Re: [dpdk-dev] [PATCH v5 5/5] test/thash: add performance tests for the Toeplitz hash

[Thomas Monjalon <thomas@monjalon.net>]

26/10/2021 22:29, Medvedkin, Vladimir:
> Hi Thomas,
> 
> Thanks for the review, I'll address your comments in v6.
> Please find my comment below
> 
> On 25/10/2021 19:02, Thomas Monjalon wrote:
> > 21/10/2021 20:54, Vladimir Medvedkin:
> >> This patch adds performance tests for different implementations
> >> of the Toeplitz hash function.
> > 
> > Please name them.
> > 
> >> Signed-off-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>
> > 
> > There are some garbage,
> > 
> >> @@ -320,6 +321,7 @@ perf_test_names = [
> >>           'hash_readwrite_lf_perf_autotest',
> >>           'trace_perf_autotest',
> >>           'ipsec_perf_autotest',
> >> +	'thash_perf_autotest',
> > 
> > here (tabs instead of space)
> > 
> >>   driver_test_names = [
> >> diff --git a/app/test/test_thash_perf.c b/app/test/test_thash_perf.c
> >> new file mode 100644
> >> index 0000000..fb66e20
> >> --- /dev/null
> >> +++ b/app/test/test_thash_perf.c
> >> @@ -0,0 +1,120 @@
> >> +/* SPDX-License-Identifier: BSD-3-Clause
> >> + * Copyright(c) 2021 Intel Corporation
> >> + */
> >> +
> >> +#include <stdio.h>
> >> +#include <stdint.h>
> >> +#include <stdlib.h>
> >> +#include <math.h>
> >> +
> >> +#include <rte_cycles.h>
> >> +#include <rte_malloc.h>
> >> +#include <rte_random.h>
> >> +#include <rte_thash.h>
> >> +
> >> +#include "test.h"
> >> +
> >> +#define ITERATIONS	(1 << 15)
> >> +#define	BATCH_SZ	(1 << 10)
> >> +
> >> +#define IPV4_2_TUPLE_LEN	(8)
> >> +#define IPV4_4_TUPLE_LEN	(12)
> >> +#define IPV6_2_TUPLE_LEN	(32)
> >> +#define IPV6_4_TUPLE_LEN	(36)
> >> +
> >> +
> >> +static uint8_t default_rss_key[] = {
> >> +	0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
> >> +	0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
> >> +	0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
> >> +	0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
> >> +	0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa,
> >> +};
> >> +
> >> +static void
> >> +run_thash_test(unsigned int tuple_len)
> >> +{
> >> +	uint32_t *tuples[BATCH_SZ];
> >> +	unsigned int i, j;
> >> +	uint64_t start_tsc, end_tsc;
> >> +	uint32_t len = RTE_ALIGN_CEIL(tuple_len, sizeof(uint32_t));
> >> +	volatile uint32_t hash = 0;
> >> +	uint32_t bulk_hash[BATCH_SZ] = { 0 };
> >> +
> >> +	for (i = 0; i < BATCH_SZ; i++) {
> >> +		tuples[i] = rte_zmalloc(NULL, len, 0);
> >> +		for (j = 0; j < len / sizeof(uint32_t); j++)
> >> +			tuples[i][j] = rte_rand();
> >> +	}
> >> +
> >> +	start_tsc = rte_rdtsc_precise();
> >> +	for (i = 0; i < ITERATIONS; i++) {
> >> +		for (j = 0; j < BATCH_SZ; j++) {
> >> +			hash ^= rte_softrss(tuples[j], len / sizeof(uint32_t),
> >> +				default_rss_key);
> >> +		}
> >> +	}
> >> +	end_tsc = rte_rdtsc_precise();
> >> +
> >> +	printf("Average rte_softrss() takes \t\t%.1f cycles for key len %d\n",
> >> +		(double)(end_tsc - start_tsc) / (double)(ITERATIONS *
> >> +		BATCH_SZ), len);
> >> +
> >> +	start_tsc = rte_rdtsc_precise();
> >> +	for (i = 0; i < ITERATIONS; i++) {
> >> +		for (j = 0; j < BATCH_SZ; j++) {
> >> +			hash ^= rte_softrss_be(tuples[j], len /
> >> +				sizeof(uint32_t), default_rss_key);
> >> +		}
> >> +	}
> >> +	end_tsc = rte_rdtsc_precise();
> >> +
> >> +	printf("Average rte_softrss_be() takes \t\t%.1f cycles for key len %d\n",
> >> +		(double)(end_tsc - start_tsc) / (double)(ITERATIONS *
> >> +		BATCH_SZ), len);
> > 
> > The function could stop here (one function per type of implementation).
> > 
> 
> Could you please clarify what do you mean?
> The function stops here if the machine do not support GFNI, and this is 
> done intentionally. On machine without GFNI it tests only scalar 
> implementations for every given length.

No I mean you can split in smaller functions.

> >> +
> >> +	if (!rte_thash_gfni_supported())
> >> +		return;
> >> +
> >> +	uint64_t rss_key_matrixes[RTE_DIM(default_rss_key)];
> >> +
> >> +	rte_thash_complete_matrix(rss_key_matrixes, default_rss_key,
> >> +		RTE_DIM(default_rss_key));
> >> +
> >> +	start_tsc = rte_rdtsc_precise();
> >> +	for (i = 0; i < ITERATIONS; i++) {
> >> +		for (j = 0; j < BATCH_SZ; j++)
> >> +			hash ^= rte_thash_gfni(rss_key_matrixes,
> >> +				(uint8_t *)tuples[j], len);
> >> +	}
> >> +	end_tsc = rte_rdtsc_precise();
> >> +
> >> +	printf("Average rte_thash_gfni takes \t\t%.1f cycles for key len %d\n",
> >> +		(double)(end_tsc - start_tsc) / (double)(ITERATIONS *
> >> +		BATCH_SZ), len);
> >> +
> >> +	start_tsc = rte_rdtsc_precise();
> >> +	for (i = 0; i < ITERATIONS; i++)
> >> +		rte_thash_gfni_bulk(rss_key_matrixes, len, (uint8_t **)tuples,
> >> +			bulk_hash, BATCH_SZ);
> >> +
> >> +	end_tsc = rte_rdtsc_precise();
> >> +
> >> +	printf("Average rte_thash_gfni_x2 takes \t%.1f cycles for key len %d\n",
> > 
> > and here, the function name is not updated.
> > 
> >> +		(double)(end_tsc - start_tsc) / (double)(ITERATIONS *
> >> +		BATCH_SZ), len);
> >> +
> > 
> > useless blank line
> > 
> >> +}