Re: [PATCH 0/4] IB: decrease large contigous allocation

[Leon Romanovsky]

On Tue, Sep 18, 2018 at 08:46:23AM -0600, Jason Gunthorpe wrote:
> On Tue, Sep 18, 2018 at 04:03:42PM +0300, Jan Dakinevich wrote:
> > The size of mlx4_ib_device became too large to be allocated as whole contigous
> > block of memory. Currently it takes about 55K. On architecture with 4K page it
> > means 3rd order.
> >
> > This patch series makes an attempt to split mlx4_ib_device into several parts
> > and allocate them with less expensive kvzalloc
>
> Why split it up? Any reason not to just allocate the whole thing with
> kvzalloc?

And before we are rushing to dissect mlx4_ib driver, can you
explain the rationale behind this change? The mlx4_ib driver
represents high-performance device which needs enough memory
resources to operate. Those devices are limited by number
of PCIs and SRIOV VFs (upto 126) and very rare allocated/deallocated.

I would like to see real rationale behind such change.

Thanks

>
> Jason

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