[PATCH 3/5] net/hns3: optimize free mbuf code for SVE Tx

[Ferruh Yigit]

On 7/11/2023 11:24 AM, Dongdong Liu wrote:
> From: Huisong Li <lihuisong at 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 at huawei.com>
> Signed-off-by: Dongdong Liu <liudongdong3 at huawei.com>
> 

SVE Tx optimized by removing SVE implementation :)

Do you have any insight why generic vector implementation is faster?