diff mbox series

[v6] enhance NUMA affinity heuristic

Message ID 20230425051649.1109428-1-kaisenx.you@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers
Series [v6] enhance NUMA affinity heuristic |

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ci/iol-aarch64-compile-testing success Testing PASS
ci/intel-Functional success Functional PASS

Commit Message

Kaisen You April 25, 2023, 5:16 a.m. UTC 
  Trying to allocate memory on the first detected numa node,it has less
chance to find some memory actually available rather than on the main
lcore numa node (especially when the DPDK application is started only
on one numa node).

Fixes: 8b0a1b8cb481 ("eal: stop using pthread for lcores and control threads")
Fixes: 770d41bf3309 ("malloc: fix allocation with unknown socket ID")
Cc: stable@dpdk.org

Signed-off-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Kaisen You <kaisenx.you@intel.com>

---
Changes since v5:
- Add comments to the code,

Changes since v4:
- mod the patch title,

Changes since v3:
- add the assignment of socket_id in thread initialization,

Changes since v2:
- add uncommitted local change and fix compilation,

Changes since v1:
- accomodate for configurations with main lcore running on multiples
  physical cores belonging to different numa,
---
 lib/eal/common/eal_common_thread.c | 4 ++++
 lib/eal/common/malloc_heap.c       | 6 ++++++
 2 files changed, 10 insertions(+)

Comments

Thomas Monjalon April 27, 2023, 6:57 a.m. UTC | #1 
25/04/2023 07:16, Kaisen You:
> Trying to allocate memory on the first detected numa node,it has less
> chance to find some memory actually available rather than on the main
> lcore numa node (especially when the DPDK application is started only
> on one numa node).

You didn't change the explanations here as discussed previously.

> 
> Fixes: 8b0a1b8cb481 ("eal: stop using pthread for lcores and control threads")
> Fixes: 770d41bf3309 ("malloc: fix allocation with unknown socket ID")
> Cc: stable@dpdk.org
> 
> Signed-off-by: David Marchand <david.marchand@redhat.com>
> Signed-off-by: Kaisen You <kaisenx.you@intel.com>
> 
> ---
> Changes since v5:
> - Add comments to the code,
> 
> Changes since v4:
> - mod the patch title,
> 
> Changes since v3:
> - add the assignment of socket_id in thread initialization,
> 
> Changes since v2:
> - add uncommitted local change and fix compilation,
> 
> Changes since v1:
> - accomodate for configurations with main lcore running on multiples
>   physical cores belonging to different numa,
> ---
>  lib/eal/common/eal_common_thread.c | 4 ++++
>  lib/eal/common/malloc_heap.c       | 6 ++++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/lib/eal/common/eal_common_thread.c b/lib/eal/common/eal_common_thread.c
> index 079a385630..d65bfe251b 100644
> --- a/lib/eal/common/eal_common_thread.c
> +++ b/lib/eal/common/eal_common_thread.c
> @@ -252,6 +252,10 @@ static int ctrl_thread_init(void *arg)
>  	struct rte_thread_ctrl_params *params = arg;
>  
>  	__rte_thread_init(rte_lcore_id(), cpuset);
> +	/* set the value of the per-core variable _socket_id.
> +	 * Convenient for threads to find memory.
> +	 */

That's an useless comment.
We want to know WHY you are setting to SOCKET_ID_ANY.

> +	RTE_PER_LCORE(_socket_id) = SOCKET_ID_ANY;
>  	params->ret = rte_thread_set_affinity_by_id(rte_thread_self(), cpuset);
>  	if (params->ret != 0) {
>  		__atomic_store_n(&params->ctrl_thread_status,
> diff --git a/lib/eal/common/malloc_heap.c b/lib/eal/common/malloc_heap.c
> index d25bdc98f9..a624f08cf7 100644
> --- a/lib/eal/common/malloc_heap.c
> +++ b/lib/eal/common/malloc_heap.c
> @@ -716,6 +716,12 @@ malloc_get_numa_socket(void)
>  		if (conf->socket_mem[socket_id] != 0)
>  			return socket_id;
>  	}
> +	/* Trying to allocate memory on the main lcore numa node.
> +	 * especially when the DPDK application is started only on one numa node.
> +	 */
> +	socket_id = rte_lcore_to_socket_id(rte_get_main_lcore());
> +	if (socket_id != (unsigned int)SOCKET_ID_ANY)
> +		return socket_id;

You should explain why we could reach this point, i.e. SOCKET_ID_ANY.

