netdev - Re: [Intel-wired-lan] [PATCH iwl-net v1 1/5] igc: Ensure the PTM cycle is reliably triggered

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Message-ID: <ZrOdthE36RQy78fx@calimero.vinschen.de>
Date: Wed, 7 Aug 2024 18:15:50 +0200
From: Corinna Vinschen <vinschen@...hat.com>
To: christopher.s.hall@...el.com
Cc: intel-wired-lan@...ts.osuosl.org, david.zage@...el.com,
	vinicius.gomes@...el.com, netdev@...r.kernel.org,
	Michal Swiatkowski <michal.swiatkowski@...ux.intel.com>,
	rodrigo.cadore@...coustics.com
Subject: Re: [Intel-wired-lan] [PATCH iwl-net v1 1/5] igc: Ensure the PTM
 cycle is reliably triggered

Hi Christopher,

On Aug  6 17:30, christopher.s.hall@...el.com wrote:
> From: Christopher S M Hall <christopher.s.hall@...el.com>
> 
> Writing to clear the PTM status 'valid' bit while the PTM cycle is
> triggered results in unreliable PTM operation. To fix this, clear the
> PTM 'trigger' and status after each PTM transaction.
> 
> The issue can be reproduced with the following:
> 
> $ sudo phc2sys -R 1000 -O 0 -i tsn0 -m
> 
> Note: 1000 Hz (-R 1000) is unrealistically large, but provides a way to
> quickly reproduce the issue.
> 
> PHC2SYS exits with:
> 
> "ioctl PTP_OFFSET_PRECISE: Connection timed out" when the PTM transaction
>   fails

It would be great to add the problems encountered with kdump to the
commit message as well, as discussed with Vinicius, wouldn't it?

If you need a description, I can provide one.


Thanks,
Corinna