Troubleshoot R4 EC2 Instance RAM Allocation Issues
R4 instances that are running RHEL 7.0 to 7.3 will show missing RAM even though the appropriate memory size was allocated by Xen. The missing memory is due to a Red Hat balloon driver bug (1437309) which was fixed in Red Hat 7.4.
In the kernel 3.10.0-514.21.2.el7.x86_64, which is the default for Red Hat 7.3, the balloon driver's initial memory value includes non-RAM ranges. As a result, the initial memory target based on the instance type will appear to be smaller than what balloon driver perceives to be the current number of available pages. Thus it will balloon down "extra" pages, decreasing amount of available memory.
In RHEL version 7.4, the balloon driver code is set to reflect the actual number of existing RAM pages that can be utilized by the instance.
To fix the balloon driver issue, update your Red Hat kernel's version.
Note: The balloon driver issue doesn't exist in Amazon Linux, because the balloon driver is disabled on Amazon Linux instances by default.
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