* [PATCH net-next] igc: Lift TAPRIO schedule restriction
@ 2022-06-06 9:27 Kurt Kanzenbach
2022-06-06 23:55 ` Vinicius Costa Gomes
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Kurt Kanzenbach @ 2022-06-06 9:27 UTC (permalink / raw)
To: Jesse Brandeburg, Tony Nguyen, Vinicius Costa Gomes
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
intel-wired-lan, netdev, Kurt Kanzenbach
Add support for Qbv schedules where one queue stays open
in consecutive entries. Currently that's not supported.
Example schedule:
|tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
| map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
| queues 1@0 1@1 2@2 \
| base-time ${BASETIME} \
| sched-entry S 0x01 300000 \ # Stream High/Low
| sched-entry S 0x06 500000 \ # Management and Best Effort
| sched-entry S 0x04 200000 \ # Best Effort
| flags 0x02
Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
---
drivers/net/ethernet/intel/igc/igc_main.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
index ae17af44fe02..4758bdbe5df3 100644
--- a/drivers/net/ethernet/intel/igc/igc_main.c
+++ b/drivers/net/ethernet/intel/igc/igc_main.c
@@ -5813,9 +5813,10 @@ static bool validate_schedule(struct igc_adapter *adapter,
return false;
for (n = 0; n < qopt->num_entries; n++) {
- const struct tc_taprio_sched_entry *e;
+ const struct tc_taprio_sched_entry *e, *prev;
int i;
+ prev = n ? &qopt->entries[n - 1] : NULL;
e = &qopt->entries[n];
/* i225 only supports "global" frame preemption
@@ -5828,7 +5829,12 @@ static bool validate_schedule(struct igc_adapter *adapter,
if (e->gate_mask & BIT(i))
queue_uses[i]++;
- if (queue_uses[i] > 1)
+ /* There are limitations: A single queue cannot be
+ * opened and closed multiple times per cycle unless the
+ * gate stays open. Check for it.
+ */
+ if (queue_uses[i] > 1 &&
+ !(prev->gate_mask & BIT(i)))
return false;
}
}
@@ -5872,6 +5878,7 @@ static int igc_tsn_clear_schedule(struct igc_adapter *adapter)
static int igc_save_qbv_schedule(struct igc_adapter *adapter,
struct tc_taprio_qopt_offload *qopt)
{
+ bool queue_configured[IGC_MAX_TX_QUEUES] = { };
u32 start_time = 0, end_time = 0;
size_t n;
@@ -5887,9 +5894,6 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
adapter->cycle_time = qopt->cycle_time;
adapter->base_time = qopt->base_time;
- /* FIXME: be a little smarter about cases when the gate for a
- * queue stays open for more than one entry.
- */
for (n = 0; n < qopt->num_entries; n++) {
struct tc_taprio_sched_entry *e = &qopt->entries[n];
int i;
@@ -5902,8 +5906,15 @@ static int igc_save_qbv_schedule(struct igc_adapter *adapter,
if (!(e->gate_mask & BIT(i)))
continue;
- ring->start_time = start_time;
+ /* Check whether a queue stays open for more than one
+ * entry. If so, keep the start and advance the end
+ * time.
+ */
+ if (!queue_configured[i])
+ ring->start_time = start_time;
ring->end_time = end_time;
+
+ queue_configured[i] = true;
}
start_time += e->interval;
--
2.30.2
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] igc: Lift TAPRIO schedule restriction
2022-06-06 9:27 [PATCH net-next] igc: Lift TAPRIO schedule restriction Kurt Kanzenbach
@ 2022-06-06 23:55 ` Vinicius Costa Gomes
2022-06-07 7:06 ` Kurt Kanzenbach
2022-06-24 23:56 ` Vinicius Costa Gomes
2022-07-11 5:14 ` [Intel-wired-lan] " naamax.meir
2 siblings, 1 reply; 7+ messages in thread
From: Vinicius Costa Gomes @ 2022-06-06 23:55 UTC (permalink / raw)
To: Kurt Kanzenbach, Jesse Brandeburg, Tony Nguyen
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
intel-wired-lan, netdev, Kurt Kanzenbach
Hi Kurt,
Kurt Kanzenbach <kurt@linutronix.de> writes:
> Add support for Qbv schedules where one queue stays open
> in consecutive entries. Currently that's not supported.
