Re: [PATCH blktests] zbd/005: Limit block size to zone length

[Sean Anderson <seanga2@gmail.com>]

On 4/25/25 09:47, hch@infradead.org wrote:
> On Fri, Apr 25, 2025 at 12:04:39AM -0400, Sean Anderson wrote:
>> and in userspace that assumes 512-byte granularity. But there is no
>> such deeply-ingrained assumption for zones. You just have to set the
>> parameter correctly.
> 
> There are everywhere in software actually using zones.  You still
> haven't answered whay your intended use case is, btw.

I'm working on testing... I thought I would send a few bug fixes upstream in advance...

who knew I would get such a hostile response

>> Plus, smaller zones are more efficient at reducing write amplification,
>> in the same way as smaller block sizes.
> 
> No, they aren't.  If you zones are only a few kb you will waste a lot
> of effort to actually track their state.

The state is perhaps 4-8 bytes at most? And in any case it's proportional to
the number of zones. If you have a smaller drive you will naturally have smaller zones.

--Sean