[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] more than 16 GB in a 32 Bit dom0
On Tue, Feb 08, 2011 at 12:32:19PM +0100, Daniel Bauer wrote: > From: "Ian Campbell" >> On Tue, 2011-02-08 at 10:42 +0000, Daniel Bauer wrote: >>> From: "Keir Fraser" >>> > On 08/02/2011 07:27, "Daniel Bauer" <mlist@xxxxxxxxxxx> wrote: >>> >> I've read in many posts, that XEN limits the 32 bit PAE kernel to >>> >> 16 >>> >> GB >>> >> RAM, but I don't find were to enable more. Starting linux without >>> >> XEN >>> >> shows the whole memory. Is there still no solution? >>> >> >>> >> I don't have the possibility to upgrade the server to 64 bit. >>> > >>> > Then no. >>> >>> maybe a silly question, but who sets this limit? IMHO xen, because a >>> "normal" bigmem kernel accepts upto 64 GB RAM. Is there really no >>> switch >>> to increase the RAM under a 32 bit kernel? >> >> The limitation is due to the 32 bit hypervisor, not the kernel. > > I know, but I don't find the switch to configure more RAM than 16 GB. I > thought that XEN limits it to 16 GB and I could change it and recompile > everything. > > >> In my experience a 32 bit (PAE) kernel running on a 64 bit hypervisor >> works just fine with up to 32GB. In theory up to 160GB is possible in >> the hypervisor<->PAE-kernel ABI but the kernel tends to run out of >> lowmem in the 50-60GB range depending on your .config -- this true of >> native too. > > It will be great if I could use 48 GB. > Hopefully you have realized having 48 GB of RAM on a 32bit Linux (no matter virtualized or not) will make it almost unusable? That's because you're running out of lowmem. -- Pasi _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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