[LU-9565] lnet-selftest: Newly added "off" parameter no longer working Created: 26/May/17  Updated: 26/Jun/17

Status: Open
Project: Lustre
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Bug Priority: Minor
Reporter: Doug Oucharek (Inactive) Assignee: Amir Shehata (Inactive)
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Blocker
is blocking LU-9500 MOFED 4/mlx5: Aligning non-aligned pa... Resolved
Severity: 3
Rank (Obsolete): 9223372036854775807

 Description   

While working on LU-9500, I needed to create a message stream where the first fragment in the scatter/gather lists do not start page aligned.  This can be done via lnet-selftest by using a new parameter, "off", which was added in patch: https://review.whamcloud.com/#/c/12496/.  This is no working anymore.

The lnet-selftest code itself seems to be erring on the parameter.

 Comments   
Comment by Doug Oucharek (Inactive) [ 29/May/17 ]

Looks like this problem has been there since the beginning of this new parameter.  When you use a bulk size of 1M and apply an offset (i.e. "off=64), the system will need 257 fragments which is greater than the max allowed of 256.  

The workaround is to use a smaller size (i.e. "size=512K").  It would be good if lnet-selftest allows for 257 fragments as the max to accommodate the offset parameter.

I'm leaving this ticket open to do just that, but lowering the priority to minor.

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