From: "Wang, Yipeng1" <yipeng1.wang@intel.com>
To: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
"Richardson, Bruce" <bruce.richardson@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
"michel@digirati.com.br" <michel@digirati.com.br>,
"Gobriel, Sameh" <sameh.gobriel@intel.com>
Subject: Re: [dpdk-dev] [PATCH v2 7/7] hash: use partial-key hashing
Date: Sat, 29 Sep 2018 00:55:13 +0000 [thread overview]
Message-ID: <D2C4A16CA39F7F4E8E384D204491D7A6614E974D@FMSMSX151.amr.corp.intel.com> (raw)
In-Reply-To: <AM6PR08MB36724DD568E5EF2E8F1BBA9A98140@AM6PR08MB3672.eurprd08.prod.outlook.com>
>-----Original Message-----
>From: Honnappa Nagarahalli [mailto:Honnappa.Nagarahalli@arm.com]
>Sent: Wednesday, September 26, 2018 9:24 PM
>To: Wang, Yipeng1 <yipeng1.wang@intel.com>; Richardson, Bruce <bruce.richardson@intel.com>
>Cc: dev@dpdk.org; michel@digirati.com.br
>Subject: RE: [PATCH v2 7/7] hash: use partial-key hashing
>
>
>> +static inline void
>> +get_buckets_index(const struct rte_hash *h, const hash_sig_t hash,
>> +uint32_t *prim_bkt, uint32_t *sec_bkt, uint16_t *sig) {
>> +/*
>> + * We use higher 16 bits of hash as the signature value stored in table.
>> + * We use the lower bits for the primary bucket
>> + * location. Then we XOR primary bucket location and the signature
>> + * to get the secondary bucket location. This is same as
>> + * proposed in Bin Fan, et al's paper
>> + * "MemC3: Compact and Concurrent MemCache with Dumber
>> Caching and
>> + * Smarter Hashing". The benefit to use
>> + * XOR is that one could derive the alternative bucket location
>> + * by only using the current bucket location and the signature.
>> + */
>> +*sig = hash >> 16;
>> +
>> +*prim_bkt = hash & h->bucket_bitmask;
>> +*sec_bkt = (*prim_bkt ^ *sig) & h->bucket_bitmask; }
>> +
>IMO, this function can be split into 2 - one for primary bucket index and another for secondary bucket index. The secondary bucket
>index calculation function can be used in functions ' rte_hash_cuckoo_move_insert_mw' and ' rte_hash_cuckoo_make_space_mw'.
>
[Wang, Yipeng] I agree that breaking them down and use function call instead of explicit code will be easier for future extension,
i.e. changing the algorithm, etc.
I split the function into 3 in V4. Please check out.
>> -/** Signature of key that is stored internally. */
>> +/**
>> + * A hash value that is used to generate signature stored in table and
>> +the
>> + * location the signature is stored.
>> + */
>This is an external file. This documentation goes into the API guide. IMO, we should change the comment to help the user. How about
>changing this to 'hash value of the key'?
>
[Wang, Yipeng] Improved in V4. Please check! Thanks!
next prev parent reply other threads:[~2018-09-29 0:55 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-06 17:09 [dpdk-dev] [PATCH v1 0/5] hash: add extendable bucket and " Yipeng Wang
2018-09-06 17:09 ` [dpdk-dev] [PATCH v1 1/5] test: fix bucket size in hash table perf test Yipeng Wang
2018-09-06 17:09 ` [dpdk-dev] [PATCH v1 2/5] test: more accurate hash table perf test output Yipeng Wang
2018-09-06 17:09 ` [dpdk-dev] [PATCH v1 3/5] hash: add extendable bucket feature Yipeng Wang
2018-09-06 17:09 ` [dpdk-dev] [PATCH v1 4/5] test: implement extendable bucket hash test Yipeng Wang
2018-09-06 17:09 ` [dpdk-dev] [PATCH v1 5/5] hash: use partial-key hashing Yipeng Wang
