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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 0006893 | Xen4 | [CentOS-6] -OTHER | public | 2014-01-10 12:57 | 2014-01-10 12:59 | ||||||||
| Reporter | JohnnyHughes | ||||||||||||
| Priority | normal | Severity | minor | Reproducibility | always | ||||||||
| Status | new | Resolution | open | ||||||||||
| Product Version | [CentOS-6] 6.5 | ||||||||||||
| Target Version | [CentOS-6] 6.5 | Fixed in Version | |||||||||||
| Summary | 0006893: xen_balloon errors in syslog | ||||||||||||
| Description | This mailing list thread discusses the issue: http://lists.centos.org/pipermail/centos-virt/2014-January/003579.html =============== System RAM resource [mem 0xc8000000-0xcfffffff] cannot be added xen_balloon: reserve_additional_memory: add_memory() failed: -17 | ||||||||||||
| Tags | No tags attached. | ||||||||||||
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JohnnyHughes (administrator) 2014-01-10 12:58 |
This from David Vrabel on the mail list: Drivers (e.g., blkback) use ballooned pages for use for foreign mappings. Depending on dom0_mem options there may be no ballooned memory available at boot and dom0's balloon is increased by allocating pages. This decreases current_kb. The balloon driver then tries to decrease the balloon to match the target but it can only do this by hotplugging new memory. A bug in the balloon driver means the location of this memory overlaps with an address range that is already in use and the hotplug will fail. As a workaround you can boot dom0 with a suitable amount of pre-ballooned memory with: dom0_mem=3G,max:4G You may need to experiment with the max: value. |
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JohnnyHughes (administrator) 2014-01-10 12:59 |
I would suggest that approx. 16 MB per VM is a reasonable amount of pre-ballooned memory. e.g., dom0_mem=3G,max:4G would allow for approx. 64 VMs. |
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| Issue History |
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| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2014-01-10 12:57 | JohnnyHughes | New Issue | |
| 2014-01-10 12:58 | JohnnyHughes | Note Added: 0018820 | |
| 2014-01-10 12:59 | JohnnyHughes | Note Added: 0018821 | |
| Issue History |
