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71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/** Latency benchmarks.
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*
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2017-2022, Steffen Vogel
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* @license GNU General Public License (version 3)
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*
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* VILLASfpga
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#include <stdio.h>
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#include <villas/log.h>
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#include <villas/utils.hpp>
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#include <villas/fpga/card.h>
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#include <villas/fpga/ip.h>
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#include "bench.h"
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int fpga_benchmark_latency(struct fpga_card *c)
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{
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int ret;
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uint64_t start, end;
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if (!c->intc)
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return -1;
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int runs = 1000000;
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int hist[runs];
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ret = intc_enable(c->intc, 0x100, intc_flags);
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if (ret)
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error("Failed to enable interrupts");
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for (int i = 0; i < runs; i++) {
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start = rdtsc();
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XIntc_Out32((uintptr_t) c->map + c->intc->baseaddr + XIN_ISR_OFFSET, 0x100);
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intc_wait(c->intc, 8);
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end = rdtsc();
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hist[i] = end - start;
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}
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char fn[256];
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snprintf(fn, sizeof(fn), "results/latency_%s_%s.dat", intc_flags & INTC_POLLING ? "polling" : "irq", uts.release);
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FILE *g = fopen(fn, "w");
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for (int i = 0; i < runs; i++)
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fprintf(g, "%u\n", hist[i]);
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fclose(g);
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ret = intc_disable(c->intc, 0x100);
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if (ret)
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error("Failed to disable interrupt");
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return 0;
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}
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