This bug was fixed in the package linux - 5.15.0-17.17
---------------
linux (5.15.0-17.17) jammy; urgency=medium
* jammy/linux: 5.15.0-17.17 -proposed tracker (LP: #1957809)
-- Andrea Righi <andrea.ri...@canonical.com> Thu, 13 Jan 2022 17:11:21
+0100
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1947206
Title:
Updates to ib_peer_memory requested by Nvidia
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Focal:
Fix Committed
Status in linux source package in Hirsute:
Fix Released
Status in linux source package in Impish:
Fix Released
Bug description:
[Impact]
Nvidia notified me via private email that they'd discovered some issues with
the ib_peer_memory patch we are carrying in hirsute/impish and sent me a patch
intended to resolve them. My knowledge of these changes is limited to what is
mentioned in the commit message:
- Allow clients to opt out of unmap during invalidation
- Fix some bugs in the sequencing of mlx5 MRs
- Enable ATS for peer memory
[Test Case]
ib_write_bw from the perftest package, rebuilt with CUDA support, can be used
as a smoke test of this feature. I'll attach a sample test script here. I've
verified this test passes with the kernels in the archive, and continues to
pass with the provided patch applied.
[Fix]
Nvidia has emailed me fixes for both trees. They are not currently available
in a public tree elsewhere, though I'm told at some point they should end up in
a branch here:
https://git.kernel.org/pub/scm/linux/kernel/git/leon/linux-rdma.git/
[What could go wrong]
The only known use case for ib_peer_memory are Nvidia GPU users making use of
the GPU PeerDirect feature where GPUs can share memory with one another over an
Infiniband network. Bugs here could cause problems (hangs, crashes, corruption)
with such workloads.
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