Re: [00/17] Large Blocksize Support V3

[Nick Piggin]

William Lee Irwin III wrote:
> On Fri, Apr 27, 2007 at 01:38:30AM +1000, Nick Piggin wrote:
>
> > Or good grounds to increase the sg limit and push for io controller
> > manufacturers to do the same. If we have a hack in the kernel that
> > mostly works, they won't.
>
>
> On Fri, Apr 27, 2007 at 01:38:30AM +1000, Nick Piggin wrote:
>
> > Page colouring was always rejected, and lots of people who knew
> > better got upset because it was the only way the hardware would go
> > fast...
>
>
> Yes, stunning wisdom there. Reject the speedups.

Yeah, that's how lots of people felt. But there is a good argument
to do just that.


> On Fri, Apr 27, 2007 at 01:38:30AM +1000, Nick Piggin wrote:
>
> > You could put it that way. Or that it is wrong because of the
> > fragmenatation problem. Realise that it is somewhat fundamental
> > considering that it is basically an unsolvable problem with our
> > current kernel assumptions of unconstrained kernel allocations and
> > a 1:1 kernel mapping.
>
>
> Depends on what you consider a solution. A broadly used criterion is
> that improves performance significantly in important usage cases.

My criterion is that you are not suddenly unable to access your
filesystem because you cannot allocate a higher order page.

--
SUSE Labs, Novell Inc.
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/