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Modify Lifespan Checktime

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Make the time, at which the Lifespan of samples is checked dependant on
the actual Lifespans. This should prevent unnecessary memory bandwidth
waste.
This commit is contained in:
Greek 2021-02-02 23:07:34 +01:00
parent bcaace1b8c
commit 5b8206d539
1 changed files with 24 additions and 6 deletions
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30
src/dds_reader.vhd
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@ -269,6 +269,8 @@ architecture arch of dds_reader is
signal key_hash, key_hash_next : KEY_HASH_TYPE := (others => (others => '0'));
-- Source Timestamp Latch
signal ts_latch, ts_latch_next : TIME_TYPE := TIME_INVALID;
-- Lifespan Latch
signal lifespan, lifespan_next : TIME_TYPE := TIME_INVALID;
-- Sample Status Info Latch
signal sample_status_info, sample_status_info_next : std_logic_vector(CDR_LONG_WIDTH-1 downto 0) := (others => '0');
-- General Purpose Payload Pointer
@ -611,6 +613,7 @@ begin
is_lifespan_check_next <= is_lifespan_check;
status_sig_next <= status_sig;
cnt2_next <= cnt2;
lifespan_next <= lifespan;
-- DEFAULT Unregistered
inst_opcode <= NOP;
res_rtps <= UNDEFINED;
@ -662,7 +665,7 @@ begin
-- LIFESPAN QoS
elsif (lifespan_time <= time) then
-- Reset Timeout
lifespan_time_next <= time + TODO;
lifespan_time_next <= TIME_INFINITE;
-- Samples Available
if (oldest_sample /= SAMPLE_MEMORY_MAX_ADDRESS) then
@ -879,11 +882,13 @@ begin
end if;
end if;
end if;
-- Lifespane Deadline 1/2
-- Lifespan Deadline 1/2
when 3 =>
sample_valid_in <= '1';
sample_addr <= cur_sample + SMF_LIFESPAN_DEADLINE_OFFSET;
sample_write_data <= data_in_rtps;
-- Latch Lifespan
lifespan_next(0) <= data_in_rtps;
-- Memory Flow Control Guard
if (sample_ready_in = '1') then
ready_in_rtps <= '1';
@ -894,6 +899,8 @@ begin
sample_valid_in <= '1';
sample_addr <= cur_sample + SMF_LIFESPAN_DEADLINE_OFFSET + 1;
sample_write_data <= data_in_rtps;
-- Latch Lifespan
lifespan_next(1) <= data_in_rtps;
-- Memory Flow Control Guard
if (sample_ready_in = '1') then
ready_in_rtps <= '1';
@ -1661,6 +1668,11 @@ begin
-- Signal Data Available
status_sig_next(DATA_AVAILABLE_STATUS) <= '1';
-- Update Lifespan Check Time
if (lifespan /= TIME_INVALID and lifespan < lifespan_time) then
lifespan_next <= lifespan;
end if;
-- NOTE: added_new_instance and remove_oldest_sample are NOT mutual exclusive, but Instance Removal takes precedence.
-- New Instance was added, and Instance Memory is Full
@ -3236,17 +3248,23 @@ begin
-- Sample Lifespan Expired
if (tmp_dw /= TIME_INVALID and time >= tmp_dw) then
-- Remove Sample
stage_next <= REMOVE_SAMPLE;
cnt_next <= 0;
stage_next <= REMOVE_SAMPLE;
cnt_next <= 0;
else
-- Update Check Time
if (tmp_dw /= TIME_INVALID and tmp_dw < lifespan_time) then
lifespan_time_next <= tmp_dw;
end if;
-- Reached End of Samples
if (next_sample = SAMPLE_MEMORY_MAX_ADDRESS) then
-- DONE
stage_next <= IDLE;
else
-- Continue Search
cur_sample_next <= next_sample;
cnt_next <= 0;
cur_sample_next <= next_sample;
cnt_next <= 0;
end if;
end if;
end if;