Many PXA_NO_FREE_SPACE dumps & huge swapping

Dear Team,

We are receiving many PXA_NO_FREE_SPACE in our production system.After a restart, it works fine.Then swaps increase day by day till it reaches 11,770,310 and then dumps occur.

RAM is 49GB

Linux x86 , Kernel 720 Ext(401)

SAP BASIS is 701

abap/buffersize=400 MB

rdisp/bufrefmode = sendon

Current parameter settings:

We have analyzed and found to change the below parameters :

abap/buffersize - 700 MB

abap/buffer_fragments - 1 (new)

rdisp/bufrefmode - sendon,exeauto

Please guide me if other parameters (ipc/shm_psize_nn)for other buffers also need to be modified or the above parameters are sufficient to avoid frequent dumps.

FYI - Recently, we had upgraded our kernel after which the dumps started occurring. The parameter rdisp/bufrefmode, ipc/shm_psize_nn was changed after upgrade.

Regards

Imaan