On Wed, 2005-09-07 at 11:03 -0400, Matt Roth wrote: > List members, > > I have a Dell PowerEdge 6850 running Fedora Core 3 with 12 GBytes of > RAM. Due to limitations of a PCI card I'm installing, I wish to limit > the system memory to just under 4 GBytes using the kernel parameter > "mem". When I do this, the machine boots fine and the PCI card operates > properly, but "/proc/meminfo" and "free" report 2.6 GBytes of available > memory. > What pci card would cause you to need to limit the kernel access to memory? > Can anyone explain this situation or help me resolve it? If you need > anymore information than I have supplied, please request it. > > System information: > uname -a > Linux immlx15.imm1 2.6.12-1.1376_FC3smp #1 SMP Fri Aug 26 23:51:16 EDT > 2005 x86_64 x86_64 x86_64 GNU/Linux > > /proc/cmdline > ro root=LABEL=/ quiet mem=4095M > Maybe because you are slightly under the even 4G boundary it has to drop lower to a logical boundary for memory access. Just a guess since I have never needed to use that trick on booting. > /proc/meminfo > MemTotal: 2809040 kB > MemFree: 2693600 kB > Buffers: 13308 kB > Cached: 35052 kB > SwapCached: 0 kB > Active: 42056 kB > Inactive: 29236 kB > HighTotal: 0 kB > HighFree: 0 kB > LowTotal: 2809040 kB > LowFree: 2693600 kB > SwapTotal: 2096472 kB > SwapFree: 2096472 kB > Dirty: 60 kB > Writeback: 0 kB > Mapped: 28440 kB > Slab: 19728 kB > CommitLimit: 3500992 kB > Committed_AS: 48392 kB > PageTables: 1740 kB > VmallocTotal: 34359738367 kB > VmallocUsed: 275932 kB > VmallocChunk: 34359461883 kB > HugePages_Total: 0 > HugePages_Free: 0 > Hugepagesize: 2048 kB > > free -k > total used free shared buffers cached > Mem: 2809040 115136 2693904 0 13348 35012 > -/+ buffers/cache: 66776 2742264 > Swap: 2096472 0 2096472 > > Thank you, > > Matthew Roth > InterMedia Marketing Solutions > Software Engineer and Systems Developer >
