target/linux/layerscape/patches-5.4/701-net-0083-sdk_dpaa-ceetm-lower-the-default-congestion-threshol.patch

   1 From c18056f0a2648457cdaf06450addd217091f4bea Mon Sep 17 00:00:00 2001
   2 From: Camelia Groza <camelia.groza@nxp.com>
   3 Date: Tue, 2 Oct 2018 16:49:28 +0300
   4 Subject: [PATCH] sdk_dpaa: ceetm: lower the default congestion thresholds
   5
   6 The congestion thresholds need to be set in such a way that:
   7     a) the threshold is high enough so that frames aren't dropped
   8     unnecessarily
   9     b) the threshold is low enough so that the latency isn't too big
  10
  11 The current thresholds are set too high. In forwarding scenarios, the
  12 latency is too large and frames are dropped on ingress due to a lack of
  13 buffers.
  14
  15 Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
  16 ---
  17  drivers/net/ethernet/freescale/sdk_dpaa/Kconfig | 4 ++--
  18  1 file changed, 2 insertions(+), 2 deletions(-)
  19
  20 --- a/drivers/net/ethernet/freescale/sdk_dpaa/Kconfig
  21 +++ b/drivers/net/ethernet/freescale/sdk_dpaa/Kconfig
  22 @@ -24,7 +24,7 @@ config FSL_DPAA_CEETM_CCS_THRESHOLD_1G
  23         hex "CEETM egress congestion threshold on 1G ports"
  24         depends on FSL_DPAA_CEETM
  25         range 0x1000 0x10000000
  26 -       default "0x000a0000"
  27 +       default "0x00005000"
  28         help
  29           The size in bytes of the CEETM egress Class Congestion State threshold on 1G ports.
  30           The threshold needs to be configured keeping in mind the following factors:
  31 @@ -38,7 +38,7 @@ config FSL_DPAA_CEETM_CCS_THRESHOLD_10G
  32         hex "CEETM egress congestion threshold on 10G ports"
  33         depends on FSL_DPAA_CEETM
  34         range 0x1000 0x20000000
  35 -       default "0x00640000"
  36 +       default "0x00032000"
  37         help
  38           The size in bytes of the CEETM egress Class Congestion State threshold on 10G ports.
  39           See FSL_DPAA_CEETM_CCS_THRESHOLD_1G for details.