Re: [PATCH rdma-core 2/4] glue/redhat: add udev/systemd/etc infrastructure bits

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Mon, Oct 17, 2016 at 02:56:37PM -0400, Doug Ledford wrote:
 
> Since it got snipped, I'm pretty sure it just lists opensm in the Wants=
> tag.  With systemd, that's a soft dependency.  Only if opensm is
> installed and configured to start anyway does systemd then order this
> item after opensm.  Since you need opensm for links to come up anyway,
> it makes sense for the order of startup for RDMA related items to be:

Daemons should not require opensm to be started to operate
correctly.

If they do we surely have a boot race bug that should be fixed,
because we cannot rely on a remote SM to have configured the port the
time window betweeen rdma.service completion and dependent service
start.

So I view every use of a opensm dependent in a unit file as either
unnecessary or working around a bug.. Lets ID the bugs so we at least
know where we stand..

Plus, there are more SM's than opensm, so we really should not
hardwire a single SM in the service files upstream, but try and work
with all the SMs...

Jason
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