Hi,
I launched an AWS instance `t2.medium` (use CentOS 7 image "ami-7abd0209", product code: https://aws.amazon.com/marketplace/pp/B00O7WM7QW), which is supposed to have 4GB Memory in total, but turn out it is only "3.5GB".
``` $ free -h total used free shared buff/cache available Mem: 3.5G 441M 1.4G 16M 1.6G 2.7G Swap: 0B 0B 0B ```
It does not happen to AWS Ubuntu 16.04.
``` $ free -h total used free shared buff/cache available Mem: 3.9G 49M 3.3G 5.5M 518M 3.7G Swap: 0B 0B 0B ```
This seems to happen to all AWS CentOS image, regardless which instance type it is.
On 1 August 2016 at 07:30, Dũng Trần-Dương chris.duong83@gmail.com wrote:
Hi,
I launched an AWS instance `t2.medium` (use CentOS 7 image "ami-7abd0209", product code: https://aws.amazon.com/marketplace/pp/B00O7WM7QW), which is supposed to have 4GB Memory in total, but turn out it is only "3.5GB".
A rough guess would be that the system has reserved some memory for crashkernel but that is a guess. I would look at /proc/commandline to see what the kernel is starting up with.
Hi Stephen,
I've just tested in Virtualbox, same thing happened to CentOS but the loss is lesser than in AWS.
Both machines are allocated with 4096MB in Vagrantfile.
``` [vagrant@my-multi-centos-72 ~]$ cat /proc/meminfo MemTotal: 3882384 kB MemFree: 3527648 kB
vagrant@my-multi-ubuntu-1604:~$ cat /proc/meminfo MemTotal: 4046708 kB MemFree: 3695204 kB ```
On Mon, Aug 1, 2016 at 8:29 PM Stephen John Smoogen smooge@gmail.com wrote:
On 1 August 2016 at 07:30, Dũng Trần-Dương chris.duong83@gmail.com wrote:
Hi,
I launched an AWS instance `t2.medium` (use CentOS 7 image
"ami-7abd0209",
product code: https://aws.amazon.com/marketplace/pp/B00O7WM7QW), which
is
supposed to have 4GB Memory in total, but turn out it is only "3.5GB".
A rough guess would be that the system has reserved some memory for crashkernel but that is a guess. I would look at /proc/commandline to see what the kernel is starting up with.
-- Stephen J Smoogen. _______________________________________________ CentOS-virt mailing list CentOS-virt@centos.org https://lists.centos.org/mailman/listinfo/centos-virt
-
Dũng Trần-Dương -
Stephen John Smoogen