On Wed, Oct 30, 2024 at 05:57:08PM +0100, Christoph Hellwig wrote: > > On Wed, Oct 30, 2024 at 04:50:52PM +0100, Christoph Hellwig wrote: > > > It sets temperature hints for different SST levels, which already > > happens today. The last data point made some minor changes with > > level-to-hint mapping. > > Do you have a pointer to the changes? The change moves levels 2 and 3 to "MEDIUM" (along with 0 and 1 already there), 4 to "LONG", and >= 5 remain "EXTREME". WAL continues to be "SHORT", as before. > > Without FDP: > > > > WAF: 2.72 > > IOPS: 1465 > > READ LAT: 2681us > > UPDATE LAT: 3115us > > > > With FDP (rocksdb unmodified): > > > > WAF: 2.26 > > IOPS: 1473 > > READ LAT: 2415us > > UPDATE LAT: 2807us > > > > 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. > > 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 This doesn't have to be the end placement streams development. I fundamentally disagree that this locks anyone in to anything.
