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[Dynamic buffer][Mellanox] Fix issue: accumulative headroom can exceed limit in rare scenario #2020

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Merged
liat-grozovik merged 1 commit into from
Nov 16, 2021
Merged

[Dynamic buffer][Mellanox] Fix issue: accumulative headroom can exceed limit in rare scenario #2020

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5 changes: 4 additions & 1 deletion cfgmgr/buffer_check_headroom_mellanox.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@ end
-- Initialize the accumulative size with 4096
-- This is to absorb the possible deviation
local accumulative_size = 4096
-- Egress mirror size: 2 * maximum MTU (10k)
local egress_mirror_size = 20*1024

local appl_db = "0"
local state_db = "6"
Expand Down Expand Up @@ -56,8 +58,9 @@ local pipeline_latency = tonumber(redis.call('HGET', asic_keys[1], 'pipeline_lat
if is_port_with_8lanes(lanes) then
-- The pipeline latency should be adjusted accordingly for ports with 2 buffer units
pipeline_latency = pipeline_latency * 2 - 1
egress_mirror_size = egress_mirror_size * 2
end
accumulative_size = accumulative_size + 2 * pipeline_latency * 1024
accumulative_size = accumulative_size + 2 * pipeline_latency * 1024 + egress_mirror_size

-- Fetch all keys in BUFFER_PG according to the port
redis.call('SELECT', appl_db)
Expand Down