Novell can't even find the ticket # I gave you that we filed this under?
Tom Shilson <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> To LINUX-390@VM.MARIST.EDU cc 12/15/2006 02:24 PM Subject Re: Hipersocket Performance Problem on SLES 9 Please respond to Linux on 390 Port <LINUX-390@VM.MARIST.EDU> We can't find this patch, or any mention of it, anywhere. I have opened an incident with SuSE and will post the results here. tom - - - - - - - - - - - - Toto, I have a feeling we're not in the mainframe world any more. _/) Tom Shilson ~~~~~ Unix Team / IT Server Services Aloha Tel: 651-733-7591 tshilson at mmm dot com Fax: 651-736-7689 James Melin <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> 12/14/2006 08:53 AM Please respond to Linux on 390 Port <LINUX-390@VM.MARIST.EDU> To LINUX-390@VM.MARIST.EDU cc Subject Re: Hipersocket Performance Problem on SLES 9 Mark, I saw something similar when we first went to SLES-9 (64 bit). We had MTU sizes being negotiated down to an idiotic packet size of 1492. Whether or not this has to do with how our OSA is configured I never did learn. Search for stuff with hipersockets and MTU in the archives for the particulars. We reported it to Novell. They eventually managed to test on SLES 9 under z/Series and eventually issued a patch. They sent us this file: iputils-ss021109-147.2.PTF.184411.0.s390.rpm I don't know whether or not this file is GA but it touched MANY IP related items, indicating that the problem was pervasive. Once we applied it our MTU negotiation problem went away. It may or may not have bearing on your situation, but I offer the information to any and all that might find it relevant. -J Mark Wheeler <[EMAIL PROTECTED]> Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU> To LINUX-390@VM.MARIST.EDU cc 12/14/2006 08:33 AM Subject Hipersocket Performance Problem on SLES 9 Please respond to Linux on 390 Port <LINUX-390@VM.MARIST.EDU> Greetings all, I've been using real hipersockets for a couple years now. Recently a significant performance problem with SLES 9 and large MTU sizes was brought to my attention. I've been using MTU=32760. I set up a test to illustrate the problem. I built a 256 MB file on one zLinux guest (running under z/VM 5.2 on a z9-109), with enough storage defined so the file could be completely cached. I then FTP'd it to /dev/null on another server over a hipersocket connection. Here's what I observed: SLES8-to-SLES8, MTU=8184, ~75 MB/sec SLES8-to-SLES8, MTU=32760, ~100 MB/sec (as high as 132 MB/sec) SLES8-to-SLES9, MTU=32760, ~100 MB/sec z/VM-to-SLES9, MTU=32760, ~100 MB/sec (from file on VDISK to /dev/null) z/OS-to-SLES9, MTU=32760, ~25 MB/sec (from disk cache on z/OS) SLES9-to-SLES9, MTU=8184, ~75 MB/sec SLES9-to-SLES9, MTU=32760, ~400 KB/sec (not MegaBytes, KiloBytes!) Has anyone else seen this? I use 32760 on my hipersocket links so as to be consistent with the 32760 MTU size used on CTC links to other processors owned by my z/VM TCPIP machine, which is used as the gateway between Linux guests on one machine and z/OS on the other machines. Best regards, Mark Wheeler, 3M Company ---------------------------------------------------------------------- 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 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 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 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