Strange response time for an RFC call viewed from STAD on R/3 4.7

Hello,
On our R/3 4.7 production system, we have a lot of external RFC calls to execute an  abap module function. There are 70 000 of these calls per day.
The mean response time for this RFC call is 35 ms.
Some times a few of them (maybe 10 to 20 per day) are way much longer.
I am currently analysing with STAD one of these long calls  which lasted 10 seconds !
Here is the info from STAD
Response time :                10 683 ms
Total time in workprocess : 10 683 ms
CPU time  :                               0 ms
RFC+CPIC time :                       0 ms
Wait for work process           0 ms
Processing time           10.679 ms
Load time                            1 ms
Generating time                   0 ms
Roll (in) time                        0 ms
Database request time         3 ms
Enqueue time                      0 ms
Number      Roll ins            0
                 Roll outs           0
                 Enqueues         0
Load time   Program             1  ms
                  Screen              0  ms
                 CUA interf.          0  ms
Roll time    Out                 0  ms
                  In                  0  ms
                Wait                0  ms
Frontend    No.roundtrips       0   
                  GUI time            0  ms
                  Net time            0  ms
There is nearly no abap processing in the function module.
I really don't uderstand what is this  10 679 ms processing time especially with 0 ms cpu time and 0 ms wait time.
A usual fast RFC call gives this data
23 ms response time
16 ms cpu time
14 ms processing time
1 ms load time
8 ms Database request time
Does anybody have an idea of what is the system doing during the 10 seconds  processing time ?
Regards,
Olivier

