A fix is available
APAR status
Closed as program error.
Error description
************************************************************** * USERS AFFECTED: * Systems running the AIX 7200-04-02-2015 or * 7200-04-02-2016 Technology Level or * VIOS 3.1.1.20 or 3.1.1.21 with * devices.vdevice.IBM.l-lan.rte below the * 7.2.4.3 level. ************************************************************** * ERROR DESCRIPTION: * The Virtual Ethernet Adapter can cause a significant * degradation in TCP performance for largesend packets. * * This issue can be seen with VIOS (serving any AIX, IBMi, or * Linux client LPAR) running the affected VIOS levels below. * It can also be seen with any AIX client LPAR running the * affected AIX levels below (regardless of the VIOS level). * This issue only occurs when the client LPARS are configured * for largesend traffic or VIOS is configured for largereceive * traffic. ************************************************************** * RECOMMENDATION: * Install APAR IJ25390. * Prior to fix availability, an interim fix is available from * either * ftp://aix.software.ibm.com/aix/ifixes/ij25390/ * https://aix.software.ibm.com/aix/ifixes/ij25390/ * The ifix can be installed using Live Update (LU). * If LU is not used, installation of the ifix requires a * reboot. **************************************************************
Local fix
Disable PLSO: Either disable mtu_bypass: # chdev -l enX -a mtu_bypass=off or disable PLSO on the VEA or trunk VEA: # chdev -l entX -a platform_lso=no
Problem summary
Customer may experience very slow TCP performance when Platform Large Send is enabled on the network interface and the traffic is VLAN tagged.
Problem conclusion
Fix ethernet header length calculation for VLAN tagged case.
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
IJ25390
Reported component name
AIX V7.2
Reported component ID
5765CD200
Reported release
720
Status
CLOSED PER
PE
YesPE
HIPER
YesHIPER
Submitted date
2020-06-04
Closed date
2020-06-04
Last modified date
2020-11-16
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.2
Fixed component ID
5765CD200
Applicable component levels
R720 PSY U885349
UP20/07/10 I 1000
PTF to Fileset Mapping
U885349 devices.vdevice.IBM.l-lan.rte 7.2.4.3
[{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSVEF8","label":"AIX 7.2 Enterprise Edition"},"Platform":[{"code":"PF053","label":"Power Systems"}],"Version":"720","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
18 November 2020