Bug 1095907
| Summary: | VDSM is consuming a lot of cpu time even with no active VMs | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Virtualization Manager | Reporter: | rhev-integ |
| Component: | vdsm | Assignee: | Nir Soffer <nsoffer> |
| Status: | CLOSED ERRATA | QA Contact: | Aharon Canan <acanan> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 3.3.0 | CC: | aberezin, aburden, amureini, bazulay, eedri, gwatson, iheim, loberman, lpeer, mkalinin, ngupta, nsoffer, obasan, scohen, smizrahi, yeylon |
| Target Milestone: | --- | Keywords: | ZStream |
| Target Release: | 3.3.3 | ||
| Hardware: | x86_64 | ||
| OS: | Linux | ||
| Whiteboard: | storage | ||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: |
* Red Hat Enterprise Virtualization Hypervisor 6.5 added support for memory-based file systems (for the purposes of testing), which included code with O(N^2) complexity. This introduced performance issues, such as high cpu consumption by vdsm, in certain environments that utilized numerous storage domains. Now, the additional support for memory-based file systems has been disabled and does not contribute to performance problems.
|
Story Points: | --- |
| Clone Of: | 1090664 | Environment: | |
| Last Closed: | 2014-05-27 08:57:39 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | Storage | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 1090664 | ||
| Bug Blocks: | |||
|
Comment 1
Nir Soffer
2014-05-09 18:59:02 UTC
Marina, until 3.3.4 is released, the attached patch should be used on customers machines with this problem. Nir, Thank you! How to verify this: Reproducing with old version: - You probbably cannot reproduce this - only the customer could reproduce on his RHEV-H systems. - Like new version, but cpu usage should be very high (we have seen 240% cpu on 4 core machine) Testing new version: 1. set up a RHEV-H host system with 30 ISCIS storage domains 2. Activate the host and wait until it it become the spm 3. Check cpu usage, should be 5-15% on 8 core system 4. Standard sanity tests as needed (e.g create vm, run it, delete it) Hint for trying to reproduce: Try to add lot of (100?) mounts to the system. The expensive code in vdsm is looking up the mountpoint for a file and getting its filesystem type. on 4 core machine, using is36.4 - verified 1. create ISCSI DC, 2 hosts 2. create 30 ISCSI storage domains cpu - 12.8% idle Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHBA-2014-0548.html |