netdev - RE: [PATCH] igb: add module param to set max-rss-queues.

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DCFFBA6BB@AcuExch.aculab.com>
Date:   Mon, 27 Mar 2017 09:26:20 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     "'greearb@...delatech.com'" <greearb@...delatech.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] igb:  add module param to set max-rss-queues.

From: greearb@...delatech.com
> Sent: 24 March 2017 20:59
> From: Ben Greear <greearb@...delatech.com>
> 
> In systems where you may have a very large number of network
> adapters, certain drivers may consume an unfair amount of
> IRQ resources.  So, allow a module param that will limit the
> number of IRQs at driver load time.  This way, other drivers
> (40G Ethernet, for instance), which probably will need the
> multiple IRQs more, will not be starved of IRQ resources.

ISTM that the functions for allocating MSI-X should allow a
driver to request additional interrupts after the original probe.

Then drivers than can use additional interrupts but get probed
early won't use up all the vectors before other drivers get
a chance.

	David