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authorFlorin Coras <fcoras@cisco.com>2020-07-31 12:32:40 -0700
committerFlorin Coras <florin.coras@gmail.com>2020-08-03 15:36:32 +0000
commiteedc74b804a955de39e013f14c97f2abb4770157 (patch)
tree6c9e640858a6f4b548c67ae8d2f97e9d69fdab47 /test/test_bier.py
parentf3ae9e32664ccc3ce0980fcafee9453a3c0cef9b (diff)
tcp: improve timestamp rtt accuracy
- switch to using vlib_time as reference for timestamps - use us precision ticks for tcp but keep using ms precision for timestamps. As a result, srtt, rttvar and rto are now measured in us instead of ms. MRTT samples from timestamps are converted from ms to us (not accurate under ms) while high precision samples are used with us precision, i.e., they're no longer converted to ms precision samples. Type: improvement Change-Id: Ibda559575d9b4fdc85b0985264f7c865ff367e34 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'test/test_bier.py')
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/*
 *------------------------------------------------------------------
 * persist.c - persistent data structure storage test / demo code
 *
 * Copyright (c) 2013 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *------------------------------------------------------------------
 */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <netinet/in.h>
#include <signal.h>
#include <pthread.h>
#include <unistd.h>
#include <time.h>
#include <fcntl.h>
#include <string.h>
#include <vppinfra/clib.h>
#include <vppinfra/vec.h>
#include <vppinfra/hash.h>
#include <vppinfra/bitmap.h>
#include <vppinfra/fifo.h>
#include <vppinfra/time.h>
#include <vppinfra/mheap.h>
#include <vppinfra/heap.h>
#include <vppinfra/pool.h>
#include <vppinfra/format.h>
#include <vppinfra/serialize.h>
#include <svmdb.h>

typedef struct
{
  svmdb_client_t *c;
} persist_main_t;

persist_main_t persist_main;

typedef struct
{
  u8 *string1;
  u8 *string2;
} demo_struct2_t;

typedef struct
{
  demo_struct2_t *demo2;
  u8 *name;
} demo_struct1_t;

/*
 * Data structures in persistent shared memory, all the time
 */
clib_error_t *
persist_malloc (persist_main_t * pm)
{
  demo_struct2_t *demo2;
  demo_struct1_t *demo1;
  time_t starttime = time (0);
  char *datestring = ctime (&starttime);
  void *oldheap;

  /* Get back the root pointer */
  demo1 = svmdb_local_get_variable_reference
    (pm->c, SVMDB_NAMESPACE_VEC, "demo1_location");

  /* It doesnt exist create our data structures */
  if (demo1 == 0)
    {
      /* If you want MP / thread safety, lock the region... */
      pthread_mutex_lock (&pm->c->db_rp->mutex);

      /* Switch to the shared memory region heap */
      oldheap = svm_push_data_heap (pm->c->db_rp);

      /* Allocate the top-level structure as a single element vector */
      vec_validate (demo1, 0);

      /* Allocate the next-level structure as a plain old memory obj */
      demo2 = clib_mem_alloc (sizeof (*demo2));

      demo1->demo2 = demo2;
      demo1->name = format (0, "My name is Ishmael%c", 0);
      demo2->string1 = format (0, "Here is string1%c", 0);
      demo2->string2 = format (0, "Born at %s%c", datestring, 0);

      /* Back to the process-private heap */
      svm_pop_heap (oldheap);
      pthread_mutex_unlock (&pm->c->db_rp->mutex);

      /*
       * Set the root pointer. Note: this guy switches heaps, locks, etc.
       * We allocated demo1 as a vector to make this "just work..."
       */
      svmdb_local_set_vec_variable (pm->c, "demo1_location",
				    demo1, sizeof (demo1));

    }
  else
    {
      /* retrieve and print data from shared memory */
      demo2 = demo1->demo2;
      fformat (stdout, "name: %s\n", demo1->name);
      fformat (stdout, "demo2 location: %llx\n", demo2);
      fformat (stdout, "string1: %s\n", demo2->string1);
      fformat (stdout, "string2: %s\n", demo2->string2);
    }
  return 0;
}

void
unserialize_demo1 (serialize_main_t * sm, va_list * args)
{
  demo_struct1_t **result = va_arg (*args, demo_struct1_t **);
  demo_struct1_t *demo1;
  demo_struct2_t *demo2;

