Hello Pramod,
there are requirements for the memory installed on the linecards themselves not only the memory installed on the PRP counts.
We have installed GSR XR and a memory upgrade is needed on the linecard.
first of all PRP1 is not suppored in IOS XR 3.8
see
http://www.cisco.com/en/US/partner/docs/ios_xr_sw/iosxr_r3.8/migration/user/guide/up38upinst.html#wp1096775
or
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/migration/user/guide/up38upinst.html#wp1096775
>>
Cisco supports the deployment of Cisco IOS XR software on the following route processors (RPs) installed in a Cisco XR 12000 Series Router:
•PRP2
•PRP3
and for linecards
Minimum Line Card Memory Requirement
To operate properly, Cisco IOS XR software requires that a line card have a minimum of 1 GB of memory.
Because not all Engine-5 and Engine-3 line cards are configured with this amount of memory, you must manually confirm the memory level of the line cards against the current minimum memory requirement before migration.
see
Probably memory requirements have been increased in IOS XR 3.8 in comparison with IOS XR 3.6
this can be a possible explanation of your issues
Hope to help
Giuseppe
