Summary
According to comments in __cache_pool_assess(), the code assumes that pages are 4KB when performing logging calculations. This could lead to incorrect logging results if the actual page size were not 4KB. See code extract below:
 

*
* Count pages read, assuming pages are 4KB.
*/
tmp = cache->bytes_read >> 12;
if (tmp >= cache->cp_saved_read)
  reads = tmp - cache->cp_saved_read;
else
  reads = tmp;
cache->cp_saved_read = tmp;

Motivation

• Does this affect any team outside of WT?
  No

• How likely is it that this use case or problem will occur?
  Likely

• If the problem does occur, what are the consequences and how severe are they?
  Logging is not correct

• Is this issue urgent?
  No

Acceptance Criteria (Definition of Done)
The code is changed to use the actual page size, not an assumed one.

• Documentation update
  No