>
> Example schedule:
>
> |tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
> | map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
> | queues 1@0 1@1 2@2 \
> | base-time ${BASETIME} \
> | sched-entry S 0x01 300000 \ # Stream High/Low
> | sched-entry S 0x06 500000 \ # Management and Best Effort
> | sched-entry S 0x04 200000 \ # Best Effort
> | flags 0x02
>
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
> ---
> drivers/net/ethernet/intel/igc/igc_main.c | 23 +++++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
> index ae17af44fe02..4758bdbe5df3 100644
> --- a/drivers/net/ethernet/intel/igc/igc_main.c
> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
> @@ -5813,9 +5813,10 @@ static bool validate_schedule(struct igc_adapter *adapter,
> return false;
>
> for (n = 0; n < qopt->num_entries; n++) {
> - const struct tc_taprio_sched_entry *e;
> + const struct tc_taprio_sched_entry *e, *prev;
> int i;
>
> + prev = n ? &qopt->entries[n - 1] : NULL;
> e = &qopt->entries[n];
>
> /* i225 only supports "global" frame preemption
> @@ -5828,7 +5829,12 @@ static bool validate_schedule(struct igc_adapter *adapter,
> if (e->gate_mask & BIT(i))
> queue_uses[i]++;
>
> - if (queue_uses[i] > 1)
> + /* There are limitations: A single queue cannot be
> + * opened and closed multiple times per cycle unless the
> + * gate stays open. Check for it.
> + */
> + if (queue_uses[i] > 1 &&
> + !(prev->gate_mask & BIT(i)))
Perhaps I am missing something, I didn't try to run, but not checking if
'prev' can be NULL, could lead to crashes for some schedules, no?
What I have in mind is a schedule that queue 0 is mentioned multiple
times, for example:
| sched-entry S 0x01 300000 \ # Stream High/Low
| sched-entry S 0x03 500000 \ # Management and Best Effort
| sched-entry S 0x05 200000 \ # Best Effort
Anyway, looks much cleaner than what I had in mind when I wrote that
fixme.
Cheers,
--
Vinicius
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] igc: Lift TAPRIO schedule restriction
2022-06-06 23:55 ` Vinicius Costa Gomes
@ 2022-06-07 7:06 ` Kurt Kanzenbach
2022-06-07 17:14 ` Vinicius Costa Gomes
0 siblings, 1 reply; 7+ messages in thread
From: Kurt Kanzenbach @ 2022-06-07 7:06 UTC (permalink / raw)
To: Vinicius Costa Gomes, Jesse Brandeburg, Tony Nguyen
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
intel-wired-lan, netdev
[-- Attachment #1: Type: text/plain, Size: 3517 bytes --]
Hi Vinicius,
On Mon Jun 06 2022, Vinicius Costa Gomes wrote:
> Hi Kurt,
>
> Kurt Kanzenbach <kurt@linutronix.de> writes:
>
>> Add support for Qbv schedules where one queue stays open
>> in consecutive entries. Currently that's not supported.
>>
>> Example schedule:
>>
>> |tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
>> | map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
>> | queues 1@0 1@1 2@2 \
>> | base-time ${BASETIME} \
>> | sched-entry S 0x01 300000 \ # Stream High/Low
>> | sched-entry S 0x06 500000 \ # Management and Best Effort
>> | sched-entry S 0x04 200000 \ # Best Effort
>> | flags 0x02
>>
>> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
>> ---
>> drivers/net/ethernet/intel/igc/igc_main.c | 23 +++++++++++++++++------
>> 1 file changed, 17 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
>> index ae17af44fe02..4758bdbe5df3 100644
>> --- a/drivers/net/ethernet/intel/igc/igc_main.c
>> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
>> @@ -5813,9 +5813,10 @@ static bool validate_schedule(struct igc_adapter *adapter,
>> return false;
>>
>> for (n = 0; n < qopt->num_entries; n++) {
>> - const struct tc_taprio_sched_entry *e;
>> + const struct tc_taprio_sched_entry *e, *prev;
>> int i;
>>
>> + prev = n ? &qopt->entries[n - 1] : NULL;
>> e = &qopt->entries[n];
>>
>> /* i225 only supports "global" frame preemption
>> @@ -5828,7 +5829,12 @@ static bool validate_schedule(struct igc_adapter *adapter,
>> if (e->gate_mask & BIT(i))
>> queue_uses[i]++;
>>
>> - if (queue_uses[i] > 1)
>> + /* There are limitations: A single queue cannot be
>> + * opened and closed multiple times per cycle unless the
>> + * gate stays open. Check for it.
