Page cache in Kafka

We are receiving alerts for kafka memory utilization in our kubernetes cluster and analysing it seems that most of the memory is page cache. I am aware that kafka uses loads of page cache for IO performance and reads/writes are cached before flushing to disk.i am trying to see ways to fine tune this page cache and lot of articles direct to update vm.dirty_ratio and vm.dirty_background_ratio kernel parameters for earlier flushing of data to the disk from memory.

When i checked i see that the Dirty cache already seems to be low and these parameters need not be updated.

cat /proc/meminfo|grep Dirty Dirty: 70416 kB

cat /proc/vmstat | egrep "dirty|writeback" nr_dirty 24873 nr_writeback 0 nr_writeback_temp 0 nr_dirty_threshold 34518467 nr_dirty_background_threshold 11506155

Any ideas on what else can be done to fine tune page caches?