netdev - Re: NFS corruption, fixed by echo 1 > /proc/sys/vm/drop

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Date:   Sat, 09 Dec 2017 13:37:02 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Matt Turner <mattst88@...il.com>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        linux-nfs@...r.kernel.org, Paolo Abeni <pabeni@...hat.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Manuel Lauss <manuel.lauss@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: NFS corruption, fixed by echo 1 > /proc/sys/vm/drop_caches --
 next debugging steps?

On Sat, 2017-12-09 at 13:03 -0800, Matt Turner wrote:
> On Fri, Dec 8, 2017 at 1:16 PM, Eric Dumazet <eric.dumazet@...il.com>
> wrote:
> > 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.
> 
> No such luck. I also gave changing the page size from 16K to 4K a
> shot
> without success.


If your hist is SMP, could you try running it with one CPU only ?

Sorry, I have no more ideas :/