Re: Why we are going to have to go DirectIO

On 12/04/2013 07:33 AM, Jonathan Corbet wrote:

>
> Wow, Josh, I'm surprised to hear this from you.
>
> The active/inactive list mechanism works great for the vast majority of
> users.  The second-use algorithm prevents a lot of pathological behavior,
> like wiping out your entire cache by copying a big file or running a
> backup.  We *need* that kind of logic in the kernel.
>
>
> The amount of automated testing, including performance testing, has
> increased markedly in the last couple of years.  I bet that it would not
> be hard at all to get somebody like Fengguang Wu to add some
> Postgres-oriented I/O tests to his automatic suite:
>
>     https://lwn.net/Articles/571991/
>
> Then we would all have a much better idea of how kernel releases are
> affecting one of our most important applications; developers would pay
> attention to that information.
>
> Or you could go off and do your own thing, but I believe that would leave
> us all poorer.

Thank you for your very well thought out, and knowledgeable response. 
This is certainly helpful and highlights what a lot of us were already 
stating.

Sincerely,

Joshua D. Drake


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