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MA45524 - OSP-COMM-ELAN-PERFM DEVICE DRIVER NOT RECEIVING INTERRUPTS

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 APAR (Authorized Program Analysis Report)

Abstract

OSP-COMM-ELAN-PERFM DEVICE DRIVER NOT RECEIVING INTERRUPTS

Error Description

SRIOV capable cards 26E4 has problem with not receiving packets
in a timely manner.                                            
                                                               
The problem with a delay 1/16th (0.0625) of a seconds occurs    
when a line description is ONLINE(*YES) or an associated        
interface is AUTOSTART(*YES). A Sniffer network trace will see  
a delay in the .064 or .065 of a second for response.          

Problem Summary

****************************************************************
* PROBLEM: (MA45524) Licensed Program = 5770999 for i 7.1,     *
*                                        i 7.2, and i 7.3      *
*           Severe Performance Degradation                     *
*            Severe performance degradation of the Ethernet    *
*            adapter.                                          *
****************************************************************
* USERS AFFECTED: All IBM i operating system users with        *
*                  Ethernet adapters with CCINs 2B93, 2C4C,    *
*                  2C4D, 2CC0, 2CC1, 2CE3, or 2CE4.            *
****************************************************************
* RECOMMENDATION: Apply LIC PTF MF61852 for i 7.1.             *
*                 Apply LIC PTF MF61863 for i 7.2.             *
*                 Apply LIC PTF MF61864 for i 7.3.             *
****************************************************************
*****                                                          
There is a problem with Ethernet device drivers not receiving  
packets in a timely manner.  The customer was seeing a delay of
approximately .065 of a second for a response with a sniffer    
network trace with a ping test.  This behavior can be observed  
with adapters with CCINs 2B93, 2C4C, 2C4D, 2CC0, 2CC1, 2CE3, or
2CE4.  Varying the line description off and on corrected the    
performance issue.                                              

Problem Conclusion

The symptoms seen by the customer are due to the device driver  
not receiving interrupts.  This is caused by a multi-threading  
issue which is seen if multiple CMN resources on a device are  
being activated simultaneously.  This is more likely to happen  
if the CMN resources have line descriptions with ONLINE(*YES)  
specified or if those line descriptions are associated with    
interfaces with AUTOSTART(*YES).                                
                                                               
This PTF will fix the multi-threading problem with interrupt    
setup and the device driver performance issue should be        
corrected.                                                      
                                                               
Additional keywords:                                            
 65 ms  milliseconds                                            
 inbound                                                        

Temporary Fix

                       *********                                
                       * HIPER *                                
                       *********                                

Comments

Circumvention


PTFs Available

R710 MF61852 PTF Cover Letter   6320
R720 MF61863 PTF Cover Letter   6306
R730 MF61864 PTF Cover Letter   6299

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG300
Failing Module.......................... RCHMGR
Reported Release................... R710
Duplicate Of..............................




System i Support

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Document Information

Modified date:
02 December 2016