[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] libxl videoram for cirrus graphics
On Tue, 17 Sep 2013, Ian Campbell wrote: > On Tue, 2013-09-17 at 12:54 +0000, Rob Hoes wrote: > > Hi, > > > > The videoram setting in xl config files is documented as follows: > > > > " > > videoram=MBYTES > > > > Sets the amount of RAM which the emulated video card will contain, > > which in turn limits the resolutions and bit depths which will be > > available. The default amount of video ram for stdvga is 8MB which is > > sufficient for e.g. 1600x1200 at 32bpp and videoram option is > > currently working only when using the qemu-xen-traditional > > device-model. > > > > When using the emulated Cirrus graphics card (vga="cirrus") the > > amount of video ram is fixed at 4MB which is sufficient for 1024x768 > > at 32 bpp and videoram option is currently working only when using the > > upstream qemu-xen device-model. > > " > > > > XenServer also uses a default of 4MB video ram for cirrus graphics. > > > > However, when I use xl to create a VM with cirrus graphics, I get 8MB > > of video RAM by default. Moreover, setting it to videoram=4 in the > > config file leads to complaints from libxl: > > > > libxl_create.c:228:libxl__domain_build_info_setdefault: videoram must > > be at least 8 mb > > > > Is there a bug in the logic in libxl_create.c? > > Either the docs of the code or both would seem to be wrong. Since you > say you happily use 4MB in XenServer I guess it is both? > > I noticed that the docs also say the amount is fixed, but that's not > what the code implements either.. > > I'm not really sure who, if anyone, might know definitively what is > going on here. Stefano has some involvement in this video mem stuff once > upon a time and Ian is the qemu-trad maintainer, so I've CCdthem > both ;-) AFAICT we always had 8 mb for Cirrus in libxl. I am not really sure where this discrepancy between the docs and the code comes from. I think that if 4mb actually works fine with different guests OSes then we should allow it. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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