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Wait time in ST03 of dialog work processes increase significantly and intermittently

Hi experts,

  I run our 19 application servers with configuration like below for about 5 months without any problems(CPU utilization is always below 20%).I find wait time in ST03 of dialog work processes increases significantly and intermittently recently. I check dev_disp and find error messages like this. I plan to increase dialog work processes from 20 to 30(according to the note 39412) and update kernel 721_EXT from 136 to 316 and hope this works. Any opinions?

PS: By the way, rdisp/queue_size_check_value use default value =  on,50,30,40,500,50,500,80

--- dev_disp ---

Fri Sep 12 16:24:51 2014

DpHdlDeadWp: W25 (pid=11012) terminated automatically

Fri Sep 12 16:42:55 2014

DIA water mark reached (>30)

Fri Sep 12 16:43:16 2014

DIA water mark underrun (<=30)

Fri Sep 12 16:43:27 2014

DIA water mark reached (>30)

Fri Sep 12 16:43:59 2014

DIA water mark underrun (<=30)

Fri Sep 12 16:44:12 2014

DpRTmPrepareReq: network error of client T123, NiBufReceive (-6: NIECONN_BROKEN), dp_tm_status=3

DpRTmPrepareReq: client address of T123 is 172.20.166.133(172.20.166.133)

***LOG Q04=> DpRTmPrep, NiBufReceive (1326703020559 123 SAP15C ) [dpxxdisp.c   12341]

RM-T123, U13267, 218     03020559, SAP15C, 16:43:59, M0, W11,     , 2/0

Fri Sep 12 16:44:15 2014

DpRTmPrepareReq: network error of client T45, NiBufReceive (-6: NIECONN_BROKEN), dp_tm_status=3

DpRTmPrepareReq: client address of T45 is 172.20.166.133(172.20.166.133)

***LOG Q04=> DpRTmPrep, NiBufReceive (1334107101497 45 SAP15C ) [dpxxdisp.c   12341]

RM-T45, U13341, 218     07101497, SAP15C, 16:44:03, M0, W11, SESS, 2/0

HardCancel request for T45 U13341 M0 received from DISPATCHER

Fri Sep 12 16:44:17 2014

DpRTmPrepareReq: network error of client T161, NiBufReceive (-6: NIECONN_BROKEN), dp_tm_status=3

DpRTmPrepareReq: client address of T161 is 172.20.166.133(172.20.166.133)

***LOG Q04=> DpRTmPrep, NiBufReceive (13350 161 SAP15C ) [dpxxdisp.c   12341]

RM-T161, U13350, 000             , SAP15C, 16:43:59, M0, W17, SESS, 2/0

--- profile ---

rdisp/wp_no_dia = 20

rdisp/wp_no_btc = 13

rdisp/wp_no_enq = 0

rdisp/wp_no_spo = 2

rdisp/wp_no_vb = 5

rdisp/wp_no_vb2 = 2

--- ST03 screenshot ---

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