Web Dispatcher Performance Problem

Question

Hi,
We are using the Web Dispatcher with the Enterprise Portal 6.0
installed on Solaris 9 with Oracle 10g.
When we are trying to access the Portal via the web dispatcher we are
seeing that the loading of the initial page is long time as compared to
when we are using the direct portal link to access the same.
The difference in accessing the iniital page using the web dispatcher
url is nearly 3 times as compared to accessing the same by the direct
portal url.
We have installed 2 application servers with 4 java server nodes in one
application server and 2 java server nodes in one application server.
Please find the web dispatcher profile parameters enclosed herewith
<b>Parameters set in web dispatcher profile</b>
sp1adm> pg SP1_SCS85_sapwebdisp
SUN Cluster | SAP Web Dispatcher
SAPSYSTEMNAME = SP1
SAPSYSTEM = 95
DIR_INSTANCE = /usr/sap/SP1/SYS/sapwebdisp
SECUDIR = /usr/sap/SP1/SYS/sapwebdisp/sec
rdisp/mshost = sapsp1ms-db
ms/http_port = 8185
wdisp/auto_refresh = 60
wdisp/max_servers = 100
wdisp/permission_table = /usr/sap/SP1/SYS/sapwebdisp/sapwebdisp.tab
wdisp/HTTP/context_timeout = 3600
wdisp/HTTP/jsessionid_tab_support = 1
is/HTTP/show_detailed_errors = FALSE
icm/host_name_full = sapsp1ms.in.telstra.com.au
icm/server_port_0 = PROT=HTTP,PORT=80,HOST=sapsp1ms.in.telstra.com.au,EXTBIND=1
icm/server_port_1 = PROT=HTTP,PORT=50100,HOST=sapsp1ms.in.telstra.com.au
icm/server_port_2 = PROT=HTTPS,PORT=443,HOST=sapsp1ms.in.telstra.com.au,EXTBIND=1
icm/HTTP/server_cache_0 = PREFIX=/, CACHEDIR=/usr/sap/SP1/SYS/sapwebdisp/data/cache0
icm/HTTP/admin_0 = PREFIX=/sap/wdisp/admin, DOCROOT=/usr/sap/SP1/SYS/sapwebdisp/admin, AUTHFILE=/usr/sap/SP1/SYS/sapwebdisp/icmauth.txt
icm/HTTP/file_access_0 = PREFIX=/sap/public/icman, DOCROOT=/usr/sap/SP1/SYS/sapwebdisp/public/icman
SAP Web Dispatcher Web Administration
icm/HTTP/redirect_0 = PREFIX=/, TO=/irj/index.html
icm/HTTPS/verify_client = 1
ssl/ssl_lib = /usr/sap/SP1/SYS/exe/run/libsapcrypto.so
ssl/server_pse = /usr/sap/SP1/SYS/sapwebdisp/sec/SAPSSLS.pse
ssl/client_pse = /usr/sap/SP1/SYS/sapwebdisp/sec/SAPSSLC.pse
wdisp/ssl_encrypt = 0
wdisp/ssl_auth = 2
wdisp/ssl_host = sapsp1ms.in.telstra.com.au
icm/keep_alive_timeout = 1800
icm/conn_timeout = 180000
SUPPORTING LARGE USER BASE PARAMETERS
icm/max_conn = 8192
icm/max_sockets = 16384
wdisp/HTTP/max_pooled_con = 8192
wdisp/HTTPS/max_pooled_con = 8192
icm/req_queue_len = 6000
icm/min_threads = 100
icm/max_threads = 200
mpi/total_size_MB = 500
mpi/buffer_size = 65536
mpi/max_pipes = 21000
Please check and let us know as to how do we improve the performance of
the same.
Thanks & Regards,
Srinivas Reddy

Answer 1

Jochen,
Thanks for the reply.  Here is the "graphical" flow;
IE==>HW-LB==> 3 (Apache==>Reverse Proxy-->WebDisp) --> 2 (WAS 6.40 SP11 PL3)
(Legend ==> HTTPS  --> HTTP)
At the risk of redundancy, there are 3 Linux SLES8 servers running Apache2 with Reverse Proxy, and the Web Dispatcher 6.40 PL90.  Each of these servers are/should be distributing load to 2 WAS 6.40 SP11 PL3 Java-only servers running Windows 2003.   
My assumption is that reverse proxy is sending HTTP to the dispatcher then on to WAS or at least pass thru.  Should I setup a HTTPS terminate at the dispatcher?
Here's the sapwebdisp.pfl;
Profile generated by sapwebdisp bootstrap
unique instance number
SAPSYSTEM = 01
Accesssability of Message Servers
rdisp/mshost = msgserver.reinternal.com
ms/http_port = 8101
SAP Web Dispatcher Parameter
wdisp/auto_refresh = 120
wdisp/max_servers = 100
#maximum number of concurrent connections to one server
wdisp/HTTP/max_pooled_con = 8000
wdisp/HTTPS/max_pooled_con = 8000
SAP Web Dispatcher Ports
icm/server_port_0 = PROT=HTTP,PORT=8080
SAP Web Dispatcher Web Administration
icm/HTTP/admin_0 = PREFIX=/sap/wdisp/admin,DOCROOT=./admin, PORT=8080
icm/max_conn     = 8192
icm/max_sockets = 16384
icm/min_threads = 100
icm/max_threads = 250
icm/req_queue_len = 6000
icm/conn_timeout = 90000
icm/keep_alive_timeout = 90
mpi/total_size_MB = 350
mpi/max_pipes = 13500
mpi/buffer_size = 32768
Any advice or suggested course of action would be appreciated.
Thanks,
Dan