Hi Graham,
Thank you for your input and thoughts.
I will have to investigate on RZ23N and RZ21 because I'm not used to use them.
I'm used to investigate performance problems with ST03 and STAD.
My system is R/3 4.7 WAS 6.20. ABAP and BASIS 43
Kernel 6.40 patch level 109
We know these are old patch levels but we are not allowed to stop this system for upgrade "if it's not broken" as it is used 7/7 24/24.
I'm nearlly sure that the problem is not an RFC issue because I've found other slow dialog steps for web service calls and even for a SAPSYS technical dialog step  of type <no buffer>. (what is this ?)
This SAPSYS dialog step has the following data :
User : SAPSYS
Task type : B
Program : <no buffer>
CPU time                       0 ms
RFC+CPIC time              0 ms
Total time in workprocs    5.490 ms
Response time               5.490 ms
Wait for work process           0 ms
Processing time             5.489 ms
Load time                            0 ms
Generating time                   0 ms
Roll (in+wait) time                0 ms
Database request time          1 ms ( 3 Database requests)
Enqueue time                       0 ms
All hundreds of other SAPSYS <no buffer> steps have a less than 5 ms response time.
It looks like the system was frozen during 5 seconds...
Here are some extracts from STAD of another case from last saturday.
11:00:03     bt1fsaplpr02_PLG RFC     R     3     USER_LECKIT     13     13     0     0
11:00:03     bt1sqkvf_PLG_18      RFC     R     4     USER_LECDIS     13     13     0     0
11:00:04     bt1sqkvh_PLG_18      RFC     R     0     USER_LECKIT     19     19     0     16
11:00:04     bt1sqkvf_PLG_18      RFC     R     4     USER_LECKIT     77     77     0     16
11:00:04     bt1sqkve_PLG_18      RFC     R     4     USER_LECDIS     13     13     0     0
11:00:04     bt1sqkvf_PLG_18      RFC     R     4     USER_LECDIS     14     14     0     16
11:00:05     bt1sqkvg_PLG_18      RFC     R     0     USER_LECKIT     12     12     0     16
11:00:05     bt1sqkve_PLG_18      RFC     R     4     USER_LECKIT     53     53     0     0
11:00:06     bt1sqkvh_PLG_18      RFC     R     0     USER_LECKIT     76     76     0     0
11:00:06     bt1sqk2t_PLG_18      RFC     R     0     USER_LECDIS     20     20     0     31
11:00:06     bt1sqk2t_PLG_18      RFC     R     0     USER_LECKIT     12     12     0     0
11:00:06     bt1sqkve_PLG_18      RFC     R     4     USER_LECKIT     13     13     0     0
11:00:06     bt1sqkvf_PLG_18      RFC     R     4     USER_LECKIT     34     34     0     16
11:00:07     bt1sqkvh_PLG_18      RFC     R     0     USER_LECDIS     15     15     0     0
11:00:07     bt1sqkvg_PLG_18      RFC     R     0     USER_LECKIT     13     13     0     16
11:00:07     bt1sqk2t_PLG_18      RFC     R     0     USER_LECKIT     19     19     0     0
11:00:07     bt1fsaplpr02_PLG RFC     R     3     USER_LECKIT     23     13     10     0
11:00:07     bt1sqkve_PLG_18      RFC     R     4     USER_LECDIS     38     38     0     0
11:00:08     bt1sqkvf_PLG_18      RFC     R     4     USER_LECKIT     20     20     0     16
11:00:09     bt1sqkvg_PLG_18      RFC     R     0     USER_LECDIS     9 495     9 495     0     16
11:00:09     bt1sqk2t_PLG_18      RFC     R     0     USER_LECDIS     9 404     9 404     0     0
11:00:09     bt1sqkvh_PLG_18      RFC     R     1     USER_LECKIT     9 181     9 181     0     0
11:00:10     bt1fsaplpr02_PLG RFC     R     3     USER_LECDIS     23     23     0     0
11:00:10     bt1sqkve_PLG_18      RFC     R     4     USER_LECKIT     8 465     8 465     0     16
11:00:18     bt1sqkvh_PLG_18      RFC     R     0     USER_LECKIT     18     18     0     16
11:00:18     bt1sqkvg_PLG_18      RFC     R     0     USER_LECKIT     89     89     0     0
11:00:18     bt1sqk2t_PLG_18      RFC     R     0     USER_LECKIT     75     75     0     0
11:00:18     bt1sqkvh_PLG_18      RFC     R     1     USER_LECDIS     43     43     0     0
11:00:18     bt1sqk2t_PLG_18      RFC     R     1     USER_LECDIS     32     32     0     16
11:00:18     bt1sqkvg_PLG_18      RFC     R     1     USER_LECDIS     15     15     0     16
11:00:18     bt1sqkve_PLG_18      RFC     R     4     USER_LECDIS     13     13     0     0
11:00:18     bt1sqkve_PLG_18      RFC     R     4     USER_LECDIS     14     14     0     0
11:00:18     bt1sqkvf_PLG_18      RFC     R     4     USER_LECKIT     69     69     0     16
11:00:18     bt1sqkvf_PLG_18     RFC     R     5     USER_LECDIS     49     49     0     16
11:00:18     bt1sqkve_PLG_18     RFC     R     5     USER_LECKIT     19     19     0     16
11:00:18     bt1sqkvf_PLG_18     RFC     R     5     USER_LECDIS     15     15     0     16
The load at that time was very light with only a few jobs starting :
11:00:08 bt1fsaplpr02_PLG RSCONN01                     B 31 USER_BATCH     39
11:00:08 bt1fsaplpr02_PLG RSBTCRTE                     B 31 USER_BATCH     34
11:00:08 bt1fsaplpr02_PLG /SDF/RSORAVSH                B 33 USER_BATCH     64
11:00:08 bt1fsaplpr02_PLG RSBTCRTE                     B 33 USER_BATCH     43
11:00:08 bt1fsaplpr02_PLG RSBTCRTE                     B 34 USER_BATCH     34
11:00:08 bt1fsaplpr02_PLG RSBTCRTE                     B 35 USER_BATCH     37
11:00:09 bt1fsaplpr02_PLG RVV50R10C                    B 34 USER_BATCH     60
11:00:09 bt1fsaplpr02_PLG ZLM_HDS_IS_PURGE_RESERVATION B 35 USER_BATCH    206
I'm thinking also now about the message server as there is load balancing for each RFC call ?
Regards,
Olivier

