From: Jakub Kicinski <kuba@kernel.org>
To: "D. Wythe" <alibuda@linux.alibaba.com>
Cc: "David S. Miller" <davem@davemloft.net>,
Dust Li <dust.li@linux.alibaba.com>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>,
Sidraya Jayagond <sidraya@linux.ibm.com>,
Wenjia Zhang <wenjia@linux.ibm.com>,
Mahanta Jambigi <mjambigi@linux.ibm.com>,
Simon Horman <horms@kernel.org>,
Tony Lu <tonylu@linux.alibaba.com>,
Wen Gu <guwen@linux.alibaba.com>,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-s390@vger.kernel.org, netdev@vger.kernel.org,
oliver.yang@linux.alibaba.com, pasic@linux.ibm.com
Subject: Re: [PATCH net-next 0/2] net/smc: transition to RDMA core CQ pooling
Date: Tue, 2 Jun 2026 14:03:59 -0700 [thread overview]
Message-ID: <20260602140359.3b97d180@kernel.org> (raw)
In-Reply-To: <20260528084819.6059-1-alibuda@linux.alibaba.com>
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.
next prev parent reply other threads:[~2026-06-02 21:04 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-28 8:48 [PATCH net-next 0/2] net/smc: transition to RDMA core CQ pooling D. Wythe
2026-05-28 8:48 ` [PATCH net-next v2 1/2] " D. Wythe
2026-05-28 8:48 ` [PATCH net-next v2 2/2] net/smc: reduce TX slot contention with exclusive wait D. Wythe
2026-06-02 21:03 ` Jakub Kicinski [this message]
-- strict thread matches above, loose matches on Subject: below --
2026-05-08 6:37 [PATCH net-next 0/2] net/smc: transition to RDMA core CQ pooling D. Wythe
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