[dpdk-dev] [PATCH] eal/windows: ensure all the CPUs in the set are checked

[dpdk-dev] [PATCH] eal/windows: ensure all the CPUs in the set are checked

[Narcisa Ana Maria Vasile]

From: Narcisa Vasile <navasile@microsoft.com>

Fix count_cpu() to ensure it iterates through all the CPUs in a set.
count_cpu() iterates through the CPUs in the set 's' and counts the
selected ones.

Previously, it was incorrectly using the number of CPUSETS to iterate
through the CPUs.

Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
---
 lib/eal/windows/include/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/eal/windows/include/sched.h b/lib/eal/windows/include/sched.h
index ff572b5dcb..bc31cc8465 100644
--- a/lib/eal/windows/include/sched.h
+++ b/lib/eal/windows/include/sched.h
@@ -49,7 +49,7 @@ count_cpu(rte_cpuset_t *s)
 	unsigned int _i;
 	int count = 0;
 
-	for (_i = 0; _i < _NUM_SETS(CPU_SETSIZE); _i++)
+	for (_i = 0; _i < CPU_SETSIZE; _i++)
 		if (CPU_ISSET(_i, s) != 0LL)
 			count++;
 	return count;
-- 
2.31.0.vfs.0.1

Re: [dpdk-dev] [PATCH] eal/windows: ensure all the CPUs in the set are checked

[Dmitry Kozlyuk]

2021-06-24 17:27 (UTC-0700), Narcisa Ana Maria Vasile:
> From: Narcisa Vasile <navasile@microsoft.com>
> 
> Fix count_cpu() to ensure it iterates through all the CPUs in a set.
> count_cpu() iterates through the CPUs in the set 's' and counts the
> selected ones.
> 
> Previously, it was incorrectly using the number of CPUSETS to iterate
> through the CPUs.
>
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> ---
>  lib/eal/windows/include/sched.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/eal/windows/include/sched.h b/lib/eal/windows/include/sched.h
> index ff572b5dcb..bc31cc8465 100644
> --- a/lib/eal/windows/include/sched.h
> +++ b/lib/eal/windows/include/sched.h
> @@ -49,7 +49,7 @@ count_cpu(rte_cpuset_t *s)
>  	unsigned int _i;
>  	int count = 0;
>  
> -	for (_i = 0; _i < _NUM_SETS(CPU_SETSIZE); _i++)
> +	for (_i = 0; _i < CPU_SETSIZE; _i++)
>  		if (CPU_ISSET(_i, s) != 0LL)
>  			count++;
>  	return count;

Hi Naty,

Thank you for the fix, but we also need a proper commit message:

https://doc.dpdk.org/guides/contributing/patches.html#commit-messages-body

Specifically, please, describe what was the observable issue (usually first
comes what was wrong, then how it is fixed now) and add "Fixes" tag and Cc.
Also, "number of CPUSETS" sounds unclear, as there's no "CPUSET".
Suggestion: "number of bitset limbs" or maybe if you describe what was
wrong with the result you won't need to describe its reason precisely at all.

[dpdk-dev] [PATCH v2] eal/windows: ensure all enabled CPUs are counted

[Narcisa Ana Maria Vasile]

From: Narcisa Vasile <navasile@microsoft.com>

rte_cpuset_t describes a set of CPUs by using an array of masks
named '_bits'. Each element in the '_bits' array represents
a bit mask, with each bit corresponding to a CPU.
The maximum number of CPUs is given by 'CPU_SETSIZE'.
The number of bit masks is computed using '_NUM_SETS(CPU_SETSIZE)'.

count_cpu() should count the number of CPUs enabled in the set 's'.
Currently, it iterates through the number of masks in the
set 's', instead of iterating through all the bits in all the masks.
For example, if '_NUM_SETS(CPU_SETSIZE)' returns 2,
which means there are 2 bit masks: _bits[0] and _bits[1],
count_cpu() would only check if CPUs '0' and '1' are enabled.
The correct behavior is to iterate through all the CPUs in the set and
count the ones that are enabled.

This patch fixes count_cpu() to ensure all the bits in all the masks
are checked to compute the correct number of CPUs enabled in 's'.

