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vlib: improvement to automatic core pinning

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Type: feature

If 'main-core' is not specified, the main thread is pinned
by default to the cpu it is running on during initialization.
This change does not impact manual core-pinning, which
requires the 'main-core' argument
e.g. 'cpu {main-core x corelist-workers n}.

Change-Id: I874034591bf0acf4d71b231dfbbb0f6de8fe6060
Signed-off-by: hsandid <halsandi@cisco.com>
This commit is contained in:
hsandid
2024-05-22 15:30:24 +02:00
committed by Damjan Marion
parent 1b053782a5
commit 0b0468cb0f
2 changed files with 13 additions and 0 deletions
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9
src/vlib/threads.c
View File

@ -205,6 +205,10 @@ vlib_thread_init (vlib_main_t * vm)
avail_cpu = clib_bitmap_set (avail_cpu, c, 0);
}
/* if main thread affinity is unspecified, set to current running cpu */
if (tm->main_lcore == ~0)
tm->main_lcore = sched_getcpu ();
/* grab cpu for main thread */
if (tm->main_lcore != ~0)
{
@ -1134,6 +1138,7 @@ cpu_config (vlib_main_t * vm, unformat_input_t * input)
u8 *name;
uword *bitmap;
u32 count;
int use_corelist = 0;
tm->thread_registrations_by_name = hash_create_string (0, sizeof (uword));
@ -1185,6 +1190,7 @@ cpu_config (vlib_main_t * vm, unformat_input_t * input)
tr->coremask = bitmap;
tr->count = clib_bitmap_count_set_bits (tr->coremask);
use_corelist = 1;
}
else
if (unformat
@ -1214,6 +1220,9 @@ cpu_config (vlib_main_t * vm, unformat_input_t * input)
break;
}
if (use_corelist && tm->main_lcore == ~0)
return clib_error_return (0, "main-core must be specified when using "
"corelist-* or coremask-* attribute");
if (tm->sched_priority != ~0)
{
if (tm->sched_policy == SCHED_FIFO || tm->sched_policy == SCHED_RR)

4
src/vpp/vnet/main.c
View File

@ -329,6 +329,10 @@ defaulted:
unformat_free (&input);
/* if main thread affinity is unspecified, set to current running cpu */
if (main_core == ~0)
main_core = sched_getcpu ();
/* set process affinity for main thread */
if (main_core != ~0)
{