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Subject: RE: [PATCH v3 2/2] net/ice: increase the maximum of RX/TX descriptors
Date: Wed, 30 Oct 2024 17:26:42 +0100
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35E9F855@smartserver.smartshare.dk>
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Thread-Topic: [PATCH v3 2/2] net/ice: increase the maximum of RX/TX descriptors
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References: <20241029124832.224112-1-sismis@cesnet.cz>
 <20241030154256.379249-1-sismis@cesnet.cz>
 <20241030154256.379249-3-sismis@cesnet.cz>
From: =?iso-8859-1?Q?Morten_Br=F8rup?= <mb@smartsharesystems.com>
To: "Lukas Sismis" <sismis@cesnet.cz>,
	<dev@dpdk.org>
Cc: <stephen@networkplumber.org>, <anatoly.burakov@intel.com>,
 <ian.stokes@intel.com>, "Bruce Richardson" <bruce.richardson@intel.com>
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> From: Lukas Sismis [mailto:sismis@cesnet.cz]
> Sent: Wednesday, 30 October 2024 16.43
>=20
> Intel PMDs are capped by default to only 4096 RX/TX descriptors.
> This can be limiting for applications requiring a bigger buffer
> capabilities. By bufferring more packets with RX/TX
> descriptors, the applications can better handle the processing
> peaks.
>=20
> Setting ice max descriptors to 8192 - 32 as per datasheet:
> Register name: QLEN (Rx-Queue)
> Description: Receive Queue Length
> Defines the size of the descriptor queue in descriptors units
> from eight descriptors (QLEN=3D0x8) up to 8K descriptors minus
> 32 (QLEN=3D0x1FE0).
> QLEN Restrictions: When the PXE_MODE flag in the
> GLLAN_RCTL_0 register is cleared, the QLEN must be whole
> number of 32 descriptors. When the PXE_MODE flag is set, the
> QLEN can be one of the following options:
> Up to 4 PFs, QLEN can be set to: 8, 16, 24 or 32 descriptors.
> Up to 8 PFs, QLEN can be set to: 8 or 16 descriptors
>=20
> Signed-off-by: Lukas Sismis <sismis@cesnet.cz>
> ---

Drivers should reflect hardware capabilities; it's not up to the driver =
to impose artificial limits on applications. Thank you for fixing this, =
Lukas.

Acked-by: Morten Br=F8rup <mb@smartsharesystems.com>