Fixes: e8428a9d89f1 ("eal/windows: add some basic functions and macros")
Cc: pallavi.kadam@intel.com
Cc: stable@dpdk.org

Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
---
v2:
  * Fix commit message.

 lib/eal/windows/include/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/eal/windows/include/sched.h b/lib/eal/windows/include/sched.h
index ff572b5dcb..bc31cc8465 100644
--- a/lib/eal/windows/include/sched.h
+++ b/lib/eal/windows/include/sched.h
@@ -49,7 +49,7 @@ count_cpu(rte_cpuset_t *s)
 	unsigned int _i;
 	int count = 0;
 
-	for (_i = 0; _i < _NUM_SETS(CPU_SETSIZE); _i++)
+	for (_i = 0; _i < CPU_SETSIZE; _i++)
 		if (CPU_ISSET(_i, s) != 0LL)
 			count++;
 	return count;
-- 
2.31.0.vfs.0.1

Re: [dpdk-dev] [PATCH] eal/windows: ensure all the CPUs in the set are checked

[Narcisa Ana Maria Vasile]

On Fri, Jun 25, 2021 at 11:36:21AM +0300, Dmitry Kozlyuk wrote:
> 2021-06-24 17:27 (UTC-0700), Narcisa Ana Maria Vasile:
> > From: Narcisa Vasile <navasile@microsoft.com>
> > 
> > Fix count_cpu() to ensure it iterates through all the CPUs in a set.
> > count_cpu() iterates through the CPUs in the set 's' and counts the
> > selected ones.
> > 
> > Previously, it was incorrectly using the number of CPUSETS to iterate
> > through the CPUs.
> >
> > Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> > ---
> >  lib/eal/windows/include/sched.h | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Hi Naty,
> 
> Thank you for the fix, but we also need a proper commit message:
> 
> https://doc.dpdk.org/guides/contributing/patches.html#commit-messages-body
> 
> Specifically, please, describe what was the observable issue (usually first
> comes what was wrong, then how it is fixed now) and add "Fixes" tag and Cc.
> Also, "number of CPUSETS" sounds unclear, as there's no "CPUSET".
> Suggestion: "number of bitset limbs" or maybe if you describe what was
> wrong with the result you won't need to describe its reason precisely at all.

Ah, I've mixed some terminology here..
Thank you Dmitry for the feedback!

Re: [dpdk-dev] [PATCH v2] eal/windows: ensure all enabled CPUs are counted

[Dmitry Kozlyuk]

2021-06-29 18:56 (UTC-0700), Narcisa Ana Maria Vasile:
> From: Narcisa Vasile <navasile@microsoft.com>
> 
> rte_cpuset_t describes a set of CPUs by using an array of masks
> named '_bits'. Each element in the '_bits' array represents
> a bit mask, with each bit corresponding to a CPU.
> The maximum number of CPUs is given by 'CPU_SETSIZE'.
> The number of bit masks is computed using '_NUM_SETS(CPU_SETSIZE)'.
> 
> count_cpu() should count the number of CPUs enabled in the set 's'.
> Currently, it iterates through the number of masks in the
> set 's', instead of iterating through all the bits in all the masks.
> For example, if '_NUM_SETS(CPU_SETSIZE)' returns 2,
> which means there are 2 bit masks: _bits[0] and _bits[1],
> count_cpu() would only check if CPUs '0' and '1' are enabled.
> The correct behavior is to iterate through all the CPUs in the set and
> count the ones that are enabled.
> 
> This patch fixes count_cpu() to ensure all the bits in all the masks
> are checked to compute the correct number of CPUs enabled in 's'.
> 
> Fixes: e8428a9d89f1 ("eal/windows: add some basic functions and macros")
> Cc: pallavi.kadam@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> ---
> v2:
>   * Fix commit message.
> 
>  lib/eal/windows/include/sched.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/eal/windows/include/sched.h b/lib/eal/windows/include/sched.h
> index ff572b5dcb..bc31cc8465 100644
> --- a/lib/eal/windows/include/sched.h
> +++ b/lib/eal/windows/include/sched.h
> @@ -49,7 +49,7 @@ count_cpu(rte_cpuset_t *s)
>  	unsigned int _i;
>  	int count = 0;
>  
> -	for (_i = 0; _i < _NUM_SETS(CPU_SETSIZE); _i++)
> +	for (_i = 0; _i < CPU_SETSIZE; _i++)
>  		if (CPU_ISSET(_i, s) != 0LL)
>  			count++;
>  	return count;

Sorry, I lost track of this patch.
Great and thorough explanation, but I don't think it needs to be so long.
Suggestion:

	On Windows, -l/--lcores EAL option was unable to process CPU sets
	containing CPUs other than 0 and 1, because CPU_COUNT() macro
	only checked these CPUs in the set. Fix CPU_COUNT() by enumerating
	all possible CPU indices.

