[Bugs] [Bug 1393419] read-ahead not working if open-behind is turned on

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1393419



--- Comment #14 from Raghavendra G <rgowdapp at redhat.com> ---
(In reply to Raghavendra G from comment #13)
> We can see that performance gets affected by the number of read-ahead page
> count in both scenarios - with/without fix.

1. If read-ahead is indeed turned off, there should be no effect on performance
by tweaking page-count.
2. When read-ahead is enabled, performance with page-count 1 seems to be better
than performance with higher page-count.

Both of the above behavior need to be explained.

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