netdev - Re: Softirq priority inversion from "softirq: reduce latencies"

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Message-Id: <20160227.180403.2101360385050644823.davem@davemloft.net>
Date:	Sat, 27 Feb 2016 18:04:03 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	peter@...leysoftware.com
Cc:	eric.dumazet@...il.com, edumazet@...gle.com,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	gregkh@...uxfoundation.org, dmaengine@...r.kernel.org,
	john.ogness@...utronix.de, bigeasy@...utronix.de,
	akpm@...ux-foundation.org
Subject: Re: Softirq priority inversion from "softirq: reduce latencies"

From: Peter Hurley <peter@...leysoftware.com>
Date: Sat, 27 Feb 2016 12:29:39 -0800

> Not really. softirq raised from interrupt context will always execute
> on this cpu and not in ksoftirqd, unless load forces softirq loop abort.

That guarantee never was specified.

Or are you saying that by design, on a system under load, your UART
will not function properly?

Surely you don't mean that.