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SubjectRe: [PATCH RFC net-next 06/19] net: mvpp2: increase BM pool size to 2048 buffers
On Sun, Jan 10, 2021 at 05:30:10PM +0200, stefanc@marvell.com wrote:
> From: Stefan Chulski <stefanc@marvell.com>
>
> BM pool size increased to support Firmware Flow Control.
> Minimum depletion thresholds to support FC is 1024 buffers.
> BM pool size increased to 2048 to have some 1024 buffers
> space between depletion thresholds and BM pool size.
>
> Signed-off-by: Stefan Chulski <stefanc@marvell.com>
> ---
> drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> index 89b3ede..8dc669d 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2.h
> @@ -851,8 +851,8 @@ enum mvpp22_ptp_packet_format {
> #define MVPP22_PTP_TIMESTAMPQUEUESELECT BIT(18)
>
> /* BM constants */
> -#define MVPP2_BM_JUMBO_BUF_NUM 512
> -#define MVPP2_BM_LONG_BUF_NUM 1024
> +#define MVPP2_BM_JUMBO_BUF_NUM 2048
> +#define MVPP2_BM_LONG_BUF_NUM 2048

Hi Stefan

Jumbo used to be 1/2 of regular. Do you know why?

It would be nice to have a comment in the commit message about why it
is O.K. to change the ratio of jumbo to regular frames, and what if
anything this does for memory requirements.

Andrew


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