Check out the info apars and (very carefully!) check out segmentation offload. You might want to bounce this off of IBM (either WLM or Comm. Server ).
That's about all I can recommend. Please post the results when/if there are any. I would be interested in the responses from IBM. -----Original Message----- From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of Werner Kuehnel Sent: Friday, January 29, 2010 8:03 AM To: IBM-MAIN@bama.ua.edu Subject: Antwort: Re: WLM and TCPIP Tried already to shift TCPIP into SYSTEM, but is not allowed. WLM can not starve STCs defined in SYSSTC. Why does WLM not cut the processor for the batch jobs which are defined DISCRETIONARY? Werner Kuehnel IBM Mainframe Discussion List <IBM-MAIN@bama.ua.edu> schrieb am 29.01.2010 14:49:44: > Given the situation I would say, probably, NO. You *might* be able to > move TCPIP to SYSTEM but ISTR some changes made a few releases back to > force certain system critical tasks into IBM assigned SCLASSes. > > The problem is not the TCPIP is not high enough on the food chain, but > that the food chain has been shortened when the soft cap kicks in. This > is the most likely causes of CPU delay. > > Possible Performance improvements for TCPIP > Segmentation Offload. Not sure of the current status. A long history of > trys, retrys, and try agains. Check the archives. > There are a couple of TCPIP performance Inoforamation APARS the also > might help II11710, II11711, II11712. None of these "address" CPU > directly, but the net effect will be to reduce the CPU overhead per byte > when implemented. > > HTH, > > <snip> > Our box is running at 90-100% under soft capping. > TCPIP is defined with service class SYSSTC. > When capping starts the PING response times explode from approx. 15ms to > > 400 - 1000ms. Looking with RMF3 delay monitor at TCPIP, it shows a delay > > up to 70% because of processor. > SYSSTC is the highest service class I can assign, it runs with > dispatching > prio of FE. Nevertheless TCPIP is delayed at such a high degree. > Is there anything I can do to improve the performance of TCPIP? > </snip> > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
