[openib-general] [PATCH] use mmiowb after doorbell ring

[Michael S. Tsirkin]

Quoting r. Roland Dreier <rdreier at cisco.com>:
> > Hopefully that is under prefix:
> > $prefix/etc/libibverbs.conf.d/
> 
> Well, $sysconfdir/libibverbs.conf.d

Ugh, is that a problem if I want to build and run as non-root?
I'm used to be able to set --prefix on config line for all libs
to some directory, put LD_LIBRARY_PATH to point there, then
if I like I just blow all of it away and I get a clean system.
Scattering config files around in home directory etc will break this.

> > Finally, it might be nice to be able to just specify the list of
> > plugins at configure time for people like me who buuild everything
> > from source and who want less flexibility
> > but also less files to install.
> 
> Again, is that really any easier

Well, I'm thinking of distributed systems mainly where copying extra
files around is additional pain.
Consider myself: I'm building things on my laptop, then pushing them out to
machines in the lab over rsync for testing. Less files - less headache.

> than putting whatever you want into
> your .libibverbs.conf?

I really don't think a library sticking things in user's home directory
is such a great idea - typical users don't really know they link against
some library, this is just an extra place that users can break:
move to another machine, things stop working, and your app's
manual does not say anything of course.

> I definitely plan to make it so a missing plug-in is not fatal, so it
> shouldn't hurt to have extra drivers declared that you don't build
> every time.

Not until someone decides to rename a plugin for some reason - then you have to
hunt down and kill the old file name to prevent an old version stuck in library
path for some reason from being loaded - easy with the central location, but
good luck walking all user's home directories.

-- 
MST