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Date:   Sat, 14 Dec 2019 18:05:09 -0800
From:   Jakub Kicinski <>
To:     Willem de Bruijn <>
        Willem de Bruijn <>,
        Naresh Kamboju <>
Subject: Re: [PATCH net-next] selftests/net: make so_txtime more robust to
 timer variance

On Thu, 12 Dec 2019 11:36:46 -0500, Willem de Bruijn wrote:
> From: Willem de Bruijn <>
> The SO_TXTIME test depends on accurate timers. In some virtualized
> environments the test has been reported to be flaky. This is easily
> reproduced by disabling kvm acceleration in Qemu.
> Allow greater variance in a run and retry to further reduce flakiness.
> Observed errors are one of two kinds: either the packet arrives too
> early or late at recv(), or it was dropped in the qdisc itself and the
> recv() call times out.
> In the latter case, the qdisc queues a notification to the error
> queue of the send socket. Also explicitly report this cause.
> Link:
> Reported-by: Naresh Kamboju <>
> Signed-off-by: Willem de Bruijn <>

Applied, thank you!

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