Re: [Ksummit-2008-discuss] Kernel Summit Request for Discussion: The Future of Target mode and Cloud storage on Linux

[James Bottomley <James.Bottomley@HansenPartnership.com>]

On Fri, 2008-08-22 at 23:00 +0400, Vladislav Bolkhovitin wrote:
> James Bottomley wrote:
> > On Thu, 2008-08-21 at 18:31 -0500, Mike Christie wrote:
> >> I think James also said something about moving STGT in-kernel to get 
> >> performance gains, but I do not think it means that we have to push 
> >> exact code that sits in Tomo's git tree from usrspace into the kernel. 
> >> If along the way we replace it with scst or Nick's code and we end up 
> >> with a variant of scst or Nicks code that can still support userspace 
> >> targets then I do not think any one is going to make long threads like 
> >> these have resulted in :)
> > 
> > I meant actually allowing performance critical pieces to work either
> > in-user or in-kernel.  How, I'm not sure ... if we could use the same
> > code for both, that would be brilliant ... if we have to have separate
> > pieces, that will be OK.
> > 
> > The error injection and transport debug people think it's important to
> > have the state machine in user space for fast prototyping and debugging,
> > so I'm not going to take this away from them.
> 
> Nobody has been asking you about that. Simply, there's no need in it.

I wasn't aware you were privy to my conversations ... however, I suggest
that you must have missed it.

Quite a few people who want to work on transports don't have the budget
for the hardware.  Emulators are things they use to get around this
problem.  To them, therefore, it's a definite need.

> >> Will this work for everyone?
> > 
> > Sounds like a plan.  (However, it also sounds suspiciously like the last
> > plan we had from the storage summit which didn't actually attract any
> > implementers ...)
> 
> I at that time heard nothing about it. Nobody asked me, nobody let me 
> know about it and nobody asked me to participate. Nothing about it was 
> in linux-scsi. It was completely behind my back.

http://www.usenix.org/events/lsf08/

summaries page 6.

The invitation to participate was here:

http://marc.info/?t=119325401900042

James