On Tue, Jul 03, 2007 at 12:27:54AM -0400, Kanwar Ranbir Sandhu wrote: > Hello, > > I'm running a FC6 dom0, with kernel version, > kernel-xen-2.6.19-1.2895.fc6 on a Dell PowerEdge 1600SC. I just > upgraded it from 1 GB (2 x 512 MB modules) to 3 GB (2 x 1 GB + 2 x 512 > MB). The BIOS sees all of the ram, but kernel does not. All I see when > I run free is this: > > total used free shared buffers > cached > Mem: 2454528 207876 2246652 0 11032 > 47380 > -/+ buffers/cache: 149464 2305064 > Swap: 524280 0 524280 > > It looks like 512 MB is missing. Let me guest - you are running a 32-bit kernel on the machine ? If so the problem is likely that the BOIS is remapping a portion of memory above the 4 GB mark, to make room for PCI device DMA zones. A 32-bit kernel though can only access physical addrs upto 4 GB, so it can't see the remapped memory. > BTW, I appear to be having problems with one of my domUs now too (after > the ram upgrade). A PCI device I was handing to the domU is now causing > the domU kernel to panic, crashing the domU. I'll try to get a copy of > the error message. PCI device mapping to DomUs is insanely fragile, whether it works or not is mostly luck. In this case since you added more memory, the locaiton of the PCI device's DMA zone probably changed and by (bad) luck is no longer accessible to the DomU or something like that. Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| -- Fedora-xen mailing list Fedora-xen@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-xen
