[LU-11105] Seeing "Using FastReg with no GAPS support" that can't be resolved

Duplicate — Wed, 8 Aug 2018 20:32:18 +0000

I found that I was unable to read the ones that were 5K in size. This occurs on the f2-util01 host that has a 2.11 client. It spews errors and eventually times out. To test if it was a 2.7 client <-> 2.11 client issue, I created another 5K text file from f2-util01. I found that I was unable to read that one as well. Identify what the issue was and pointed out that it was showing this in the logs:

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LNetError: 106211:0:(o2iblnd_cb.c:571:kiblnd_fmr_map_tx()) Using FastReg with no GAPS support, but tx has gaps. Try setting use_fastreg_gaps to 1

LNetError: 106211:0:(o2iblnd_cb.c:571:kiblnd_fmr_map_tx()) Skipped 477 previous similar messages

LNetError: 106211:0:(o2iblnd_cb.c:1884:kiblnd_recv()) Can't setup PUT sink for 10.10.33.32@o2ib2: -93

LNetError: 106211:0:(o2iblnd_cb.c:1884:kiblnd_recv()) Skipped 477 previous similar messages

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I then set that option in the ko2iblnd module parameters and brought everything back up but it was still encountering that issue.

If, however, I dd either of the files to /dev/null first I am then able to read them normally. This was the case for both user_fastreg_gaps set to 1 or 0.

Whamcloud Community JIRA

[LU-11105] Seeing "Using FastReg with no GAPS support" that can't be resolved