From: Tim Menninger <tmenninger@everpuredata.com>
To: Chuck Lever <cel@kernel.org>
Cc: Trond Myklebust <trondmy@kernel.org>,
Anna Schumaker <anna@kernel.org>, Tejun Heo <tj@kernel.org>,
Lai Jiangshan <jiangshanlai@gmail.com>,
linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org,
Eric Badger <ebadger@everpuredata.com>,
Jon Curley <jcurley@everpuredata.com>
Subject: Re: [PATCH RFC 6/8] SUNRPC: Reduce rpciod workqueue contention
Date: Wed, 16 Sep 2026 23:25:43 +0000 [thread overview]
Message-ID: <20260916232543.4100078-1-tmenninger@everpuredata.com> (raw)
In-Reply-To: <0e2f9688-097c-4bb9-a7ec-82b41bdb3653@slotpi15m67>
I took the SLUB side of this to linux-mm as you suggested:
https://lore.kernel.org/linux-mm/20260916232227.4098143-1-tmenninger@everpuredata.com/
The more careful reruns also resolved the inconsistency you pointed
out between the perf-lock wait time and the idle CPU measurement.
When mpstat is collected during the same 10-second perf-lock window,
the machine is almost fully utilized and throughput drops
substantially; without that instrumentation there is significant idle
CPU remaining.
I also collected cmpxchg_double_fail over uninstrumented 10-second
windows in several NUMA/CQ placements. Those numbers are included in
the linux-mm report.
Thanks again for helping separate the allocator behavior from the NFS
regression.
next prev parent reply other threads:[~2026-09-16 23:25 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-31 18:21 [PATCH RFC 0/8] Reduce lock contention in the NFS client Chuck Lever
2026-08-31 18:21 ` [PATCH RFC 1/8] SUNRPC: Use atomic_t for XID allocation Chuck Lever
2026-08-31 18:21 ` [PATCH RFC 2/8] SUNRPC: Execute initial async RPC states in caller's context Chuck Lever
2026-08-31 18:21 ` [PATCH RFC 3/8] SUNRPC: Split recv_lock out of xprt->queue_lock Chuck Lever
2026-08-31 18:22 ` [PATCH RFC 4/8] Set WQ_SYSFS on key NFS-related workqueues Chuck Lever
2026-08-31 18:22 ` [PATCH RFC 5/8] workqueue: Export the functions needed for WQ attribute modification Chuck Lever
2026-08-31 18:22 ` [PATCH RFC 6/8] SUNRPC: Reduce rpciod workqueue contention Chuck Lever
2026-09-02 20:40 ` Tim Menninger
2026-09-03 13:33 ` Chuck Lever
2026-09-03 23:50 ` Tim Menninger
2026-09-04 14:13 ` Chuck Lever
2026-09-04 23:23 ` Tim Menninger
2026-09-06 16:21 ` Chuck Lever
2026-09-08 18:19 ` tmenninger
2026-09-08 21:11 ` Chuck Lever
2026-09-08 23:39 ` tmenninger
2026-09-09 16:14 ` Chuck Lever
2026-09-12 14:59 ` tmenninger
2026-09-12 15:49 ` Chuck Lever
2026-09-13 13:13 ` tmenninger
2026-09-13 16:40 ` Chuck Lever
2026-09-14 17:39 ` tmenninger
2026-09-15 14:42 ` Chuck Lever
2026-09-16 23:25 ` Tim Menninger [this message]
2026-08-31 18:22 ` [PATCH RFC 7/8] NFS: Reduce nfsiod " Chuck Lever
2026-08-31 18:22 ` [PATCH RFC 8/8] SUNRPC: Reduce xprtiod " Chuck Lever
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