Re: [RFC PATCH 0/2] cxl: BG operations and device sanitation

[Dave Jiang]

On 8/4/2022 1:07 PM, Davidlohr Bueso wrote:
> On Thu, 04 Aug 2022, Dave Jiang wrote:
>
> > From the operational sense everything looks good to me. As for the
> > polling delay on overwrite, with pre-CXL pmem on Optane, we've
> > discovered that overwrite can take a long time depending on the size.
> > Sometimes MANY hours if the size is really large. We just opted to
> > increment the polling interval as time went on [1] instead of based on
> > size.
>
> Thanks for having a look. Sure, we can do that, I have no particular 
> attachment
> to doing it based on size (it's just the way it occured to me). I am 
> curious,
> though: While regardless of size vs time based estimates, are the numbers
> expected to be similar for volatile regions? All these numbers being from
> nvdimm DSM docs.

I don't either. Just pointing out that's what we did with the Optane 
stuff. I think that the volatile devices (DRAM?) would probably be a lot 
faster when it comes to writes. So maybe won't take as long. And also 
perhaps smaller in size in the immediate future? Just guessing.


> Thanks,
> Davidlohr