linux-kernel - Re: Regression: Failed boots bisected to 4cd13c21b207 "softirq: Let ksoftirqd do its job"

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Message-ID: <20170206184942.GM27312@n2100.armlinux.org.uk>
Date:   Mon, 6 Feb 2017 18:49:42 +0000
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Will Deacon <will.deacon@....com>
Cc:     Brian Starkey <brian.starkey@....com>,
        Eric Dumazet <edumazet@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Potapenko <glider@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: Regression: Failed boots bisected to 4cd13c21b207 "softirq: Let
 ksoftirqd do its job"

On Mon, Feb 06, 2017 at 06:46:19PM +0000, Will Deacon wrote:
> Converting the smc91x driver over to NAPI would probably solve this problem,
> but given the "vintage" of this code, I'd be more tempted by a simpler
> point fix if only I could think of one.

I'm not sure if converting it to NAPI would solve it, or just move
the problem elsewhere - IOW, move it from "we need to drop the packet
because we couldn't allocate a skb" to "the hardware dropped the packed
because the FIFO was full."

Yes, I'm intending giving it a go, once I've a spare moment to build
a kernel for the platform etc.  It runs root NFS, so should be a good
test for it.

-- 
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