kva size on amd64

[Andriy Gapon]

on 17/10/2012 12:46 Andriy Gapon said the following:
> 
> What are the main benefits, if any, of limiting KVA space size - or in fact
> tying it to physical memory size - on amd64?
> This question is perhaps relevant to other platforms with "unlimited kva" too.

I actually already have patch that auto-sets kmem_size to kmem_size_max on amd64.

My primary motivation is that I from time to time still see reports about too
small kmem_map on non-tuned amd64 systems.   This is really ridiculous
regardless of whether there is ZFS in use or not.

Another motivation is that I really see no reason at all to artificially limit
KVA.  This creates no benefits, increases fragility and reduces flexibility.


-- 
Andriy Gapon