  /* Allocate data structures in process private memory */
  demo1 = clib_mem_alloc (sizeof (*demo1));
  demo2 = clib_mem_alloc (sizeof (*demo2));
  demo1->demo2 = demo2;

  /* retrieve data from shared memory checkpoint */
  unserialize_cstring (sm, (char **) &demo1->name);
  unserialize_cstring (sm, (char **) &demo2->string1);
  unserialize_cstring (sm, (char **) &demo2->string2);
  *result = demo1;
}

void
serialize_demo1 (serialize_main_t * sm, va_list * args)
{
  demo_struct1_t *demo1 = va_arg (*args, demo_struct1_t *);
  demo_struct2_t *demo2 = demo1->demo2;

  serialize_cstring (sm, (char *) demo1->name);
  serialize_cstring (sm, (char *) demo2->string1);
  serialize_cstring (sm, (char *) demo2->string2);
}

/* Serialize / unserialize variant */
clib_error_t *
persist_serialize (persist_main_t * pm)
{
  u8 *checkpoint;
  serialize_main_t sm;

  demo_struct2_t *demo2;
  demo_struct1_t *demo1;
  time_t starttime = time (0);
  char *datestring = ctime (&starttime);

  /* Get back the root pointer */
  checkpoint = svmdb_local_get_vec_variable (pm->c, "demo1_checkpoint",
					     sizeof (u8));

  /* It doesnt exist create our data structures */
  if (checkpoint == 0)
    {
      /* Allocate data structures in process-private memory */
      demo1 = clib_mem_alloc (sizeof (*demo2));
      vec_validate (demo1, 0);
      demo2 = clib_mem_alloc (sizeof (*demo2));

      demo1->demo2 = demo2;
      demo1->name = format (0, "My name is Ishmael%c", 0);
      demo2->string1 = format (0, "Here is string1%c", 0);
      demo2->string2 = format (0, "Born at %s%c", datestring, 0);

      /* Create checkpoint */
      serialize_open_vector (&sm, checkpoint);
      serialize (&sm, serialize_demo1, demo1);
      checkpoint = serialize_close_vector (&sm);

      /* Copy checkpoint into shared memory */
      svmdb_local_set_vec_variable (pm->c, "demo1_checkpoint",
				    checkpoint, sizeof (u8));
      /* Toss the process-private-memory original.. */
      vec_free (checkpoint);
    }
  else
    {
      /* Open the checkpoint */
      unserialize_open_data (&sm, checkpoint, vec_len (checkpoint));
      unserialize (&sm, unserialize_demo1, &demo1);

      /* Toss the process-private-memory checkpoint copy */
      vec_free (checkpoint);

      /* Off we go... */
      demo2 = demo1->demo2;
      fformat (stdout, "name: %s\n", demo1->name);
      fformat (stdout, "demo2 location: %llx\n", demo2);
      fformat (stdout, "string1: %s\n", demo2->string1);
      fformat (stdout, "string2: %s\n", demo2->string2);
    }
  return 0;
}


int
main (int argc, char **argv)
{
  unformat_input_t _input, *input = &_input;
  persist_main_t *pm = &persist_main;
  clib_error_t *error = 0;

  /* Make a 4mb database arena, chroot so it's truly private */
  pm->c = svmdb_map_chroot_size ("/ptest", 4 << 20);

  ASSERT (pm->c);

  unformat_init_command_line (input, argv);

  while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
    {
      if (unformat (input, "malloc"))
	error = persist_malloc (pm);
      else if (unformat (input, "serialize"))
	error = persist_serialize (pm);
      else
	{
	  error = clib_error_return (0, "Unknown flavor '%U'",
				     format_unformat_error, input);
	  break;
	}
    }

  svmdb_unmap (pm->c);

  if (error)
    {
      clib_error_report (error);
      exit (1);
    }
  return 0;
}

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */