From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Andrew Rybchenko" <andrew.rybchenko@oktetlabs.ru>,
"Olivier Matz" <olivier.matz@6wind.com>
Cc: <dev@dpdk.org>, "Bruce Richardson" <bruce.richardson@intel.com>
Subject: RE: [PATCH v6 3/4] mempool: fix cache flushing algorithm
Date: Sun, 9 Oct 2022 17:08:39 +0200 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35D873B8@smartserver.smartshare.dk> (raw)
In-Reply-To: <c87c72cb-2623-387c-e5cf-c82b460a6cb9@oktetlabs.ru>
> From: Andrew Rybchenko [mailto:andrew.rybchenko@oktetlabs.ru]
> Sent: Sunday, 9 October 2022 16.52
>
> On 10/9/22 17:31, Morten Brørup wrote:
> >> From: Andrew Rybchenko [mailto:andrew.rybchenko@oktetlabs.ru]
> >> Sent: Sunday, 9 October 2022 15.38
> >>
> >> From: Morten Brørup <mb@smartsharesystems.com>
> >>
[...]
> >> --- a/lib/mempool/rte_mempool.h
> >> +++ b/lib/mempool/rte_mempool.h
> >> @@ -90,7 +90,7 @@ struct rte_mempool_cache {
> >> * Cache is allocated to this size to allow it to overflow in
> >> certain
> >> * cases to avoid needless emptying of cache.
> >> */
> >> - void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
> >> + void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 2]; /**< Cache objects */
> >> } __rte_cache_aligned;
> >
> > How much are we allowed to break the ABI here?
> >
> > This patch reduces the size of the structure by removing a now unused
> part at the end, which should be harmless.
> >
> > If we may also move the position of the objs array, I would add
> __rte_cache_aligned to the objs array. It makes no difference in the
> general case, but if get/put operations are always 32 objects, it will
> reduce the number of memory (or last level cache) accesses from five to
> four 64 B cache lines for every get/put operation.
> >
> > uint32_t len; /**< Current cache count */
> > - /*
> > - * Cache is allocated to this size to allow it to overflow in
> certain
> > - * cases to avoid needless emptying of cache.
> > - */
> > - void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 3]; /**< Cache objects */
> > + /**
> > + * Cache objects
> > + *
> > + * Cache is allocated to this size to allow it to overflow in
> certain
> > + * cases to avoid needless emptying of cache.
> > + */
> > + void *objs[RTE_MEMPOOL_CACHE_MAX_SIZE * 2] __rte_cache_aligned;
> > } __rte_cache_aligned;
>
> I think aligning objs on cacheline should be a separate patch.
Good point. I'll let you do it. :-)
PS: Thank you for following up on this patch series, Andrew!
-Morten
next prev parent reply other threads:[~2022-10-09 15:08 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-26 15:34 [RFC] mempool: rte_mempool_do_generic_get optimizations Morten Brørup
2022-01-06 12:23 ` [PATCH] mempool: optimize incomplete cache handling Morten Brørup
2022-01-06 16:55 ` Jerin Jacob
2022-01-07 8:46 ` Morten Brørup
2022-01-10 7:26 ` Jerin Jacob
2022-01-10 10:55 ` Morten Brørup
2022-01-14 16:36 ` [PATCH] mempool: fix get objects from mempool with cache Morten Brørup
2022-01-17 17:35 ` Bruce Richardson
2022-01-18 8:25 ` Morten Brørup
2022-01-18 9:07 ` Bruce Richardson
2022-01-24 15:38 ` Olivier Matz
2022-01-24 16:11 ` Olivier Matz
2022-01-28 10:22 ` Morten Brørup
2022-01-17 11:52 ` [PATCH] mempool: optimize put objects to " Morten Brørup
2022-01-19 14:52 ` [PATCH v2] mempool: fix " Morten Brørup
2022-01-19 15:03 ` [PATCH v3] " Morten Brørup
2022-01-24 15:39 ` Olivier Matz
2022-01-28 9:37 ` Morten Brørup