>> + */
>> + if (queue_uses[i] > 1 &&
>> + !(prev->gate_mask & BIT(i)))
>
> Perhaps I am missing something, I didn't try to run, but not checking if
> 'prev' can be NULL, could lead to crashes for some schedules, no?
My thinking was that `prev` can never be NULL, as `queue_uses[i] > 1` is
checked first. This condition can only be true if there are at least two
entries.
>
> What I have in mind is a schedule that queue 0 is mentioned multiple
> times, for example:
>
> | sched-entry S 0x01 300000 \ # Stream High/Low
> | sched-entry S 0x03 500000 \ # Management and Best Effort
> | sched-entry S 0x05 200000 \ # Best Effort
>
So, this schedule works with the proposed patch. Queue 0 is opened in
all three entries. My debug code shows:
|tc-6145 [010] ....... 616.190589: igc_setup_tc: Qbv configuration:
|tc-6145 [010] ....... 616.190592: igc_setup_tc: Queue 0 -- start_time=0 [ns]
|tc-6145 [010] ....... 616.190592: igc_setup_tc: Queue 0 -- end_time=1000000 [ns]
|tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 1 -- start_time=300000 [ns]
|tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 1 -- end_time=800000 [ns]
|tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 2 -- start_time=800000 [ns]
|tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 2 -- end_time=1000000 [ns]
|tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 3 -- start_time=800000 [ns]
|tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 3 -- end_time=1000000 [ns]
Anyway, I'd appreciate some testing on your side too :).
Thanks,
Kurt
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] igc: Lift TAPRIO schedule restriction
2022-06-07 7:06 ` Kurt Kanzenbach
@ 2022-06-07 17:14 ` Vinicius Costa Gomes
2022-06-08 6:00 ` Kurt Kanzenbach
0 siblings, 1 reply; 7+ messages in thread
From: Vinicius Costa Gomes @ 2022-06-07 17:14 UTC (permalink / raw)
To: Kurt Kanzenbach, Jesse Brandeburg, Tony Nguyen
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
intel-wired-lan, netdev
Hi Kurt,
Kurt Kanzenbach <kurt@linutronix.de> writes:
> Hi Vinicius,
>
> On Mon Jun 06 2022, Vinicius Costa Gomes wrote:
>> Hi Kurt,
>>
>> Kurt Kanzenbach <kurt@linutronix.de> writes:
>>
>>> Add support for Qbv schedules where one queue stays open
>>> in consecutive entries. Currently that's not supported.
>>>
>>> Example schedule:
>>>
>>> |tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
>>> | map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
>>> | queues 1@0 1@1 2@2 \
>>> | base-time ${BASETIME} \
>>> | sched-entry S 0x01 300000 \ # Stream High/Low
>>> | sched-entry S 0x06 500000 \ # Management and Best Effort
>>> | sched-entry S 0x04 200000 \ # Best Effort
>>> | flags 0x02
>>>
>>> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
>>> ---
>>> drivers/net/ethernet/intel/igc/igc_main.c | 23 +++++++++++++++++------
>>> 1 file changed, 17 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c
>>> index ae17af44fe02..4758bdbe5df3 100644
>>> --- a/drivers/net/ethernet/intel/igc/igc_main.c
>>> +++ b/drivers/net/ethernet/intel/igc/igc_main.c
>>> @@ -5813,9 +5813,10 @@ static bool validate_schedule(struct igc_adapter *adapter,
>>> return false;
>>>
>>> for (n = 0; n < qopt->num_entries; n++) {
>>> - const struct tc_taprio_sched_entry *e;
>>> + const struct tc_taprio_sched_entry *e, *prev;
>>> int i;
>>>
>>> + prev = n ? &qopt->entries[n - 1] : NULL;
>>> e = &qopt->entries[n];
>>>
>>> /* i225 only supports "global" frame preemption
>>> @@ -5828,7 +5829,12 @@ static bool validate_schedule(struct igc_adapter *adapter,
>>> if (e->gate_mask & BIT(i))
>>> queue_uses[i]++;
>>>
>>> - if (queue_uses[i] > 1)
>>> + /* There are limitations: A single queue cannot be
>>> + * opened and closed multiple times per cycle unless the
>>> + * gate stays open. Check for it.
