linux-kernel - Re: [Intel-wired-lan] [PATCH iwl-net v2] igc: Reduce TSN TX packet buffer from 7KB to 5KB per queue

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Message-ID: <38f70791-56b6-4795-876d-b84df289dbd8@intel.com>
Date: Mon, 29 Dec 2025 16:53:38 +0200
From: Avigail Dahan <Avigailx.dahan@...el.com>
To: Chwee-Lin Choong <chwee.lin.choong@...el.com>, Tony Nguyen
	<anthony.l.nguyen@...el.com>, Przemek Kitszel <przemyslaw.kitszel@...el.com>,
	Andrew Lunn <andrew+netdev@...n.ch>, "David S . Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>
CC: <intel-wired-lan@...ts.osuosl.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Zdenek Bouska <zdenek.bouska@...mens.com>,
	Faizal Rahim <faizal.abdul.rahim@...ux.intel.com>, Aleksandr Loktionov
	<aleksandr.loktionov@...el.com>, Paul Menzel <pmenzel@...gen.mpg.de>, "Simon
 Horman" <horms@...nel.org>
Subject: Re: [Intel-wired-lan] [PATCH iwl-net v2] igc: Reduce TSN TX packet
 buffer from 7KB to 5KB per queue



On 04/12/2025 14:21, Chwee-Lin Choong wrote:
> The previous 7 KB per queue caused TX unit hangs under heavy
> timestamping load. Reducing to 5 KB avoids these hangs and matches
> the TSN recommendation in I225/I226 SW User Manual Section 7.5.4.
> 
> The 8 KB “freed” by this change is currently unused. This reduction
> is not expected to impact throughput, as the i226 is PCIe-limited
> for small TSN packets rather than TX-buffer-limited.
> 
> Fixes: 0d58cdc902da ("igc: optimize TX packet buffer utilization for TSN mode")
> Reported-by: Zdenek Bouska <zdenek.bouska@...mens.com>
> Closes: https://lore.kernel.org/netdev/AS1PR10MB5675DBFE7CE5F2A9336ABFA4EBEAA@AS1PR10MB5675.EURPRD10.PROD.OUTLOOK.COM/
> Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>
> Reviewed-by: Simon Horman <horms@...nel.org>
> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
> Signed-off-by: Chwee-Lin Choong <chwee.lin.choong@...el.com>
> ---
> v1: https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20250918183811.31270-1-chwee.lin.choong@intel.com/
> 
> changelog:
> v1 -> v2
> - Elaborated commit message
> ---
>   drivers/net/ethernet/intel/igc/igc_defines.h | 5 +++--
>   1 file changed, 3 insertions(+), 2 deletions(-)
> 

Tested-by: Avigail Dahan <avigailx.dahan@...el.com>