I/O mempool drops to 20 percent after upgrade to 12.2.50 or version 15 on 3750X

[rallie]

The free  i/o mempool dropped  to 20 percent from 40 after upgrading from 12.2-55.to version 12.2.58 or version 15.0. This did not create any issues on the switch, but our Spectrum NMS report high mempool utilization issues. When we downgraded the i/o mempool indicated 40 percent again

Is this a problem with the  IOS version?  

[Giuseppe Larosa]

Hello Rallie,

I would compare the I/O total memory size as taken from show proc mem with old and new image, the new image can have assigned less memory to I/O and as a result of this the percentage of free memory is less.

IF the total I/O memory size is the same it would mean that newer IOS uses double of memory for the same set of interfaces.

Hope to help

Giuseppe