netdev - Re: [ISSUE][4.20.6] mlx5 and checksum failures

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Date:   Thu, 7 Feb 2019 10:42:53 -0800
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Ian Kumlien <ian.kumlien@...il.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        David Miller <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [ISSUE][4.20.6] mlx5 and checksum failures

On Thu, Feb 7, 2019 at 2:17 AM Ian Kumlien <ian.kumlien@...il.com> wrote:
>
> On Thu, Feb 7, 2019 at 2:01 AM Saeed Mahameed <saeedm@....mellanox.co.il> wrote:
> > On Wed, Feb 6, 2019 at 3:00 PM Ian Kumlien <ian.kumlien@...il.com> wrote:
> > > It changes directly after the first hw checksum failure, I don't know why =/
> >
> > weird, Maybe a real check-summing issue/corruption on the PCI ?!
>
> Actually, it seems to have been introduced in 4.20.6 - 4.20.5 works just fine
>

Great, the difference is only 120 patches.
that is bisect-able, it will only take 5 iterations to find the
offending commit.


> Just FYI, my dmesg testcase:
> time ssh <server> "dmesg && exit
> real    3m5.845s
> user    0m0.035s
> sys     0m0.041s
>
> > can you try turning off checksum offloads
> > ethtool -K ethX  rx off
>
> same test:
> real    0m3.408s
> user    0m0.022s
> sys     0m0.032s
>
> So yes, something in 4.20.6 goes wrong on the receiving part :/