From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Bruce Richardson" <bruce.richardson@intel.com>
Cc: "Dharmik Thakkar" <dharmik.thakkar@arm.com>, <dev@dpdk.org>,
<nd@arm.com>, <honnappa.nagarahalli@arm.com>,
<ruifeng.wang@arm.com>
Subject: RE: [PATCH 0/1] mempool: implement index-based per core cache
Date: Fri, 7 Jan 2022 12:29:23 +0100 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35D86DEA@smartserver.smartshare.dk> (raw)
In-Reply-To: <Ydgg7YlndpBb0g+w@bricha3-MOBL.ger.corp.intel.com>
> From: Bruce Richardson [mailto:bruce.richardson@intel.com]
> Sent: Friday, 7 January 2022 12.16
>
> On Sat, Dec 25, 2021 at 01:16:03AM +0100, Morten Brørup wrote:
> > > From: Dharmik Thakkar [mailto:dharmik.thakkar@arm.com] Sent:
> Friday, 24
> > > December 2021 23.59
> > >
> > > Current mempool per core cache implementation stores pointers to
> mbufs
> > > On 64b architectures, each pointer consumes 8B This patch replaces
> it
> > > with index-based implementation, where in each buffer is addressed
> by
> > > (pool base address + index) It reduces the amount of memory/cache
> > > required for per core cache
> > >
> > > L3Fwd performance testing reveals minor improvements in the cache
> > > performance (L1 and L2 misses reduced by 0.60%) with no change in
> > > throughput
> > >
> > > Micro-benchmarking the patch using mempool_perf_test shows
> significant
> > > improvement with majority of the test cases
> > >
> > > Number of cores = 1: n_get_bulk=1 n_put_bulk=1 n_keep=32
> > > %_change_with_patch=18.01 n_get_bulk=1 n_put_bulk=1 n_keep=128
> > > %_change_with_patch=19.91 n_get_bulk=1 n_put_bulk=4 n_keep=32
> > > %_change_with_patch=-20.37 (regression) n_get_bulk=1 n_put_bulk=4
> > > n_keep=128 %_change_with_patch=-17.01 (regression) n_get_bulk=1
> > > n_put_bulk=32 n_keep=32 %_change_with_patch=-25.06 (regression)
> > > n_get_bulk=1 n_put_bulk=32 n_keep=128 %_change_with_patch=-23.81
> > > (regression) n_get_bulk=4 n_put_bulk=1 n_keep=32
> > > %_change_with_patch=53.93 n_get_bulk=4 n_put_bulk=1 n_keep=128
> > > %_change_with_patch=60.90 n_get_bulk=4 n_put_bulk=4 n_keep=32
> > > %_change_with_patch=1.64 n_get_bulk=4 n_put_bulk=4 n_keep=128
> > > %_change_with_patch=8.76 n_get_bulk=4 n_put_bulk=32 n_keep=32
> > > %_change_with_patch=-4.71 (regression) n_get_bulk=4 n_put_bulk=32
> > > n_keep=128 %_change_with_patch=-3.19 (regression) n_get_bulk=32
> > > n_put_bulk=1 n_keep=32 %_change_with_patch=65.63 n_get_bulk=32
> > > n_put_bulk=1 n_keep=128 %_change_with_patch=75.19 n_get_bulk=32
> > > n_put_bulk=4 n_keep=32 %_change_with_patch=11.75 n_get_bulk=32
> > > n_put_bulk=4 n_keep=128 %_change_with_patch=15.52 n_get_bulk=32
> > > n_put_bulk=32 n_keep=32 %_change_with_patch=13.45 n_get_bulk=32
> > > n_put_bulk=32 n_keep=128 %_change_with_patch=11.58
> > >
> > > Number of core = 2: n_get_bulk=1 n_put_bulk=1 n_keep=32
> > > %_change_with_patch=18.21 n_get_bulk=1 n_put_bulk=1 n_keep=128
> > > %_change_with_patch=21.89 n_get_bulk=1 n_put_bulk=4 n_keep=32
> > > %_change_with_patch=-21.21 (regression) n_get_bulk=1 n_put_bulk=4
> > > n_keep=128 %_change_with_patch=-17.05 (regression) n_get_bulk=1
> > > n_put_bulk=32 n_keep=32 %_change_with_patch=-26.09 (regression)
> > > n_get_bulk=1 n_put_bulk=32 n_keep=128 %_change_with_patch=-23.49
> > > (regression) n_get_bulk=4 n_put_bulk=1 n_keep=32
> > > %_change_with_patch=56.28 n_get_bulk=4 n_put_bulk=1 n_keep=128
> > > %_change_with_patch=67.69 n_get_bulk=4 n_put_bulk=4 n_keep=32
> > > %_change_with_patch=1.45 n_get_bulk=4 n_put_bulk=4 n_keep=128
> > > %_change_with_patch=8.84 n_get_bulk=4 n_put_bulk=32 n_keep=32
> > > %_change_with_patch=-5.27 (regression) n_get_bulk=4 n_put_bulk=32
> > > n_keep=128 %_change_with_patch=-3.09 (regression) n_get_bulk=32
> > > n_put_bulk=1 n_keep=32 %_change_with_patch=76.11 n_get_bulk=32
> > > n_put_bulk=1 n_keep=128 %_change_with_patch=86.06 n_get_bulk=32
> > > n_put_bulk=4 n_keep=32 %_change_with_patch=11.86 n_get_bulk=32
> > > n_put_bulk=4 n_keep=128 %_change_with_patch=16.55 n_get_bulk=32
> > > n_put_bulk=32 n_keep=32 %_change_with_patch=13.01 n_get_bulk=32
> > > n_put_bulk=32 n_keep=128 %_change_with_patch=11.51
> > >
> > >
> > > From analyzing the results, it is clear that for n_get_bulk and
> > > n_put_bulk sizes of 32 there is no performance regression IMO, the
> > > other sizes are not practical from performance perspective and the
> > > regression in those cases can be safely ignored
> > >
> > > Dharmik Thakkar (1): mempool: implement index-based per core cache
> > >
> > > lib/mempool/rte_mempool.h | 114
> +++++++++++++++++++++++++-
> > > lib/mempool/rte_mempool_ops_default.c | 7 ++ 2 files changed,
> 119
> > > insertions(+), 2 deletions(-)
> > >
> > > -- 2.25.1
> > >
> >
> > I still think this is very interesting. And your performance numbers
> are
> > looking good.
