On Thu, Sep 21, 2023 at 12:39:00PM -0700, Bart Van Assche wrote:
> On 9/21/23 12:27, Matthew Wilcox wrote:
> > On Thu, Sep 21, 2023 at 07:27:08AM -0700, Bart Van Assche wrote:
> > > On 9/21/23 00:46, Niklas Cassel wrote:
> > > > Should NVMe streams be brought back? Yes? No?
> > >
> > > From commit 561593a048d7 ("Merge tag 'for-5.18/write-streams-2022-03-18'
> > > of git://git.kernel.dk/linux-block"): "This removes the write streams
> > > support in NVMe. No vendor ever really shipped working support for this,
> > > and they are not interested in supporting it."
> >
> > It sounds like UFS is at the same stage that NVMe got to -- standard
> > exists, no vendor has committed to actually shipping it. Isn't bringing
> > it back a little premature?
>
> Hi Matthew,
>
> That's a misunderstanding. UFS vendors support interpreting the SCSI GROUP
> NUMBER as a data temperature since many years, probably since more than ten
> years. Additionally, for multiple UFS vendors having the data temperature
> available is important for achieving good performance. This message shows
> how UFS vendors were using that information before write hint support was
> removed: https://lore.kernel.org/linux-block/PH0PR08MB7889642784B2E1FC1799A828DB0B9@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
If vendor support already exists, then why did you dodge the question
asking for quantified data that I asked earlier? And can we have that
data now?
