From: "lihuisong (C)" <lihuisong@huawei.com>
To: Ferruh Yigit <ferruh.yigit@amd.com>,
Dongdong Liu <liudongdong3@huawei.com>, <dev@dpdk.org>,
<thomas@monjalon.net>, <andrew.rybchenko@oktetlabs.ru>
Cc: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
Ruifeng Wang <ruifeng.wang@arm.com>, haijie <haijie1@huawei.com>
Subject: Re: [PATCH 3/5] net/hns3: optimize free mbuf code for SVE Tx
Date: Tue, 26 Sep 2023 12:03:21 +0800 [thread overview]
Message-ID: <7af8f26a-2327-eb6a-d204-564b66880972@huawei.com> (raw)
In-Reply-To: <8a469b5d-6047-4123-ad47-6416385b0de9@amd.com>
在 2023/9/25 22:21, Ferruh Yigit 写道:
> On 7/11/2023 11:24 AM, Dongdong Liu wrote:
>> From: Huisong Li <lihuisong@huawei.com>
>>
>> Currently, hns3 SVE Tx checks the valid bits of all descriptors
>> in a batch and then determines whether to release the corresponding
>> mbufs. Actually, once the valid bit of any descriptor in a batch
>> isn't cleared, driver does not need to scan the rest of descriptors.
>>
>> If we optimize SVE codes algorithm about this function, the performance
>> of a single queue for 64B packet is improved by ~2% on txonly forwarding
>> mode. And if use C code to scan all descriptors, the performance is
>> improved by ~8%.
>>
>> So this patch selects C code to optimize this code to improve the SVE
>> Tx performance.
>>
>> Signed-off-by: Huisong Li <lihuisong@huawei.com>
>> Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
>>
> SVE Tx optimized by removing SVE implementation :)
Yes. I didn't remove it, TBH. but I have no other idea.😂
>
> Do you have any insight why generic vector implementation is faster?
I guess the number of instructions for this SVE code block is greater
than C code with scanning one by one.
But If the burst size is bigger, such as 128 and more, the SVE
performance can be enhanced a little.
>
>
>
> .
next prev parent reply other threads:[~2023-09-26 4:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-07-11 10:24 [PATCH 0/5] net/hns3: some performance optimizations Dongdong Liu
2023-07-11 10:24 ` [PATCH 1/5] net/hns3: fix incorrect index to look up table in NEON Rx Dongdong Liu
2023-07-11 12:58 ` Ferruh Yigit
2023-07-11 10:24 ` [PATCH 2/5] net/hns3: fix the order of NEON Rx code Dongdong Liu
2023-07-11 10:24 ` [PATCH 3/5] net/hns3: optimize free mbuf code for SVE Tx Dongdong Liu
2023-09-25 14:21 ` Ferruh Yigit
2023-09-26 4:03 ` lihuisong (C) [this message]
2023-07-11 10:24 ` [PATCH 4/5] net/hns3: optimize the rearm mbuf function for SVE Rx Dongdong Liu
2023-07-11 10:24 ` [PATCH 5/5] net/hns3: optimize SVE Rx performance Dongdong Liu
2023-07-11 10:48 ` [PATCH 0/5] net/hns3: some performance optimizations Ferruh Yigit
2023-07-11 11:27 ` Dongdong Liu
2023-07-11 12:26 ` Ferruh Yigit
2023-09-25 14:26 ` Ferruh Yigit
2023-09-25 2:33 ` Jie Hai
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