[Bug 1826439] Review Request: libvma - LD_PRELOAD-able library with standard BSD sockets API

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https://bugzilla.redhat.com/show_bug.cgi?id=1826439



--- Comment #24 from Honggang LI <honli@xxxxxxxxxx> ---
(In reply to Michal Schmidt from comment #23)

> > > 30-libvma-limits.conf:
> > > > # Default limits that are needed for proper work of libvma
> > > > # Read more about this topic in the VMA's User Manual
> > > > *             -   memlock        unlimited
> > > > *          soft   memlock        unlimited
> > > > *          hard   memlock        unlimited
> > > 
> > > Does having the package installed give every user on the system the
> > > permission to mlock unlimited amounts of RAM? Is that really necessary?
> > > Could it be at least limited to a user group?
> > 
> > There is such recommendation at
> > https://docs.mellanox.com/display/VMAv902/VMA+Installation+Options that
> > forces to
> > https://github.com/Mellanox/libvma/wiki/VMA-over-RHEL-7.x-with-inbox-
> > driver#4-common-configurations
> 
> Thanks for the pointer, but it does not answer the question why the memlock
> resource limit has to be lifted for all users by default. Have other options
> been considered? Could it be limited to a user group? i.e.:
> @libvmauser  -  memlock  unlimited

In real HPC production environment, we are always to lifted the resource for
all users. For example, see "13.5.3. Relaxing memlock restrictions for users"

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/sec-configuring_the_base_rdma_subsystem


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