| Measurement |
Description |
Measurement
Unit |
Interpretation |
| No_mem_errors |
Counts the number
of buffer creation
failures due to lack of free memory in the router |
Number
|
Lack of free memory can result in poor performance
by a router - packet drops, packet processing slowdown, etc. can
happen. By monitoring when memory errors happen, an administrator can
proactively detect performance bottlenecks caused by a router. If
memory errors occur often, consider upgrading the memory on the
router. |
| Small_buffer_misses |
Counts the number
of allocations that failed because there were no small buffers
available |
Number
|
Ideally, the small buffer miss count should be 0.
Repeated buffer misses indicates a memory bottleneck in the router.
Alternatively, the maximum number of small buffers set when
configuring the router may be too low for the traffic being handled. |
| Medium_buffer_misses |
Counts the number
of allocations that failed because there were no medium buffers
available |
Number
|
Ideally, the medium buffer miss count should be 0.
Repeated buffer misses indicates a memory bottleneck in the router.
Alternatively, the maximum number of medium buffers set when
configuring the router may be too low for the traffic being handled. |
| Big_buffer_misses |
Counts the number
of allocations that failed because there were no big buffers
available |
Number
|
Ideally, the big buffer miss count should be 0.
Repeated buffer misses indicates a memory bottleneck in the router.
Alternatively, the maximum number of big buffers set when
configuring the router may be too low for the traffic being handled. |
| Large_buffer_misses |
Counts the number
of allocations that failed because there were no large buffers
available |
Number
|
Ideally, the large buffer miss count should be 0.
Repeated buffer misses indicates a memory bottleneck in the router.
Alternatively, the maximum number of large buffers set when
configuring the router may be too low for the traffic being handled. |
| Huge_buffer_misses |
Counts the number
of allocations that failed because there were no huge buffers
available |
Number
|
Ideally, the large buffer miss count should be 0.
Repeated buffer misses indicates a memory bottleneck in the router.
Alternatively, the maximum number of huge buffers set when configuring
the router may be too low for the traffic being handled. |
| Buffer_hits |
The total number of buffer hits |
Number
|
Ideally, the value of this measure should be high. A very low value could indicate that many allocations have failed owing to the lack of adequate buffers. If the measure repeatedly reports low values, it could be indicative of a memory bottleneck on the router. |