Hello, Last night I upgraded a server to CentOS 5.2. The server has 16GB of RAM. Now that it's running 2.6.18-92.1.6.el5xen only 8GB is reported to exist. # cat /proc/meminfo MemTotal: 8818688 kB MemFree: 3730124 kB Buffers: 202004 kB Cached: 4086788 kB SwapCached: 0 kB Active: 1551480 kB Inactive: 2958196 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 8818688 kB LowFree: 3730124 kB SwapTotal: 8388600 kB SwapFree: 8388600 kB Dirty: 7348 kB Writeback: 0 kB AnonPages: 220788 kB Mapped: 46948 kB Slab: 137404 kB PageTables: 29012 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 12797944 kB Committed_AS: 756072 kB VmallocTotal: 34359738367 kB VmallocUsed: 5004 kB VmallocChunk: 34359733235 kB However, dmesg appears to report something else: # dmesg | grep Memory Memory: 15506152k/15899468k available (2417k kernel code, 384480k reserved, 1350k data, 176k init) I looked in the messages file for complaints and didn't see anything that strikes me as unusual. How much memory is available? Is this a known issue?