On Thursday, 11/10/2011 at 07:54 EST, "Martin, Terry R. (CMS/CTR) (CTR)" <[email protected]> wrote: > Thanks. After researching I found that the default MTU size on the 10G OSA is > 8992. So trying at 9000 or anything higher than the 8992 on z/Linux is a moot > point. > > Thanks again for the information. > > Btw, there was nothing that I had to do from the z/VM standpoint or TCP/IP on > z/VM. The TCP/IP stack on the z/Linux guest is where the MTU size was set for > this. The main thing in our case was that the Jumbo Frame support on our CISCO > switch was not enabled once that was enabled we were able to start transferring > Jumbo Frames.
The limit of 8992 is because the OSAs support 802.2/802.3x-conformant ethernet frames. (The 8992 value is documented in the OSA-Express Customer's Guide and Reference.) 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 [email protected] IBM Endicott ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [email protected] 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/
