On Tue, 27 Jan 2004, Chiu, PCM (Peter) wrote: > Thanks, Joel, > > My experience on a dual Xeon 2.4GHz cpus, 6GB memory with RH 9 and bigmem > kernel > allows us to access physical memory size up to 3GB but not beyond. on a per process basis or overall? it should be work given what's documented, individual processes will never exceed 3GB though... > Do you know if it is possible to do so under FC1, or RHES, or none of them? fc1 has no bigmem kernels... you you get to rebuilt the normal one with 64GB supported turned on... RHES you get support for that from the vendor... ymmv > Peter > > -----Original Message----- > From: fedora-list-admin@xxxxxxxxxx [mailto:fedora-list-admin@xxxxxxxxxx] On > Behalf Of Joel Jaeggli > Sent: 26 January 2004 17:27 > To: 'fedora-list@xxxxxxxxxx' > Subject: RE: maximum memory capacity > > > On Mon, 26 Jan 2004, Chiu, PCM (Peter) wrote: > > > Thanks, my understanding on 32-bit based platforms, the limitation is > > 4GB. > > linux on x86 can support up to 64GB of ram... address space is 4GB so not > all of it gets permently mapped... kernels aren't generally compiled for > 64GB because the address extensions will prevent the kernel from booting on > cpu's that don't support it... that said you'll have a fair performance > tradeoff to consider with more than 4GB of ram (3%-6% more overhead > depending on the application). also the most memory an individual process > can use is 3GB of ram. > > > Opterons or Itanium can lift this limitation. > > The opteron's long mode supports 1TB of addressable memory the current > 2.6.X support 512GB as I understand it... populating an opteron mainboard > with more than 16-20GB of ram (tyan s4880 has 10 dimm sockets) is left as > an exerercise for the reader. > > > But not sure what their latest status. > > > > Peter > > -----Original Message----- > > From: fedora-list-admin@xxxxxxxxxx > > [mailto:fedora-list-admin@xxxxxxxxxx] On Behalf Of WipeOut > > Sent: 26 January 2004 15:02 > > To: fedora-list@xxxxxxxxxx > > Subject: Re: maximum memory capacity > > > > > > Chiu, PCM (Peter) wrote: > > > > >Can anyone tell me the maximum physical and virtual memory sizes > > >supported under FC1? > > > > > >I am trying to work out the technical differences between RHES and > > >FC1 > > >to enable us to choose the appropriate version to use. I am aware of > > >the initial licenses and maintenance issues. > > > > > >Many Thanks. > > > > > >Peter > > > > > > > > > > > > > > Something says to me that the standard Fedora kernel is setup for 4GB > > (I > > amy be wrong).. But there is nothing stopping you building a kernel for > > larger amounts of memory.. > > > > later.. > > > > > > > > -- -------------------------------------------------------------------------- Joel Jaeggli Unix Consulting joelja@xxxxxxxxxxxxxxxxxxxx GPG Key Fingerprint: 5C6E 0104 BAF0 40B0 5BD3 C38B F000 35AB B67F 56B2
