[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] 5x dom0 memory increase from Xen/Linux 3.4/2.6.18 to 4.1/3.0.0
On Thu, Jun 16, 2011 at 01:58:25PM +0100, Anthony Wright wrote: > I have a fairly old machine with 512M of RAM that I use for testing. Under > Xen 3.4 with the 2.6.18 linux kernel it would happily work with dom0_mem=50M, > leaving 450M for VMs. I am in the process of upgrading to Xen 4.1 with a > stock 3.0.0-rc3 linux kernel (with konrad's vga-support patch). This > combination however requires dom0_mem=250M to work leaving only 250M for the > VMs (if I try to set dom0_mem any lower I get a kernel panic early on in the > kernel boot phase). > > This is an increase of 5x between the two versions, and I wondered if there's > an explanation why. Is it possible to reduce the memory requirements, or do I > have to learn to live with it. The SWIOTLB is taking a 64MB chunk out of it. You could lower that by 'swiotlb=2048' or so. Also make sure to compile the CONFIG_XEN_MAX_DOMAIN_MEMORY from 128GB down to say 1. Besides that .. run with 'memblock=debug loglevel=10 initcall_debug debug' and see what other regions memblock reserves that could be shrunk. > > thanks, > > Anthony Wright > > > _______________________________________________ > 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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