>>> + */
>>> + if (queue_uses[i] > 1 &&
>>> + !(prev->gate_mask & BIT(i)))
>>
>> Perhaps I am missing something, I didn't try to run, but not checking if
>> 'prev' can be NULL, could lead to crashes for some schedules, no?
>
> My thinking was that `prev` can never be NULL, as `queue_uses[i] > 1` is
> checked first. This condition can only be true if there are at least two
> entries.
>
Oh, yeah! That's true. I have missed that.
>>
>> What I have in mind is a schedule that queue 0 is mentioned multiple
>> times, for example:
>>
>> | sched-entry S 0x01 300000 \ # Stream High/Low
>> | sched-entry S 0x03 500000 \ # Management and Best Effort
>> | sched-entry S 0x05 200000 \ # Best Effort
>>
>
> So, this schedule works with the proposed patch. Queue 0 is opened in
> all three entries. My debug code shows:
>
> |tc-6145 [010] ....... 616.190589: igc_setup_tc: Qbv configuration:
> |tc-6145 [010] ....... 616.190592: igc_setup_tc: Queue 0 -- start_time=0 [ns]
> |tc-6145 [010] ....... 616.190592: igc_setup_tc: Queue 0 -- end_time=1000000 [ns]
> |tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 1 -- start_time=300000 [ns]
> |tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 1 -- end_time=800000 [ns]
> |tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 2 -- start_time=800000 [ns]
> |tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 2 -- end_time=1000000 [ns]
> |tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 3 -- start_time=800000 [ns]
> |tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 3 -- end_time=1000000 [ns]
>
> Anyway, I'd appreciate some testing on your side too :).
Sure, I can give it a spin, but it'll have to be later in the week, kind
of swamped right now.
>
> Thanks,
> Kurt
--
Vinicius
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] igc: Lift TAPRIO schedule restriction
2022-06-07 17:14 ` Vinicius Costa Gomes
@ 2022-06-08 6:00 ` Kurt Kanzenbach
0 siblings, 0 replies; 7+ messages in thread
From: Kurt Kanzenbach @ 2022-06-08 6:00 UTC (permalink / raw)
To: Vinicius Costa Gomes, Jesse Brandeburg, Tony Nguyen
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
intel-wired-lan, netdev
[-- Attachment #1: Type: text/plain, Size: 1481 bytes --]
>>> What I have in mind is a schedule that queue 0 is mentioned multiple
>>> times, for example:
>>>
>>> | sched-entry S 0x01 300000 \ # Stream High/Low
>>> | sched-entry S 0x03 500000 \ # Management and Best Effort
>>> | sched-entry S 0x05 200000 \ # Best Effort
>>>
>>
>> So, this schedule works with the proposed patch. Queue 0 is opened in
>> all three entries. My debug code shows:
>>
>> |tc-6145 [010] ....... 616.190589: igc_setup_tc: Qbv configuration:
>> |tc-6145 [010] ....... 616.190592: igc_setup_tc: Queue 0 -- start_time=0 [ns]
>> |tc-6145 [010] ....... 616.190592: igc_setup_tc: Queue 0 -- end_time=1000000 [ns]
>> |tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 1 -- start_time=300000 [ns]
>> |tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 1 -- end_time=800000 [ns]
>> |tc-6145 [010] ....... 616.190593: igc_setup_tc: Queue 2 -- start_time=800000 [ns]
>> |tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 2 -- end_time=1000000 [ns]
>> |tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 3 -- start_time=800000 [ns]
>> |tc-6145 [010] ....... 616.190594: igc_setup_tc: Queue 3 -- end_time=1000000 [ns]
>>
>> Anyway, I'd appreciate some testing on your side too :).
