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

[Mikulas Patocka]

> Mikulas Patocka <mpatocka@xxxxxxxxxx> writes:
>
> > I'm getting crashes with InitIO A100u2w controller on Sparc64 (I had
> > to fix the endianity issues in the driver, but that's unrelated).
>
> x86-64 (and powerpc) solved this a long time ago by only doing
> opportunistic merging: as in don't announce to the block layer
> that you can merge, but try to merge anyways. This way SG lists
> are not necessarily filled completely, but it's still better
> than overflowing them in some rare cases.
>
> -Andi

There's option "biomerge" that enables that feature. I'm wondering, if 
there's some situation when it should be used.

Mikulas
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