Re: [LSF/MM/BPF TOPIC] Large block for I/O

Matthew Wilcox
2023-12-21T20:42:28Z

On Thu, Dec 21, 2023 at 12:33:08PM -0800, Bart Van Assche wrote:
> On 12/20/23 07:03, Hannes Reinecke wrote:
> > I would like to discuss
> >
> > Large blocks for I/O
> >
> > Since the presentation last year there has been quite some developments
> > and improvements in some areas, but at the same time a lack of progress
> > in other areas.
> > In this presentation/discussion I would like to highlight the current
> > state of affairs, existing pain points, and future directions of development.
> > It might be an idea to co-locate it with the MM folks as we do have
> > quite some overlap with page-cache improvements and hugepage handling.
>
> Hi Hannes,
>
> I'm interested in this topic. But I'm wondering whether the disadvantages of
> large blocks will be covered? Some NAND storage vendors are less than
> enthusiast about increasing the logical block size beyond 4 KiB because it
> increases the size of many writes to the device and hence increases write
> amplification.

It's LSF/MM. If this session is being run as a presentation rather than
discussion, it's being done wrongly. So if you want to talk about the
downsides, show up and talk about them.