hardware: | x86_64 | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2011-08-15 15:39:55 UTC | Type: | --- | ||||||
| Regression: | --- | Mount Type: | --- | ||||||
| Documentation: | --- | CRM: | |||||||
| Verified Versions: | Category: | --- | |||||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||||
| Bug Depends On: | |||||||||
| Bug Blocks: | 580949 | ||||||||
| Attachments: |
|
||||||||
each guest is with 512MB vMemory and 1 vCPU configured . Hello Vivan, could you post /proc/meminfo and ps xav too, when this happens? Created attachment 501038 [details] ps -axv and /proc/meminfo (In reply to comment #3) > Could you also check if "echo 1 >/proc/sys/vm/overcommit_memory" workaround > that and then everything works fine? with echo command executed , still meet kvm_create_vm: Cannot allocate memory Could not create KVM context errors Given our strict 5.8 bug fixing criteria, it seems as if we can survive without handling this issue. Closing. |
Created attachment 500001 [details] /var/log/messages Description of problem: Tried to create 1000 guests on the machine with 64 cores CPU and 512GB memory . But after successful creation of 512 guests , was told error: internal error Process exited while reading console log output: kvm_create_vm: Cannot allocate memory Could not create KVM context . When the error happened , checked with free # # free -lm total used free shared buffers cached Mem: 516238 490302 25935 0 1215 440519 Low: 516238 490302 25935 High: 0 0 0 -/+ buffers/cache: 48568 467670 Swap: 34239 0 34239 it says there are still 25GB left . command "top" shows every qemu-kvm process use 0.0% memory And also atm , selinux status was Permissive . Version-Release number of selected component (if applicable): kvm-83-230.el5 How reproducible: Always Steps to Reproduce: 1.try to start 1000 guests on 512GB memory machine 2. 3. Actual results: Expected results: Additional info: