From: "Mattias Rönnblom" <mattias.ronnblom@ericsson.com>
To: "Van Haaren, Harry" <harry.van.haaren@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"Honnappa Nagarahalli" <Honnappa.Nagarahalli@arm.com>,
"Morten Brørup" <mb@smartsharesystems.com>, nd <nd@arm.com>
Subject: Re: [PATCH 1/6] service: reduce statistics overhead for parallel services
Date: Mon, 3 Oct 2022 14:37:20 +0000 [thread overview]
Message-ID: <8238eb97-a2ee-4d47-d278-fc5001efd78b@ericsson.com> (raw)
In-Reply-To: <BN0PR11MB5712B461896AC6294B58CF52D75B9@BN0PR11MB5712.namprd11.prod.outlook.com>
On 2022-10-03 15:33, Van Haaren, Harry wrote:
>> -----Original Message-----
>> From: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
>> Sent: Tuesday, September 6, 2022 5:14 PM
>> To: Van; Haaren; Van Haaren, Harry <harry.van.haaren@intel.com>
>> Cc: dev@dpdk.org; Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>;
>> Morten Brørup <mb@smartsharesystems.com>; nd <nd@arm.com>;
>> mattias.ronnblom <mattias.ronnblom@ericsson.com>
>> Subject: [PATCH 1/6] service: reduce statistics overhead for parallel services
>>
>> Move the statistics from the service data structure to the per-lcore
>> struct. This eliminates contention for the counter cache lines, which
>> decreases the producer-side statistics overhead for services deployed
>> across many lcores.
>
> Agree with the approach, good stuff. One comment below, but no changes
> necessary.
>
>> Prior to this patch, enabling statistics for a service with a
>> per-service function call latency of 1000 clock cycles deployed across
>> 16 cores on a Intel Xeon 6230N @ 2,3 GHz would incur a cost of ~10000
>> core clock cycles per service call. After this patch, the statistics
>> overhead is reduce to 22 clock cycles per call.
>>
>> Signed-off-by: Mattias Rönnblom <mattias.ronnblom@ericsson.com>
>
> Tested by applying the two patch fixes first (https://protect2.fireeye.com/v1/url?k=31323334-501d5122-313273af-454445555731-733cb32d7965fb15&q=1&e=2a5d80ad-c4ec-40ca-b66d-1b546435288d&u=http%3A%2F%2Fpatches.dpdk.org%2Fproject%2Fdpdk%2Flist%2F%3Fseries%3D23959)
> and this patchset from Mattias.
>
> Acked-by: Harry van Haaren <harry.van.haaren@intel.com>
>
> <snip>
>
>> static uint32_t rte_service_count;
>> @@ -138,13 +130,16 @@ rte_service_finalize(void)
>> rte_service_library_initialized = 0;
>> }
>>
>> -/* returns 1 if service is registered and has not been unregistered
>> - * Returns 0 if service never registered, or has been unregistered
>> - */
>> -static inline int
>> +static inline bool
>> +service_registered(uint32_t id)
>> +{
>> + return rte_services[id].internal_flags & SERVICE_F_REGISTERED;
>> +}
>
> Before we had a !! to flip any value (e.g. binary 100 to just binary 1).
> SERVICE_F_REGISTERED is binary 1,and internal_flags is u8, so its fine as is.
>
> <snip>
>
Since the function now returns a bool, it does not matter what size the
internal_flags field has or which of its bits SERVICE_F_REGISTERED
refers to.
next prev parent reply other threads:[~2022-10-03 14:37 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-08 12:56 [PATCH 1/2] test/service: add perf measurements for with stats mode Harry van Haaren
2022-07-08 12:56 ` [PATCH 2/2] service: fix potential stats race-condition on MT services Harry van Haaren
2022-07-08 13:23 ` Morten Brørup
2022-07-08 13:44 ` Van Haaren, Harry
2022-07-08 14:14 ` Morten Brørup
2022-07-08 13:48 ` Mattias Rönnblom
2022-07-08 15:16 ` Honnappa Nagarahalli
2022-07-08 15:31 ` Van Haaren, Harry
2022-07-08 16:21 ` Bruce Richardson
2022-07-08 16:33 ` Honnappa Nagarahalli
2022-07-08 20:02 ` Mattias Rönnblom
2022-07-08 16:29 ` Morten Brørup
2022-07-08 16:45 ` Honnappa Nagarahalli
2022-07-08 17:22 ` Morten Brørup
2022-07-08 17:39 ` Honnappa Nagarahalli
2022-07-08 18:08 ` Morten Brørup
2022-09-06 16:13 ` [PATCH 1/6] service: reduce statistics overhead for parallel services Mattias Rönnblom
2022-09-06 16:13 ` [PATCH 2/6] service: introduce per-lcore cycles counter Mattias Rönnblom
2022-09-06 16:13 ` [PATCH 3/6] service: reduce average case service core overhead Mattias Rönnblom
2022-10-03 13:33 ` Van Haaren, Harry
2022-10-03 14:32 ` Mattias Rönnblom
2022-09-06 16:13 ` [PATCH 4/6] service: tweak cycle statistics semantics Mattias Rönnblom
2022-09-07 8:41 ` Morten Brørup
2022-10-03 13:45 ` Van Haaren, Harry
2022-09-06 16:13 ` [PATCH 5/6] event/sw: report idle when no work is performed Mattias Rönnblom
2022-09-06 16:13 ` [PATCH 6/6] service: provide links to functions in documentation Mattias Rönnblom
2022-10-03 8:06 ` [PATCH 1/6] service: reduce statistics overhead for parallel services David Marchand
2022-10-03 8:40 ` Mattias Rönnblom
2022-10-03 9:53 ` David Marchand
2022-10-03 11:37 ` Mattias Rönnblom
2022-10-03 13:03 ` Van Haaren, Harry
2022-10-03 13:33 ` Van Haaren, Harry
2022-10-03 14:37 ` Mattias Rönnblom [this message]
2022-10-05 9:16 ` [PATCH v2 0/6] Service cores performance and statistics improvements Mattias Rönnblom
2022-10-05 9:16 ` [PATCH v2 1/6] service: reduce statistics overhead for parallel services Mattias Rönnblom
2022-10-05 9:16 ` [PATCH v2 2/6] service: introduce per-lcore cycles counter Mattias Rönnblom
2022-10-05 9:16 ` [PATCH v2 3/6] service: reduce average case service core overhead Mattias Rönnblom
2022-10-05 9:16 ` [PATCH v2 4/6] service: tweak cycle statistics semantics Mattias Rönnblom
2022-10-05 9:16 ` [PATCH v2 5/6] event/sw: report idle when no work is performed Mattias Rönnblom
2022-10-05 9:16 ` [PATCH v2 6/6] service: provide links to functions in documentation Mattias Rönnblom
2022-10-05 9:49 ` [PATCH v2 0/6] Service cores performance and statistics improvements Morten Brørup
2022-10-05 10:14 ` Mattias Rönnblom
2022-10-05 13:39 ` David Marchand
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