linux-kernel - [PATCH v3 09/15] docs: add io

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Message-Id: <20240806-isolcpus-io-queues-v3-9-da0eecfeaf8b@suse.de>
Date: Tue, 06 Aug 2024 14:06:41 +0200
From: Daniel Wagner <dwagner@...e.de>
To: Jens Axboe <axboe@...nel.dk>, Keith Busch <kbusch@...nel.org>, 
 Sagi Grimberg <sagi@...mberg.me>, Thomas Gleixner <tglx@...utronix.de>, 
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Cc: Frederic Weisbecker <frederic@...nel.org>, Mel Gorman <mgorman@...e.de>, 
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 Daniel Wagner <dwagner@...e.de>
Subject: [PATCH v3 09/15] docs: add io_queue as isolcpus options

isolcpus learned a new io_queue options. Explain what it does.

Signed-off-by: Daniel Wagner <dwagner@...e.de>
---
 Documentation/admin-guide/kernel-parameters.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index f1384c7b59c9..a416cc969e97 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -2446,6 +2446,15 @@
 			  housekeeping CPUs has no influence on those
 			  queues.

+			io_queue
+			  Isolate CPUs from IO queue placement by
+			  multiqueue drivers. Multiqueue drivers are
+			  allocating and distributing IO queues on all
+			  CPUs. When this option is set, the drivers will
+			  allocated only IO queues on the housekeeping
+			  CPUs. This option can't be used toghether with
+			  managed_irq, use one or the other.
+
 			The format of <cpu-list> is described above.

 	iucv=		[HW,NET]

-- 
2.46.0