Whatever message is taken in the end,
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>

Re: [dpdk-dev] [PATCH v2] eal/windows: ensure all enabled CPUs are counted

[Kadam, Pallavi]

On 6/29/2021 6:56 PM, Narcisa Ana Maria Vasile wrote:
> From: Narcisa Vasile <navasile@microsoft.com>
>
> rte_cpuset_t describes a set of CPUs by using an array of masks
> named '_bits'. Each element in the '_bits' array represents
> a bit mask, with each bit corresponding to a CPU.
> The maximum number of CPUs is given by 'CPU_SETSIZE'.
> The number of bit masks is computed using '_NUM_SETS(CPU_SETSIZE)'.
>
> count_cpu() should count the number of CPUs enabled in the set 's'.
> Currently, it iterates through the number of masks in the
> set 's', instead of iterating through all the bits in all the masks.
> For example, if '_NUM_SETS(CPU_SETSIZE)' returns 2,
> which means there are 2 bit masks: _bits[0] and _bits[1],
> count_cpu() would only check if CPUs '0' and '1' are enabled.
> The correct behavior is to iterate through all the CPUs in the set and
> count the ones that are enabled.
>
> This patch fixes count_cpu() to ensure all the bits in all the masks
> are checked to compute the correct number of CPUs enabled in 's'.
>
> Fixes: e8428a9d89f1 ("eal/windows: add some basic functions and macros")
> Cc: pallavi.kadam@intel.com
> Cc: stable@dpdk.org
>
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> ---
Acked-by: Pallavi Kadam <pallavi.kadam@intel.com>

[dpdk-dev] [PATCH v3] eal/windows: ensure all enabled CPUs are counted

[Narcisa Ana Maria Vasile]

From: Narcisa Vasile <navasile@microsoft.com>

On Windows, -l/--lcores EAL option was unable to process CPU sets
containing CPUs other than 0 and 1, because CPU_COUNT() macro
only checked these CPUs in the set. Fix CPU_COUNT() by enumerating
all possible CPU indices.

Fixes: e8428a9d89f1 ("eal/windows: add some basic functions and macros")
Cc: pallavi.kadam@intel.com
Cc: stable@dpdk.org

Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
Acked-by: Pallavi Kadam <pallavi.kadam@intel.com>
---
 lib/eal/windows/include/sched.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/eal/windows/include/sched.h b/lib/eal/windows/include/sched.h
index ff572b5dcb..bc31cc8465 100644
--- a/lib/eal/windows/include/sched.h
+++ b/lib/eal/windows/include/sched.h
@@ -49,7 +49,7 @@ count_cpu(rte_cpuset_t *s)
 	unsigned int _i;
 	int count = 0;
 
-	for (_i = 0; _i < _NUM_SETS(CPU_SETSIZE); _i++)
+	for (_i = 0; _i < CPU_SETSIZE; _i++)
 		if (CPU_ISSET(_i, s) != 0LL)
 			count++;
 	return count;
-- 
2.31.0.vfs.0.1

Re: [dpdk-dev] [PATCH v3] eal/windows: ensure all enabled CPUs are counted

[Narcisa Ana Maria Vasile]

On Wed, Aug 18, 2021 at 06:46:00AM -0700, Narcisa Ana Maria Vasile wrote:
> From: Narcisa Vasile <navasile@microsoft.com>
> 
> On Windows, -l/--lcores EAL option was unable to process CPU sets
> containing CPUs other than 0 and 1, because CPU_COUNT() macro
> only checked these CPUs in the set. Fix CPU_COUNT() by enumerating
> all possible CPU indices.
> 
> Fixes: e8428a9d89f1 ("eal/windows: add some basic functions and macros")
> Cc: pallavi.kadam@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
> Acked-by: Pallavi Kadam <pallavi.kadam@intel.com>
> ---
Can this be merged? This small fix will solve the issues related to threads
affinity on Windows. Thanks!

Re: [dpdk-dev] [dpdk-stable] [PATCH v3] eal/windows: ensure all enabled CPUs are counted

[Thomas Monjalon]

18/08/2021 15:46, Narcisa Ana Maria Vasile:
> From: Narcisa Vasile <navasile@microsoft.com>
> 
> On Windows, -l/--lcores EAL option was unable to process CPU sets
> containing CPUs other than 0 and 1, because CPU_COUNT() macro
> only checked these CPUs in the set. Fix CPU_COUNT() by enumerating
> all possible CPU indices.
> 
> Fixes: e8428a9d89f1 ("eal/windows: add some basic functions and macros")
> Cc: pallavi.kadam@intel.com
> Cc: stable@dpdk.org
> 
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> Acked-by: Dmitry Kozlyuk <dmitry.kozliuk@gmail.com>
> Acked-by: Pallavi Kadam <pallavi.kadam@intel.com>

Applied, thanks.
Sorry for the delay.