[LU-8248] sanity test_248: fast read was not 4 times faster

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.9.0
• Severity: 3
• Assignee: James Nunez (Inactive)
• Reporter: Maloo

Description

This issue was created by maloo for Andreas Dilger <[e-mail]>

This issue relates to the following test suite run: https://testing.hpdd.intel.com/test_sets/28287b5e-2b40-11e6-acf3-5254006e85c2.

The sub-test test_248 failed with the following error:

Test 1: verify that fast read is 4 times faster on cache read
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.33 vs 1.15): 
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.29 vs 1.08):  
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.32 vs 1.08):  
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.26 vs 1.02):  
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.59 vs 0.98):  
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.28 vs 0.89): 
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.37 vs 1.30): 
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.39 vs 0.97): 
 sanity test_248: @@@@@@ IGNORE (fast read was not 4 times faster: 0.41 vs 1.45): 

There are also cases where the fast read was "too fast". There is also an error message that needs to be fixed.

error() without useful message, please fix

Info required for matching: sanity 248

Issue Links

• is related to: LU-4257 parallel dds are slower than serial dds