[Ksummit-discuss] [TOPIC] userspace infrastructure services
Christoph Hellwig
hch at infradead.org
Wed Aug 12 18:21:03 UTC 2015
On Wed, Aug 12, 2015 at 11:15:52AM -0700, Stephen Hemminger wrote:
> I expected someone else to bring this topic up...
>
> One thing that is happening is that there is lots of activity in moving core features
> of the kernel into userspace (networking, storage, security). I don't want to get into
> an argument over whether that is good or bad;
Which I think is the most important question of them all. From all
the pain caused and the little gains I'm a believer it's mostly bad,
especially for cases like:
> The area I am most familiar with is the DPDK which has to have its own UIO drivers
> to work in all environments (get device into userspace). And then has to have its
> own drivers to simulate network device (put device back into kernel). This leads
> to unmanageable ABI and development technical debt.
Which interacts on both sides. In that case "let them suffer for their
stupidity" is the only valid answer.
For a case where it's more reasonable there might be a different answer.
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