Re: VM issue causing high CPU loads

From: Trond Myklebust
Date: Thu Sep 03 2009 - 16:49:41 EST

On Thu, 2009-09-03 at 13:05 -0700, Simon Kirby wrote:
> On Thu, Sep 03, 2009 at 10:02:06AM -0400, Trond Myklebust wrote:
> > OK, so 16 hash buckets are likely to be filled with ~10^6 entries each.
> > I can see that might be a performance issue...
> We have a similar setup with millions of UIDs over NFS (currently NFSv3).
> I _wish_ there were a way to use NFSv4 without having to use name-mapped
> UIDs and GIDs, since our user and group names come from MySQL anyway, and
> are guaranteed to be consistent across machines.

That's a separate issue.

I'm working on increasing the idmapper scalability, however another
project is currently taking up most of my time. I can't guarantee that
the revised idmapper code will be finished in time to allow for
inclusion in 2.6.32.

> Why on earth does NFSv4 force the use of names?

NFSv4 aspires to be an internet-wide protocol, and so you cannot use
uids/gids: they just aren't guaranteed to represent a unique user
outside your local LDAP/NIS or /etc/passwd domain. Furthermore, uids and
gids are a posix construct. They simply don't work in environments where
you may have lots of non-posix systems.


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