Re: [PATCHv10 0/9] write hints with nvme fdp, scsi streams

[Johannes Thumshirn <Johannes.Thumshirn@wdc.com>]

On 11.11.24 10:31, Javier Gonzalez wrote:
> On 11.11.2024 07:51, Christoph Hellwig wrote:
>> On Fri, Nov 08, 2024 at 05:43:44PM +0000, Javier Gonzalez wrote:
>>> We have been iterating in the patches for years, but it is unfortunately
>>> one of these series that go in circles forever. I don't think it is due
>>> to any specific problem, but mostly due to unaligned requests form
>>> different folks reviewing. Last time I talked to Damien he asked me to
>>> send the patches again; we have not followed through due to bandwidth.
>>
>> A big problem is that it actually lacks a killer use case.  If you'd
>> actually manage to plug it into an in-kernel user and show a real
>> speedup people might actually be interested in it and help optimizing
>> for it.
>>
> 
> Agree. Initially it was all about ZNS. Seems ZUFS can use it.
> 
> Then we saw good results in offload to target on NVMe-OF, similar to
> copy_file_range, but that does not seem to be enough. You seem to
> indicacte too that XFS can use it for GC.
> 
> We can try putting a new series out to see where we are...

I don't want to sound like a broken record, but I've said more than 
once, that btrfs (regardless of zoned or non-zoned) would be very 
interested in that as well and I'd be willing to help with the code or 
even do it myself once the block bits are in.

But apparently my voice doesn't count here