> >
> > However, it limits the size of a mempool to 4 GB. As previously
> > discussed, the max mempool size can be increased by multiplying the
> index
> > with a constant.
> >
> > I would suggest using sizeof(uintptr_t) as the constant multiplier,
> so
> > the mempool can hold objects of any size divisible by
> sizeof(uintptr_t).
> > And it would be silly to use a mempool to hold objects smaller than
> > sizeof(uintptr_t).
> >
> > How does the performance look if you multiply the index by
> > sizeof(uintptr_t)?
> >
>
> Each mempool entry is cache aligned, so we can use that if we want a
> bigger
> multiplier.
Thanks for chiming in, Bruce.
Please also read this discussion about the multiplier:
http://inbox.dpdk.org/dev/CALBAE1PrQYyOG96f6ECeW1vPF3TOh1h7MZZULiY95z9xjbRuyA@mail.gmail.com/
next prev parent reply other threads:[~2022-01-07 11:29 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-30 17:27 [dpdk-dev] [RFC] " Dharmik Thakkar
2021-10-01 12:36 ` Jerin Jacob
2021-10-01 15:44 ` Honnappa Nagarahalli
2021-10-01 17:32 ` Jerin Jacob
2021-10-01 17:57 ` Honnappa Nagarahalli
2021-10-01 18:21 ` Jerin Jacob
2021-10-01 21:30 ` Ananyev, Konstantin
2021-10-02 0:07 ` Honnappa Nagarahalli
2021-10-02 18:51 ` Ananyev, Konstantin
2021-10-04 16:36 ` Honnappa Nagarahalli
2021-10-30 10:23 ` Morten Brørup
2021-10-31 8:14 ` Morten Brørup
2021-11-03 15:12 ` Dharmik Thakkar
2021-11-03 15:52 ` Morten Brørup
2021-11-04 4:42 ` Dharmik Thakkar
2021-11-04 8:04 ` Morten Brørup
2021-11-08 4:32 ` Honnappa Nagarahalli
2021-11-08 7:22 ` Morten Brørup
2021-11-08 15:29 ` Honnappa Nagarahalli
2021-11-08 15:39 ` Morten Brørup
2021-11-08 15:46 ` Honnappa Nagarahalli
2021-11-08 16:03 ` Morten Brørup
2021-11-08 16:47 ` Jerin Jacob
2021-12-24 22:59 ` [PATCH 0/1] " Dharmik Thakkar
2021-12-24 22:59 ` [PATCH 1/1] " Dharmik Thakkar
2022-01-11 2:26 ` Ananyev, Konstantin
2022-01-13 5:17 ` Dharmik Thakkar
2022-01-13 10:37 ` Ananyev, Konstantin
2022-01-19 15:32 ` Dharmik Thakkar
2022-01-21 11:25 ` Ananyev, Konstantin
2022-01-21 11:31 ` Ananyev, Konstantin
2022-03-24 19:51 ` Dharmik Thakkar
2021-12-25 0:16 ` [PATCH 0/1] " Morten Brørup
2022-01-07 11:15 ` Bruce Richardson
2022-01-07 11:29 ` Morten Brørup [this message]
2022-01-07 13:50 ` Bruce Richardson
2022-01-08 9:37 ` Morten Brørup
2022-01-10 6:38 ` Jerin Jacob
2022-01-13 5:31 ` Dharmik Thakkar
2023-07-06 17:43 ` Stephen Hemminger
2023-07-31 12:23 ` Thomas Monjalon
2023-07-31 12:33 ` Morten Brørup
2023-07-31 14:57 ` Dharmik Jayesh Thakkar
2022-01-13 5:36 ` [PATCH v2 " Dharmik Thakkar
2022-01-13 5:36 ` [PATCH v2 1/1] " Dharmik Thakkar
2022-01-13 10:18 ` Jerin Jacob
2022-01-20 8:21 ` Morten Brørup
2022-01-21 6:01 ` Honnappa Nagarahalli
2022-01-21 7:36 ` Morten Brørup
2022-01-24 13:05 ` Ray Kinsella
2022-01-21 9:12 ` Bruce Richardson
2022-01-23 7:13 ` Wang, Haiyue
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