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zarubaf avatar zarubaf commented on September 16, 2024

@fischeti as you are looking into the performance counters at the moment would you mind also tackling that issue? Thanks!

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fischeti avatar fischeti commented on September 16, 2024

Sure 👍

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fischeti avatar fischeti commented on September 16, 2024

snitch/hw/ip/snitch_dma/src/axi_dma_pkg.sv

Lines 13 to 23 in ca929ad

typedef struct packed {
logic [63:0] aw_stall_cnt, ar_stall_cnt, r_stall_cnt, w_stall_cnt,
buf_w_stall_cnt, buf_r_stall_cnt;
logic [63:0] aw_valid_cnt, aw_ready_cnt, aw_done_cnt, aw_bw;
logic [63:0] ar_valid_cnt, ar_ready_cnt, ar_done_cnt, ar_bw;
logic [63:0] r_valid_cnt, r_ready_cnt, r_done_cnt, r_bw;
logic [63:0] w_valid_cnt, w_ready_cnt, w_done_cnt, w_bw;
logic [63:0] b_valid_cnt, b_ready_cnt, b_done_cnt;
logic [63:0] next_id, completed_id;
logic [63:0] dma_busy_cnt;
} dma_perf_t;

Those are quite a lot of and big counters. I guess the idea is not to synthesize them but connect them to the performance counter in an event-based style, right?

For example as in :

snitch/hw/ip/snitch_cluster/src/snitch_cluster_peripheral/snitch_cluster_peripheral.sv

Lines 92 to 95 in be56227

// TCDM Congested
if (reg2hw.perf_counter_enable[i].tcdm_congested.q) begin
perf_counter_d[i] = perf_counter_d[i] + tcdm_events_q.inc_congested;
end

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zarubaf avatar zarubaf commented on September 16, 2024

Yes exactly! We didn't have them before but now that have this event selector notion I think we can add them as they shouldn't come with significant overhead.

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