2022-02-02 8:14 ` [PATCH v2] mempool: fix get objects from " Morten Brørup
2022-06-15 21:18 ` Morten Brørup
2022-09-29 10:52 ` Morten Brørup
2022-10-04 12:57 ` Andrew Rybchenko
2022-10-04 15:13 ` Morten Brørup
2022-10-04 15:58 ` Andrew Rybchenko
2022-10-04 18:09 ` Morten Brørup
2022-10-06 13:43 ` Aaron Conole
2022-10-04 16:03 ` Morten Brørup
2022-10-04 16:36 ` Morten Brørup
2022-10-04 16:39 ` Morten Brørup
2022-02-02 10:33 ` [PATCH v4] mempool: fix mempool cache flushing algorithm Morten Brørup
2022-04-07 9:04 ` Morten Brørup
2022-04-07 9:14 ` Bruce Richardson
2022-04-07 9:26 ` Morten Brørup
2022-04-07 10:32 ` Bruce Richardson
2022-04-07 10:43 ` Bruce Richardson
2022-04-07 11:36 ` Morten Brørup
2022-10-04 20:01 ` Morten Brørup
2022-10-09 11:11 ` [PATCH 1/2] mempool: check driver enqueue result in one place Andrew Rybchenko
2022-10-09 11:11 ` [PATCH 2/2] mempool: avoid usage of term ring on put Andrew Rybchenko
2022-10-09 13:08 ` Morten Brørup
2022-10-09 13:14 ` Andrew Rybchenko
2022-10-09 13:01 ` [PATCH 1/2] mempool: check driver enqueue result in one place Morten Brørup
2022-10-09 13:19 ` [PATCH v4] mempool: fix mempool cache flushing algorithm Andrew Rybchenko
2022-10-04 12:53 ` [PATCH v3] mempool: fix get objects from mempool with cache Andrew Rybchenko
2022-10-04 14:42 ` Morten Brørup
2022-10-07 10:44 ` [PATCH v4] " Andrew Rybchenko
2022-10-08 20:56 ` Thomas Monjalon
2022-10-11 20:30 ` Copy-pasted code should be updated Morten Brørup
2022-10-11 21:47 ` Honnappa Nagarahalli
2022-10-30 8:44 ` Morten Brørup
2022-10-30 22:50 ` Honnappa Nagarahalli
2022-10-14 14:01 ` [PATCH v4] mempool: fix get objects from mempool with cache Olivier Matz
2022-10-09 13:37 ` [PATCH v6 0/4] mempool: fix mempool cache flushing algorithm Andrew Rybchenko
2022-10-09 13:37 ` [PATCH v6 1/4] mempool: check driver enqueue result in one place Andrew Rybchenko
2022-10-09 13:37 ` [PATCH v6 2/4] mempool: avoid usage of term ring on put Andrew Rybchenko
2022-10-09 13:37 ` [PATCH v6 3/4] mempool: fix cache flushing algorithm Andrew Rybchenko
2022-10-09 14:31 ` Morten Brørup
2022-10-09 14:51 ` Andrew Rybchenko
2022-10-09 15:08 ` Morten Brørup [this message]
2022-10-14 14:01 ` Olivier Matz
2022-10-14 15:57 ` Morten Brørup
2022-10-14 19:50 ` Olivier Matz
2022-10-15 6:57 ` Morten Brørup
2022-10-18 16:32 ` Jerin Jacob
2022-10-09 13:37 ` [PATCH v6 4/4] mempool: flush cache completely on overflow Andrew Rybchenko
2022-10-09 14:44 ` Morten Brørup
2022-10-14 14:01 ` Olivier Matz
2022-10-10 15:21 ` [PATCH v6 0/4] mempool: fix mempool cache flushing algorithm Thomas Monjalon
2022-10-11 19:26 ` Morten Brørup
2022-10-26 14:09 ` Thomas Monjalon
2022-10-26 14:26 ` Morten Brørup
2022-10-26 14:44 ` [PATCH] mempool: cache align mempool cache objects Morten Brørup
2022-10-26 19:44 ` Andrew Rybchenko
2022-10-27 8:34 ` Olivier Matz
2022-10-27 9:22 ` Morten Brørup
2022-10-27 11:42 ` Olivier Matz
2022-10-27 12:11 ` Morten Brørup
2022-10-27 15:20 ` Olivier Matz
2022-10-28 6:35 ` [PATCH v3 1/2] " Morten Brørup
2022-10-28 6:35 ` [PATCH v3 2/2] mempool: optimized debug statistics Morten Brørup
2022-10-28 6:41 ` [PATCH v4 1/2] mempool: cache align mempool cache objects Morten Brørup
2022-10-28 6:41 ` [PATCH v4 2/2] mempool: optimized debug statistics Morten Brørup
2022-10-30 9:09 ` Morten Brørup
2022-10-30 9:16 ` Thomas Monjalon
2022-10-30 9:17 ` [PATCH v4 1/2] mempool: cache align mempool cache objects Thomas Monjalon
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