[PATCHv10 9/9] scsi: set permanent stream count in block limits

[Keith Busch]

On Wed, Oct 30, 2024 at 05:57:08PM +0100, Christoph Hellwig wrote:
> On Wed, Oct 30, 2024 at 10:42:59AM -0600, Keith Busch wrote:
> > With FDP (with some minor rocksdb changes):
> > 
> > WAF:        1.67
> > IOPS:       1547
> > READ LAT:   1978us
> > UPDATE LAT: 2267us
> 
> Compared to the Numbers Hans presented at Plumbers for the Zoned XFS code,
> which should work just fine with FDP IFF we exposed real write streams,
> which roughly double read nad wirte IOPS and reduce the WAF to almost
> 1 this doesn't look too spectacular to be honest, but it sure it something.

Hold up... I absolutely appreciate the work Hans is and has done. But
are you talking about this talk?

https://lpc.events/event/18/contributions/1822/attachments/1464/3105/Zoned%20XFS%20LPC%20Zoned%20MC%202024%20V1.pdf

That is very much apples-to-oranges. The B+ isn't on the same device
being evaluated for WAF, where this has all that mixed in. I think the
results are pretty good, all things considered.
 
> I just wish we could get the real infraѕtructure instead of some band
> aid, which makes it really hard to expose the real thing because now
> it's been taken up and directly wired to a UAPI.
> one

I don't know what make of this. I think we're talking past each other.