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?
On Sat, Jul 12, 2008 at 7:11 PM, JJB jack@internetguy.net wrote:
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?
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
I think there was a topic like this about a month ago, please search the list archieves.
Cheers.
Victor Padro wrote:
On Sat, Jul 12, 2008 at 7:11 PM, JJB <jack@internetguy.net mailto:jack@internetguy.net> wrote:
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. ...snip... How much memory is available? Is this a known issue?I think there was a topic like this about a month ago, please search the list archieves.
Cheers.
In case he didn't find it, I was the one that posted the original issue. Turns out that Xen allocates memory to domU's and doesn't release it back to dom0 even if you stop the VM's. Top only reports the memory available to dom0. The xen tools will show the proper amount of memory.
Russ
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JJB -
Ruslan Sivak -
Victor Padro