Re: [SUGGESTION]: drop virtual merge accounting in I/O requests

[David Miller]

From: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Date: Sun, 13 Jul 2008 19:53:01 -0400 (EDT)

> There is no need to turn BIO merge off --- the problem is caused by 
> accounting of BIO merging in block layer, not by BIO merging itself.
> 
> Just do #define BIO_VMERGE_BOUNDARY 0, and that disables the accounting, 
> but leaves merging as it is.

For the thousanth time, the BIO_VMERGE_BOUNDARY code is useful
and worked perfectly fine before segment boundary handling was
added to the block layer.

It's a regression, and as such should be fixed or the guilty
code reverted.

Since when do we say "sorry that got broken, turn it off, thanks"
?
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