Memory issues on Production system

Hello,
We are facing memory dumps and slow SAP performance on our PRODUCTION ECC EHP4 system.
Many work process also goes to PRIV mode frequently
But we have very good response Time also.
I checked ST06 and see,
CPU Idle % = 40%
IO wait % = 16%
CPU count = 8
Number of request waiting to get processed in
1 Min = 7
5 Min = 6
15 Min = 6
We have Physical memory = 50GB
Free Memory only = 300 MB
We have following parameter set in RZ10
em/initial_size_MB = 4 GB
ztta/roll_extension = 2 GB
abap/heap_area_dia = 5GB
abap/heap_area_nondia = 5GB
abap/heap_area_total = 10 GB
rdisp/wp_no_dia 20
rdisp/wp_no_btc 8
Please guide
Regards,

Hello,
OS : Linux x86_64
I see following under info queue
Process Type
Requests waiting
Max. No. of Requests Wait.
Maximum number of requests
Requests written
Number of requests read
NOWP
0
21
2000
2220880
2220880
DIA
0
29
2000
1022368
1022368
UPD
0
3
2000
306
306
ENQ
0
1
2000
1
1
BTC
0
3
2000
121633
121633
SPO
0
1
2000
56826
56826
UP2
0
1
2000
151
151
Do I need to increase the em/initial_size_mb to 16 Gb
And DO I need to decrease the some DIA and BGD work processes to free some memory?
Regards,
Jigar

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