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Re: NFS corruption, fixed by echo 1 > /proc/sys/vm/drop_caches -- next d

from [Eric Dumazet] [Permanent Link][Original]
To: Matt Turner <mattst88@gmail.com>
Subject: Re: NFS corruption, fixed by echo 1 > /proc/sys/vm/drop_caches -- next debugging steps?
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Fri, 08 Dec 2017 13:16:21 -0800
Cc: Eric Dumazet <edumazet@google.com>, "linux-mips@linux-mips.org" <linux-mips@linux-mips.org>, linux-nfs@vger.kernel.org, Paolo Abeni <pabeni@redhat.com>, Hannes Frederic Sowa <hannes@stressinduktion.org>, "Peter Zijlstra (Intel)" <peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@kernel.org>, Manuel Lauss <manuel.lauss@gmail.com>, LKML <linux-kernel@vger.kernel.org>, netdev <netdev@vger.kernel.org>
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On Fri, 2017-12-08 at 12:26 -0800, Matt Turner wrote:
> 
> Thanks for the quick reply!
> 
> I tried the patch on top of master, but unfortunately the corruption
> still occurs.

You might try replacing in sbdma_add_rcvbuffer()

sb_new = netdev_alloc_skb(dev, size);

by 

sb_new = alloc_skb(size, GFP_ATOMIC);

Maybe the device does not like having a frame spanning 2 pages.
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