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

[Avigail Dahan]

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@xxxxxxxxxxx>
> Closes: https://lore.kernel.org/netdev/AS1PR10MB5675DBFE7CE5F2A9336ABFA4EBEAA@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/
> Reviewed-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
> Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx>
> Signed-off-by: Chwee-Lin Choong <chwee.lin.choong@xxxxxxxxx>
> ---
> v1: https://patchwork.ozlabs.org/project/intel-wired-lan/patch/20250918183811.31270-1-chwee.lin.choong@xxxxxxxxx/
>
> 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@xxxxxxxxx>