Re: [PATCH 0/11] Update version of write stream ID patchset

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>>>>> "Boaz" == Boaz Harrosh <boaz@xxxxxxxxxxxxx> writes:

Boaz> Does it make any sense to you? I mean with multy-queue with HW
Boaz> channels for every CPU, parallel IO, and poling because even
Boaz> interrupts are too slow, you want me to cram everything and
Boaz> serialize it on 4 open/close streams?

Boaz> Either I'm completely missing something. Or please please explain
Boaz> what is going on. How does 4 stream make any sense in today's NvME
Boaz> HW? How does open/close anything make any sense?

For number of streams you should think hardware flash channels.

Boaz> On the surface it looks like someone is smoking something really
Boaz> bad.

No, the hardware folks have good reasons why they want things to work a
certain way.

I am mostly objecting to the fact that the model of the current streams
proposal is heavily biased towards a fairly narrow use case and closely
tied to how current generations of flash controllers are implemented.

I would like to see a bit more abstraction put into the model so it is
less "controller with N flash-channels and anemic ARM core"
centric. That obviously means more complexity in the controller design,
hence the pushback from the vendors. However, I think it'll be worth it
in the long run.

-- 
Martin K. Petersen	Oracle Linux Engineering
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