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From: Simon Horman <horms@kernel.org>
To: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Cc: netdev@vger.kernel.org, davem@davemloft.net, kuba@kernel.org,
	edumazet@google.com, pabeni@redhat.com,
	linux-kselftest@vger.kernel.org,
	Willem de Bruijn <willemb@google.com>
Subject: Re: [PATCH net-next] selftests/net: calibrate txtimestamp
Date: Tue, 30 Jan 2024 15:54:11 +0100	[thread overview]
Message-ID: <20240130145411.GK351311@kernel.org> (raw)
In-Reply-To: <20240127023212.3746239-1-willemdebruijn.kernel@gmail.com>

On Fri, Jan 26, 2024 at 09:31:51PM -0500, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@google.com>
> 
> The test sends packets and compares enqueue, transmit and Ack
> timestamps with expected values. It installs netem delays to increase
> latency between these points.
> 
> The test proves flaky in virtual environment (vng). Increase the
> delays to reduce variance. Scale measurement tolerance accordingly.
> 
> Time sensitive tests are difficult to calibrate. Increasing delays 10x
> also increases runtime 10x, for one. And it may still prove flaky at
> some rate.
> 
> Signed-off-by: Willem de Bruijn <willemb@google.com>

Reviewed-by: Simon Horman <horms@kernel.org>


  reply	other threads:[~2024-01-30 14:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-01-27  2:31 [PATCH net-next] selftests/net: calibrate txtimestamp Willem de Bruijn
2024-01-30 14:54 ` Simon Horman [this message]
2024-01-31  1:47 ` Jakub Kicinski
2024-01-31 15:06   ` Willem de Bruijn
2024-01-31 18:29     ` Jakub Kicinski
2024-01-31 20:27       ` Willem de Bruijn
2024-01-31 20:58         ` Jakub Kicinski
2024-01-31 21:20           ` Willem de Bruijn
2024-01-31 18:39     ` Paolo Abeni
2024-01-31 18:40 ` patchwork-bot+netdevbpf

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