Re: [PATCH 1/2] block: support different tag allocation policy

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On Sun, Dec 14, 2014 at 07:21:49PM -0800, Shaohua Li wrote:
> The libata tag allocation is using a round-robin policy. Next patch will
> make libata use block generic tag allocation, so let's add a policy to
> tag allocation.
> 
> Currently two policies: FIFO (default) and round-robin.

What's the benefit of round robin allocation?  Why do you only need
it for the old simple allocator, and no policy control for the more
complex blkpmq allocator?
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