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Re: nfs server performance (netbsd-5)
On Tue, Apr 27, 2010 at 10:51:16PM +0000, Christos Zoulas wrote:
> >3.) I proposed a Google Summer of Code project to get this fixed:
> > http://mail-index.netbsd.org/tech-net/2010/04/06/msg002004.html
> Solution 2 does not work because there are always race conditions
> when you mount and access things from userland.
Why would that happen? The puffs file-system can surely block all
requests to the same path while it is mounting a remove
file-system on it.
> The automounter is a userspace application already;
I know, I mention that in my proposal.
> ... it pretends to be an NFS server for all the "auto" directories it
> manages ...
Yes, and using NFS causes IMHO a lot unnecessary overhead. puffs should
be much more efficient because it e.g. doesn't have to encode all
actions via RPC.
> The problem is that it forks in order to do things in parallel and non
> blocking form, and one child can race with another child undoing what
> the first child does.
Well, that sounds like an implementation problem rather like a
Matthias Scheler http://zhadum.org.uk/
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