Bug 623523
| Summary: | Wrong size of video memory setting in guest | ||||||||
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| Product: | Red Hat Enterprise Linux 6 | Reporter: | Nan Zhang <nzhang> | ||||||
| Component: | libvirt | Assignee: | Daniel Veillard <veillard> | ||||||
| Status: | CLOSED NOTABUG | QA Contact: | Virtualization Bugs <virt-bugs> | ||||||
| Severity: | medium | Docs Contact: | |||||||
| Priority: | low | ||||||||
| Version: | 6.0 | CC: | berrange, eblake, llim, tyan, xen-maint | ||||||
| Target Milestone: | rc | Keywords: | RHELNAK | ||||||
| Target Release: | --- | ||||||||
| Hardware: | All | ||||||||
| OS: | Linux | ||||||||
| Whiteboard: | |||||||||
| Fixed In Version: | Doc Type: | Bug Fix | |||||||
| Doc Text: | Story Points: | --- | |||||||
| Clone Of: | Environment: | ||||||||
| Last Closed: | 2010-08-23 05:38:07 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: | |||||||||
| Attachments: |
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Created attachment 438333 [details]
Xorg.0.log for cirrus
This issue has been proposed when we are only considering blocker issues in the current Red Hat Enterprise Linux release. ** If you would still like this issue considered for the current release, ask your support representative to file as a blocker on your behalf. Otherwise ask that it be considered for the next Red Hat Enterprise Linux release. ** Sorry, I put a wrong number for linux guest, the correct size as following. On Linux guest: ... (II) VESA(0): VESA VBE Total Mem: 4096 kB ... I don't think it's a bug. We looked at it actually while I was in Beijing, and the driver on XOrg for cirrus was always limiting the memory to 4MB. I would not be surprized if the driver on Windows didn't do the same, because all real cirrus logic based card only had 4MB of memory at the maximum. And from my recollection of the mid-90's a graphic card like this with 4MB was rather high-end, then other chipset were developped taking advantage of more memory. So I think this is a limitation of the Cirrus Logic drivers both for Linux and Windows, I don't think it's a libvirt bug actually. In any case I don't see this fixed at the libvirt level or for 6.0 Daniel Daniel, But the value vram='9216' doesn't make sense in XML description, if we should make some changes in XML to corresponding with the real allocated memory size? Thanks, Neil This is a known limitation of the Cirrus card in QEMU, you can't change the VRAM. This bit of XML was added for the SVGA and SPICE QXL cards which are configurable. Hopefully we can make Cirrus configurable too in the future. OK, thanks for the explanation! Close it with NOTABUG. |
Created attachment 438332 [details] Windows VRAM size Description of problem: Inconsistent VRAM between guest and XML definition. Version-Release number of selected component (if applicable): qemu-kvm-0.12.1.2-2.109.el6.x86_64 libvirt-0.8.1-23.el6.x86_64 kernel-2.6.32-59.1.el6.x86_64 How reproducible: Always Steps to Reproduce: Set video ram in guest: <video> <model type='cirrus' vram='9216' heads='1'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> </video> Actual results: On Linux guest: (II) VESA(0): VESA VBE Total Mem: 16384 kB On Windows guest: Memory Size: 4 MB Expected results: The guest video memory should be consistent with specified. Additional info: Attached log and screenshot for reference.