>
> Sure, I can give it a spin, but it'll have to be later in the week, kind
> of swamped right now.
No problem. Actually i'm out of office for the next two weeks. I'll
update the patch afterwards if required.
Thanks,
Kurt
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH net-next] igc: Lift TAPRIO schedule restriction
2022-06-06 9:27 [PATCH net-next] igc: Lift TAPRIO schedule restriction Kurt Kanzenbach
2022-06-06 23:55 ` Vinicius Costa Gomes
@ 2022-06-24 23:56 ` Vinicius Costa Gomes
2022-07-11 5:14 ` [Intel-wired-lan] " naamax.meir
2 siblings, 0 replies; 7+ messages in thread
From: Vinicius Costa Gomes @ 2022-06-24 23:56 UTC (permalink / raw)
To: Kurt Kanzenbach, Jesse Brandeburg, Tony Nguyen
Cc: David S. Miller, Eric Dumazet, Jakub Kicinski, Paolo Abeni,
intel-wired-lan, netdev, Kurt Kanzenbach
Hi,
Kurt Kanzenbach <kurt@linutronix.de> writes:
> Add support for Qbv schedules where one queue stays open
> in consecutive entries. Currently that's not supported.
>
> Example schedule:
>
> |tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
> | map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
> | queues 1@0 1@1 2@2 \
> | base-time ${BASETIME} \
> | sched-entry S 0x01 300000 \ # Stream High/Low
> | sched-entry S 0x06 500000 \ # Management and Best Effort
> | sched-entry S 0x04 200000 \ # Best Effort
> | flags 0x02
>
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
> ---
Finally did a few rounds of testing here, everything worked as expected:
Reviewed-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Cheers,
--
Vinicius
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [Intel-wired-lan] [PATCH net-next] igc: Lift TAPRIO schedule restriction
2022-06-06 9:27 [PATCH net-next] igc: Lift TAPRIO schedule restriction Kurt Kanzenbach
2022-06-06 23:55 ` Vinicius Costa Gomes
2022-06-24 23:56 ` Vinicius Costa Gomes
@ 2022-07-11 5:14 ` naamax.meir
2 siblings, 0 replies; 7+ messages in thread
From: naamax.meir @ 2022-07-11 5:14 UTC (permalink / raw)
To: Kurt Kanzenbach, Jesse Brandeburg, Tony Nguyen, Vinicius Costa Gomes
Cc: netdev, Eric Dumazet, intel-wired-lan, Jakub Kicinski,
Paolo Abeni, David S. Miller
On 6/6/2022 12:27, Kurt Kanzenbach wrote:
> Add support for Qbv schedules where one queue stays open
> in consecutive entries. Currently that's not supported.
>
> Example schedule:
>
> |tc qdisc replace dev ${INTERFACE} handle 100 parent root taprio num_tc 3 \
> | map 2 2 1 0 2 2 2 2 2 2 2 2 2 2 2 2 \
> | queues 1@0 1@1 2@2 \
> | base-time ${BASETIME} \
> | sched-entry S 0x01 300000 \ # Stream High/Low
> | sched-entry S 0x06 500000 \ # Management and Best Effort
> | sched-entry S 0x04 200000 \ # Best Effort
> | flags 0x02
>
> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de>
> ---
> drivers/net/ethernet/intel/igc/igc_main.c | 23 +++++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
Tested-by: Naama Meir <naamax.meir@linux.intel.com>
^ permalink raw reply [flat|nested] 7+ messages in thread
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2022-06-06 9:27 [PATCH net-next] igc: Lift TAPRIO schedule restriction Kurt Kanzenbach
2022-06-06 23:55 ` Vinicius Costa Gomes
2022-06-07 7:06 ` Kurt Kanzenbach
2022-06-07 17:14 ` Vinicius Costa Gomes
2022-06-08 6:00 ` Kurt Kanzenbach
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