From: "naamax.meir" <naamax.meir@linux.intel.com>
To: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>,
intel-wired-lan@osuosl.org
Cc: pmenzel@molgen.mpg.de
Subject: Re: [Intel-wired-lan] [PATCH v3] igc: Correct the launchtime offset
Date: Sun, 2 Oct 2022 10:20:50 +0300 [thread overview]
Message-ID: <71edf233-f098-aa02-aadb-05ff59db9b8c@linux.intel.com> (raw)
In-Reply-To: <20220921024940.2128-1-muhammad.husaini.zulkifli@intel.com>
On 9/21/2022 05:49, Muhammad Husaini Zulkifli wrote:
> The launchtime offset should be corrected according to sections 7.5.2.6
> Transmit Scheduling Latency of the Intel Ethernet I225/I226 Software
> User Manual.
>
> Software can compensate the latency between the transmission scheduling
> and the time that packet is transmitted to the network by setting this
> GTxOffset register. Without setting this register, there may be a
> significant delay between the packet scheduling and the network point.
>
> This patch helps to reduce the latency for each of the link speed.
>
> Before:
>
> 10Mbps : 11000 - 13800 nanosecond
> 100Mbps : 1300 - 1700 nanosecond
> 1000Mbps : 190 - 600 nanosecond
> 2500Mbps : 1400 - 1700 nanosecond
>
> After:
>
> 10Mbps : less than 750 nanosecond
> 100Mbps : less than 192 nanosecond
> 1000Mbps : less than 128 nanosecond
> 2500Mbps : less than 128 nanosecond
>
> Test Setup:
>
> Talker : Use l2_tai.c to generate the launchtime into packet payload.
> Listener: Use timedump.c to compute the delta between packet arrival and
> LaunchTime packet payload.
>
> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
> ---
> drivers/net/ethernet/intel/igc/igc_defines.h | 9 ++++++
> drivers/net/ethernet/intel/igc/igc_main.c | 6 ++++
> drivers/net/ethernet/intel/igc/igc_regs.h | 1 +
> drivers/net/ethernet/intel/igc/igc_tsn.c | 30 ++++++++++++++++++++
> drivers/net/ethernet/intel/igc/igc_tsn.h | 1 +
> 5 files changed, 47 insertions(+)
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
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prev parent reply other threads:[~2022-10-02 7:21 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-21 2:49 [Intel-wired-lan] [PATCH v3] igc: Correct the launchtime offset Muhammad Husaini Zulkifli
2022-09-21 8:05 ` Neftin, Sasha
2022-09-21 8:33 ` Paul Menzel
2022-09-21 11:57 ` Zulkifli, Muhammad Husaini
2022-10-02 7:20 ` naamax.meir [this message]
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