zLinux assigns the MTU size according to the IQD CHPID definition. For sake of discussion lets say I set the CHPID to a Max Frame Size of 64K, that would give me an MTU size of 56K according to the Doc.
Where can I control the size of the packets I'll send across the interface? In the Tape Blocksize / Record length as alluded to in the Adam's previous note? Sorry for all the questions... But I've got to learn this stuff somewhere. David Rakoczy -----Original Message----- From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of David Boyes Sent: Thursday, January 15, 2009 10:07 AM To: LINUX-390@VM.MARIST.EDU Subject: Re: HiperSocket Performance For bulk data transfer, make the MTU size as large as possible, and make your packet sizes at least 40 bytes smaller than the maximum MTU to avoid fragmentation of data packets. That allows space for the TCP header on each packet. Note that this will affect interactive response, so it's probably not a good idea to try to share the same connection for interactive access and bulk transfer like backups. ---------------------------------------------------------------------- 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 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
