Most recent kernel where this bug did not occur: ?
Distribution: Debian Sarge 3.1 + custom kernel 2.6.17.11
Hardware Environment: HP XW6200 dual CPU + 5gig RAM
Software Environment:
Problem Description:

Hi all,

I've been running into a few troubles on our HP XW6200 workstations.
Theses workstations are either running with 4gig or 5gig of ram (depending of
the workstation..).  If the kernel is not set-up into "bigmem" (64gig) then I
can only see about 3gig of ram instead of at least 4gig? 

Here is the meminfo WITHOUT 64gig highmem enabled:
MemTotal:      3370236 kB
MemFree:       3136524 kB
Buffers:          8656 kB
Cached:         119728 kB
SwapCached:          0 kB
Active:         149880 kB 
Inactive:        45432 kB
HighTotal:     2228180 kB
HighFree:      2031484 kB
LowTotal:      1142056 kB
LowFree:       1105040 kB
SwapTotal:     2048276 kB
SwapFree:      2048276 kB
Dirty:               4 kB 
Writeback:           0 kB
Mapped:          85092 kB
Slab:            17796 kB
CommitLimit:   3733392 kB
Committed_AS:   157468 kB
PageTables:        620 kB
VmallocTotal:   114680 kB
VmallocUsed:     43564 kB 
VmallocChunk:    66036 kB


And here is the same system WITH 64gig highmem enabled:
MemTotal:      5189828 kB
MemFree:       3583332 kB
Buffers:        152364 kB
Cached:        1201992 kB
SwapCached:          0 kB 
Active:        1098516 kB
Inactive:       368720 kB
HighTotal:     4325332 kB
HighFree:      3002304 kB
LowTotal:       864496 kB
LowFree:        581028 kB
SwapTotal:     2048276 kB
SwapFree:      2048276 kB 
Dirty:            7672 kB
Writeback:           0 kB
Mapped:         166440 kB
Slab:           120676 kB
CommitLimit:   4643188 kB
Committed_AS:   299400 kB
PageTables:       2408 kB
VmallocTotal:   118776 kB 
VmallocUsed:     43528 kB
VmallocChunk:    70132 kB