Bug 662058
| Summary: | qemu-img convert poor performance | ||
|---|---|---|---|
| Product: | Red Hat Enterprise Linux 6 | Reporter: | RHEL Program Management <pm-rhel> |
| Component: | qemu-kvm | Assignee: | Virtualization Maintenance <virt-maint> |
| Status: | CLOSED ERRATA | QA Contact: | Virtualization Bugs <virt-bugs> |
| Severity: | high | Docs Contact: | |
| Priority: | high | ||
| Version: | 6.1 | CC: | abaron, cpelland, iheim, knoel, kwolf, michen, mjenner, mkenneth, oramraz, plyons, pm-eus, tburke, virt-maint, wquan, ykaul |
| Target Milestone: | rc | Keywords: | ZStream |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | qemu-kvm-0.12.1.2-2.113.el6_0.5 | Doc Type: | Bug Fix |
| Doc Text: |
Previously, the conversion of a disk image by using the "qemu-img convert" command may have been significantly slow. With this update, various patches have been applied to improve the performance of the above command.
|
Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-01-10 16:09:26 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | 653536 | ||
| Bug Blocks: | |||
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Description
RHEL Program Management
2010-12-10 13:18:31 UTC
For qemu-kvm-0.12.1.2-2.113.el6_0.4:
# time strace -o 113_4.log qemu-img convert -f qcow2 /mnt/rhel39-32.qcow2 -O qcow2 /mnt/113_4.qcow2
real 5m8.992s
user 0m21.775s
sys 1m8.603s
# grep fdatasync 113_4.log |wc -l
101689
For qemu-kvm-0.12.1.2-2.113.el6_0.5:
# time strace -o 113_5.log qemu-img convert -f qcow2 /mnt/rhel39-32.qcow2 -O qcow2 /mnt/113_5.qcow2
real 2m10.605s
user 0m18.323s
sys 0m41.449s
# grep fdatasync 113_5.log |wc -l
0
# /usr/libexec/qemu-kvm --help |grep cache
[,cache=writethrough|writeback|none|unsafe][,format=f]
Based on the above, this bug is fixed.
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.
New Contents:
Previously, the conversion of a disk image by using the "qemu-img convert" command may have been significantly slow. With this update, various patches have been applied to improve the performance of the above command.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-0012.html |