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 0/7] hash: add extendable bucket and partial key hashing Yipeng Wang
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 1/7] test/hash: fix bucket size in hash perf test Yipeng Wang
2018-09-26 10:04 ` Bruce Richardson
2018-09-27 3:39 ` Wang, Yipeng1
2018-09-27 4:23 ` Honnappa Nagarahalli
2018-09-29 0:31 ` Wang, Yipeng1
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 2/7] test/hash: more accurate hash perf test output Yipeng Wang
2018-09-26 10:07 ` Bruce Richardson
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 3/7] test/hash: fix rw test with non-consecutive cores Yipeng Wang
2018-09-26 11:02 ` Bruce Richardson
2018-09-27 3:40 ` Wang, Yipeng1
2018-09-26 11:13 ` Bruce Richardson
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 4/7] hash: fix unnecessary code Yipeng Wang
2018-09-26 12:55 ` Bruce Richardson
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 5/7] hash: add extendable bucket feature Yipeng Wang
2018-09-27 4:23 ` Honnappa Nagarahalli
2018-09-27 11:15 ` Bruce Richardson
2018-09-27 11:27 ` Ananyev, Konstantin
2018-09-27 12:27 ` Bruce Richardson
2018-09-27 12:33 ` Ananyev, Konstantin
2018-09-27 19:21 ` Honnappa Nagarahalli
2018-09-28 17:35 ` Wang, Yipeng1
2018-09-29 21:09 ` Honnappa Nagarahalli
2018-09-29 1:10 ` Wang, Yipeng1
2018-10-01 20:56 ` Honnappa Nagarahalli
2018-10-02 1:56 ` Wang, Yipeng1
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 6/7] test/hash: implement extendable bucket hash test Yipeng Wang
2018-09-27 4:24 ` Honnappa Nagarahalli
2018-09-29 0:50 ` Wang, Yipeng1
2018-09-21 17:17 ` [dpdk-dev] [PATCH v2 7/7] hash: use partial-key hashing Yipeng Wang
2018-09-27 4:24 ` Honnappa Nagarahalli
2018-09-29 0:55 ` Wang, Yipeng1 [this message]
2018-09-26 12:57 ` [dpdk-dev] [PATCH v2 0/7] hash: add extendable bucket and partial key hashing Bruce Richardson
2018-09-27 3:41 ` Wang, Yipeng1
2018-09-27 4:23 ` Honnappa Nagarahalli
2018-09-29 0:46 ` Wang, Yipeng1
2018-09-26 12:54 ` [dpdk-dev] [PATCH v3 0/5] hash: fix multiple issues Yipeng Wang
2018-09-26 12:54 ` [dpdk-dev] [PATCH v3 1/5] test/hash: fix bucket size in hash perf test Yipeng Wang
2018-09-27 11:17 ` Bruce Richardson
2018-09-26 12:54 ` [dpdk-dev] [PATCH v3 2/5] test/hash: more accurate hash perf test output Yipeng Wang
2018-09-26 12:54 ` [dpdk-dev] [PATCH v3 3/5] test/hash: fix rw test with non-consecutive cores Yipeng Wang
2018-09-27 11:18 ` Bruce Richardson
2018-09-26 12:54 ` [dpdk-dev] [PATCH v3 4/5] test/hash: fix missing file in meson build file Yipeng Wang
2018-09-27 11:22 ` Bruce Richardson
2018-09-26 12:54 ` [dpdk-dev] [PATCH v3 5/5] hash: fix unused define Yipeng Wang
2018-09-28 14:11 ` [dpdk-dev] [PATCH v4 0/5] hash: fix multiple issues Yipeng Wang
2018-09-28 14:11 ` [dpdk-dev] [PATCH v4 1/5] test/hash: fix bucket size in hash perf test Yipeng Wang
2018-10-01 20:28 ` Honnappa Nagarahalli
2018-09-28 14:11 ` [dpdk-dev] [PATCH v4 2/5] test/hash: more accurate hash perf test output Yipeng Wang
2018-09-28 14:11 ` [dpdk-dev] [PATCH v4 3/5] test/hash: fix rw test with non-consecutive cores Yipeng Wang
2018-09-28 14:11 ` [dpdk-dev] [PATCH v4 4/5] test/hash: fix missing file in meson build file Yipeng Wang
2018-09-28 14:11 ` [dpdk-dev] [PATCH v4 5/5] hash: fix unused define Yipeng Wang
2018-10-25 22:04 ` [dpdk-dev] [PATCH v4 0/5] hash: fix multiple issues Thomas Monjalon
