On Thursday, 02/09/2012 at 09:45 EST, "Herczeg, Zoltan" <zol...@krasdalefoods.com> wrote: > DEFINE LINK,ID=HIPER-B04,TYPE=OSAX,DEV=B04,DATAPATH=B0F,MTU=8192, - > PORTNAME=HIPER-B04,FRAGMENT=NO,IPADDR=9.52.1.24
If you want to use MTU of 8192, Make sure the CHPARM for the HiperSocket chpid is set to 16K since (MTU = MFS-8192). If you want to use jumbo frames, you'll need CHPARM of 24K. If you want Really Huge Frame, run the CHPARM up to 64K and use a 56K MTU. Large MTUs are good for batch streaming. But remember that HiperSockets uses the z CPUs. If you are CPU-bound, adding HiperSockets will make things worse. In that case, consider using a shared OSA port with jumbo frames. Alan Altmark Senior Managing z/VM and Linux Consultant IBM System Lab Services and Training ibm.com/systems/services/labservices office: 607.429.3323 mobile; 607.321.7556 alan_altm...@us.ibm.com IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