>  
>  	return rte_socket_id_by_idx(0);
>  }
Kaisen You May 16, 2023, 5:19 a.m. UTC | #2 
> -----Original Message-----
> From: Thomas Monjalon <thomas@monjalon.net>
> Sent: 2023年4月27日 14:58
> To: You, KaisenX <kaisenx.you@intel.com>
> Cc: dev@dpdk.org; Zhou, YidingX <yidingx.zhou@intel.com>;
> david.marchand@redhat.com; Matz, Olivier <olivier.matz@6wind.com>;
> ferruh.yigit@amd.com; Burakov, Anatoly <anatoly.burakov@intel.com>; You,
> KaisenX <kaisenx.you@intel.com>; stable@dpdk.org
> Subject: Re: [PATCH v6] enhance NUMA affinity heuristic
> 
> 25/04/2023 07:16, Kaisen You:
> > Trying to allocate memory on the first detected numa node,it has less
> > chance to find some memory actually available rather than on the main
> > lcore numa node (especially when the DPDK application is started only
> > on one numa node).
> 
> You didn't change the explanations here as discussed previously.
> 
> >
> > Fixes: 8b0a1b8cb481 ("eal: stop using pthread for lcores and control
> > threads")
> > Fixes: 770d41bf3309 ("malloc: fix allocation with unknown socket ID")
> > Cc: stable@dpdk.org
> >
> > Signed-off-by: David Marchand <david.marchand@redhat.com>
> > Signed-off-by: Kaisen You <kaisenx.you@intel.com>
> >
> > ---
> > Changes since v5:
> > - Add comments to the code,
> >
> > Changes since v4:
> > - mod the patch title,
> >
> > Changes since v3:
> > - add the assignment of socket_id in thread initialization,
> >
> > Changes since v2:
> > - add uncommitted local change and fix compilation,
> >
> > Changes since v1:
> > - accomodate for configurations with main lcore running on multiples
> >   physical cores belonging to different numa,
> > ---
> >  lib/eal/common/eal_common_thread.c | 4 ++++
> >  lib/eal/common/malloc_heap.c       | 6 ++++++
> >  2 files changed, 10 insertions(+)
> >
> > diff --git a/lib/eal/common/eal_common_thread.c
> > b/lib/eal/common/eal_common_thread.c
> > index 079a385630..d65bfe251b 100644
> > --- a/lib/eal/common/eal_common_thread.c
> > +++ b/lib/eal/common/eal_common_thread.c
> > @@ -252,6 +252,10 @@ static int ctrl_thread_init(void *arg)
> >  	struct rte_thread_ctrl_params *params = arg;
> >
> >  	__rte_thread_init(rte_lcore_id(), cpuset);
> > +	/* set the value of the per-core variable _socket_id.
> > +	 * Convenient for threads to find memory.
> > +	 */
> 
> That's an useless comment.
> We want to know WHY you are setting to SOCKET_ID_ANY.
> 
> > +	RTE_PER_LCORE(_socket_id) = SOCKET_ID_ANY;
> >  	params->ret = rte_thread_set_affinity_by_id(rte_thread_self(),
> cpuset);
> >  	if (params->ret != 0) {
> >  		__atomic_store_n(&params->ctrl_thread_status,
> > diff --git a/lib/eal/common/malloc_heap.c
> > b/lib/eal/common/malloc_heap.c index d25bdc98f9..a624f08cf7 100644
> > --- a/lib/eal/common/malloc_heap.c
> > +++ b/lib/eal/common/malloc_heap.c
> > @@ -716,6 +716,12 @@ malloc_get_numa_socket(void)
> >  		if (conf->socket_mem[socket_id] != 0)
> >  			return socket_id;
> >  	}
> > +	/* Trying to allocate memory on the main lcore numa node.
> > +	 * especially when the DPDK application is started only on one numa
> node.
> > +	 */
> > +	socket_id = rte_lcore_to_socket_id(rte_get_main_lcore());
> > +	if (socket_id != (unsigned int)SOCKET_ID_ANY)
> > +		return socket_id;
> 
> You should explain why we could reach this point, i.e. SOCKET_ID_ANY.

I'm sorry I didn't reply to you in time due to COVID-19 infection, I will send the v7 
version as soon as possible to fix the problem you mentioned.
> 
> >
> >  	return rte_socket_id_by_idx(0);
> >  }
> 
>
diff mbox series

Patch

diff --git a/lib/eal/common/eal_common_thread.c b/lib/eal/common/eal_common_thread.c
index 079a385630..d65bfe251b 100644
--- a/lib/eal/common/eal_common_thread.c
+++ b/lib/eal/common/eal_common_thread.c
@@ -252,6 +252,10 @@  static int ctrl_thread_init(void *arg)
 	struct rte_thread_ctrl_params *params = arg;
 
 	__rte_thread_init(rte_lcore_id(), cpuset);
+	/* set the value of the per-core variable _socket_id.
+	 * Convenient for threads to find memory.
+	 */
+	RTE_PER_LCORE(_socket_id) = SOCKET_ID_ANY;
 	params->ret = rte_thread_set_affinity_by_id(rte_thread_self(), cpuset);
 	if (params->ret != 0) {
 		__atomic_store_n(&params->ctrl_thread_status,
diff --git a/lib/eal/common/malloc_heap.c b/lib/eal/common/malloc_heap.c
index d25bdc98f9..a624f08cf7 100644
--- a/lib/eal/common/malloc_heap.c
+++ b/lib/eal/common/malloc_heap.c
@@ -716,6 +716,12 @@  malloc_get_numa_socket(void)
 		if (conf->socket_mem[socket_id] != 0)
 			return socket_id;
 	}
+	/* Trying to allocate memory on the main lcore numa node.
+	 * especially when the DPDK application is started only on one numa node.
+	 */
+	socket_id = rte_lcore_to_socket_id(rte_get_main_lcore());
+	if (socket_id != (unsigned int)SOCKET_ID_ANY)
+		return socket_id;
 
 	return rte_socket_id_by_idx(0);
 }