2018-09-26 20:26 ` [dpdk-dev] [PATCH v3 0/3] hash: add extendable bucket and partial key hashing Yipeng Wang
2018-09-26 20:26 ` [dpdk-dev] [PATCH v3 1/3] hash: add extendable bucket feature Yipeng Wang
2018-09-26 20:26 ` [dpdk-dev] [PATCH v3 2/3] test/hash: implement extendable bucket hash test Yipeng Wang
2018-09-26 20:26 ` [dpdk-dev] [PATCH v3 3/3] hash: use partial-key hashing Yipeng Wang
2018-09-28 17:23 ` [dpdk-dev] [PATCH v4 0/4] hash: add extendable bucket and partial key hashing Yipeng Wang
2018-09-28 17:23 ` [dpdk-dev] [PATCH v4 1/4] hash: fix race condition in iterate Yipeng Wang
2018-10-01 20:23 ` Honnappa Nagarahalli
2018-10-02 0:17 ` Wang, Yipeng1
2018-10-02 4:26 ` Honnappa Nagarahalli
2018-10-02 23:53 ` Wang, Yipeng1
2018-09-28 17:23 ` [dpdk-dev] [PATCH v4 2/4] hash: add extendable bucket feature Yipeng Wang
2018-10-02 3:58 ` Honnappa Nagarahalli
2018-10-02 23:39 ` Wang, Yipeng1
2018-10-03 4:37 ` Honnappa Nagarahalli
2018-10-03 15:08 ` Stephen Hemminger
2018-10-03 15:08 ` Stephen Hemminger
2018-10-03 16:53 ` Wang, Yipeng1
2018-10-03 17:59 ` Honnappa Nagarahalli
2018-10-04 1:22 ` Wang, Yipeng1
2018-09-28 17:23 ` [dpdk-dev] [PATCH v4 3/4] test/hash: implement extendable bucket hash test Yipeng Wang
2018-10-01 19:53 ` Honnappa Nagarahalli
2018-09-28 17:23 ` [dpdk-dev] [PATCH v4 4/4] hash: use partial-key hashing Yipeng Wang
2018-10-01 20:09 ` Honnappa Nagarahalli
2018-10-03 19:05 ` [dpdk-dev] [PATCH v4 0/4] hash: add extendable bucket and partial key hashing Dharmik Thakkar
2018-10-01 18:34 ` [dpdk-dev] [PATCH v5 " Yipeng Wang
2018-10-01 18:34 ` [dpdk-dev] [PATCH v5 1/4] hash: fix race condition in iterate Yipeng Wang
2018-10-02 17:26 ` Honnappa Nagarahalli
2018-10-01 18:35 ` [dpdk-dev] [PATCH v5 2/4] hash: add extendable bucket feature Yipeng Wang
2018-10-01 18:35 ` [dpdk-dev] [PATCH v5 3/4] test/hash: implement extendable bucket hash test Yipeng Wang
2018-10-01 18:35 ` [dpdk-dev] [PATCH v5 4/4] hash: use partial-key hashing Yipeng Wang
2018-10-02 20:52 ` Dharmik Thakkar
2018-10-03 0:43 ` Wang, Yipeng1
2018-10-03 19:10 ` [dpdk-dev] [PATCH v5 0/4] hash: add extendable bucket and partial key hashing Dharmik Thakkar
2018-10-04 0:36 ` Wang, Yipeng1
2018-10-04 16:35 ` [dpdk-dev] [PATCH v6 " Yipeng Wang
2018-10-04 16:35 ` [dpdk-dev] [PATCH v6 1/4] hash: fix race condition in iterate Yipeng Wang
2018-10-04 16:35 ` [dpdk-dev] [PATCH v6 2/4] hash: add extendable bucket feature Yipeng Wang
2018-10-04 16:35 ` [dpdk-dev] [PATCH v6 3/4] test/hash: implement extendable bucket hash test Yipeng Wang
2018-10-04 16:35 ` [dpdk-dev] [PATCH v6 4/4] hash: use partial-key hashing Yipeng Wang
2018-10-10 21:27 ` [dpdk-dev] [PATCH v7 0/4] hash: add extendable bucket and partial key hashing Yipeng Wang
2018-10-10 21:27 ` [dpdk-dev] [PATCH v7 1/4] hash: fix race condition in iterate Yipeng Wang
2018-10-10 21:27 ` [dpdk-dev] [PATCH v7 2/4] hash: add extendable bucket feature Yipeng Wang
2018-10-10 21:27 ` [dpdk-dev] [PATCH v7 3/4] test/hash: implement extendable bucket hash test Yipeng Wang
2018-10-10 21:27 ` [dpdk-dev] [PATCH v7 4/4] hash: use partial-key hashing Yipeng Wang
2018-10-16 18:47 ` [dpdk-dev] [PATCH] doc: update release note for hash library Yipeng Wang
2018-10-17 20:09 ` Honnappa Nagarahalli
2018-10-25 18:45 ` Wang, Yipeng1
2018-10-25 23:07 ` Thomas Monjalon
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