[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Limit on the number of grant-table mapped pages
Hi Wei,The 128 page limit in gntdev was chosen to provide a useful number of mappings without occupying too much kernel memory, and you can safely increase its value. Future work for gntdev includes making this size configurable at runtime and/or making it resizable. The limiting factor seems to be the maximum number of maptrack entries, which appears to be configurable by redefining the MAX_MAPTRACK_TO_GRANTS_RATIO, and setting the gnttab_max_nr_frames parameter. Regards, Derek Murray. On 17 Oct 2007, at 19:24, wei huang wrote: Hi list,I am using xen-3.1 and am particularly interested in the recently added user-space grant table device. I am trying to build a small communicationchannel for passing data among user level processes.I find that the maximum number pages that can be mapped through the granttable device is currently hard coded to 128. And I was under theimpression that earlier Xen supports 1k pages (per domain) to be mapped toother domains in maximum. Thus, I am asking if it is possible to increase this limit? And if so,what is the current upper limit that we can mapped from each domain? Or isit simply a macro define somewhere in the Xen kernel? Thanks a lot! -- Wei _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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