netdev - RE: [next-queue PATCH v1 1/2] igb: Change RXPBSIZE size when setting Qav mode

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Date:   Fri, 30 Nov 2018 03:16:47 +0000
From:   "Brown, Aaron F" <aaron.f.brown@...el.com>
To:     "Gomes, Vinicius" <vinicius.gomes@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "Sanchez-Palencia, Jesus" <jesus.sanchez-palencia@...el.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jesus.s.palencia@...il.com" <jesus.s.palencia@...il.com>
Subject: RE: [next-queue PATCH v1 1/2] igb: Change RXPBSIZE size when
 setting Qav mode

> From: netdev-owner@...r.kernel.org [mailto:netdev-
> owner@...r.kernel.org] On Behalf Of Vinicius Costa Gomes
> Sent: Friday, November 16, 2018 4:19 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Sanchez-Palencia, Jesus <jesus.sanchez-palencia@...el.com>; Kirsher,
> Jeffrey T <jeffrey.t.kirsher@...el.com>; netdev@...r.kernel.org;
> jesus.s.palencia@...il.com
> Subject: [next-queue PATCH v1 1/2] igb: Change RXPBSIZE size when setting
> Qav mode
> 
> From: Jesus Sanchez-Palencia <jesus.sanchez-palencia@...el.com>
> 
> Section 4.5.9 of the datasheet says that the total size of all packet
> buffers combined (TxPB 0 + 1 + 2 + 3 + RxPB + BMC2OS + OS2BMC) must not
> exceed 60KB. Today we are configuring a total of 62KB, so reduce the
> RxPB from 32KB to 30KB in order to respect that.
> 
> The choice of changing RxPBSIZE here is mainly because it seems more
> correct to give more priority to the transmit packet buffers over the
> receiver ones when running in Qav mode. Also, the BMC2OS and OS2BMC
> sizes are already too short.
> 
> Signed-off-by: Jesus Sanchez-Palencia <jesus.s.palencia@...il.com>
> ---
>  drivers/net/ethernet/intel/igb/e1000_defines.h | 1 +
>  drivers/net/ethernet/intel/igb/igb_main.c      | 2 +-
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 

Tested-by: Aaron Brown <aaron.f.brown@...el.com>