On Thu, 28 May 2026 16:48:17 +0800 D. Wythe wrote:

This series transitions SMC-R completion handling to RDMA core CQ pooling
via the ib_cqe API. The new completion model improves scalability by
allowing per-link completion processing across multiple cores and enables
DIM-based interrupt moderation.

As a side effect, the increased concurrency can amplify contention for TX
slots on the shared wait queue. Patch 2 addresses this by switching TX slot
allocation from non-exclusive wait_event() to prepare_to_wait_exclusive(),
which avoids thundering-herd wakeups under contention.

Patch 1 replaces the global per-device CQ and manual tasklet polling model
with RDMA core CQ pooling.
Patch 2 reduces TX slot contention by using exclusive wait queue entries
during allocation.

Sashiko reports a couple of issues on patch 1:
https://sashiko.dev/#/patchset/20260528084819.6059-2-alibuda@linux.alibaba.com
Are these legit?

Either way - would be good to get some reviews here from (ohter) SMC
maintainers.