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    #127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    #::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    127.0.0.1               localhost.localdomain localhost
    ::1            localhost6.localdomain6 localhost6
    # Public Network – (eth0)
    192.168.1.3     rac1.sathy.net    rac1
    192.168.1.5     rac2.sathy.net    rac2
    # Public Virtual IP (VIP) addresses – (eth0:1)
    192.168.1.4     rac1-vip.sathy.net rac1-vip
    192.168.1.6     rac2-vip.sathy.net rac2-vip
    # Private Interconnect – (eth1)
    192.168.2.3      rac1-priv.sathy.net       rac1-priv
    192.168.2.5      rac2-priv.sathy.net       rac2-priv
    #Compute Node Client Access SCAN Interface details
    #192.168.1.7   sathy-scan.sathy.net  sathy-scan
    #192.168.1.8   sathy-scan.sathy.net  sathy-scan
    #192.168.1.9   sathy-scan.sathy.net  sathy-scan
    [root@mydns ~]#
    [root@rac1 ~]# cat /etc/hosts
    #127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    #::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    127.0.0.1               localhost.localdomain localhost
    ::1            localhost6.localdomain6 localhost6
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    192.168.1.3     rac1.sathy.net    rac1
    192.168.1.5     rac2.sathy.net    rac2
    # Public Virtual IP (VIP) addresses – (eth0:1)
    192.168.1.4     rac1-vip.sathy.net rac1-vip
    192.168.1.6     rac2-vip.sathy.net rac2-vip
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    192.168.2.3      rac1-priv.sathy.net       rac1-priv
    192.168.2.5      rac2-priv.sathy.net       rac2-priv
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    #192.168.1.7   sathy-scan.sathy.net  sathy-scan
    #192.168.1.8   sathy-scan.sathy.net  sathy-scan
    #192.168.1.9   sathy-scan.sathy.net  sathy-scan
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    #127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    #::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    127.0.0.1               localhost.localdomain localhost
    ::1            localhost6.localdomain6 localhost6
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    192.168.1.3     rac1.sathy.net    rac1
    192.168.1.5     rac2.sathy.net    rac2
    # Public Virtual IP (VIP) addresses – (eth0:1)
    192.168.1.4     rac1-vip.sathy.net rac1-vip
    192.168.1.6     rac2-vip.sathy.net rac2-vip
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    192.168.2.3      rac1-priv.sathy.net       rac1-priv
    192.168.2.5      rac2-priv.sathy.net       rac2-priv
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    #192.168.1.8   sathy-scan.sathy.net  sathy-scan
    #192.168.1.9   sathy-scan.sathy.net  sathy-scan
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    Sun Sep  9 22:04:45 IST 2012
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    Sun Sep  9 22:04:54 IST 2012
    [grid@rac1 ~]$
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    Sun Sep  9 22:04:18 IST 2012
    [oracle@rac2 ~]$ su - grid
    Password:
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    Sun Sep  9 22:04:31 IST 2012
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    PRVF-5637 : DNS response time could not be checked on following nodes: rac2,rac1what else?
    i wonder how it was successful in my previous installation which in oel 5.7....
    Edited by: OraDB on Sep 9, 2012 9:44 AM

  • PRVF-5636 : The DNS response time for an unreachable node exceeded "15000" ms on following nodes

    HI
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    As this chain of comments has previously indicated, you are best off using STAD if you want an accurate indication of response time. The ST12 (combines SE30 ABAP trace and ST05 SQL trace) trace times are less accurate that the values you get from ST12. I am not discounting the value of ST12 by any means. This is a very powerful tool to help you tune your transactions.
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    Kind regards,
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    SAP Active Global Support

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