netdev - Re: [PATCH net-next v2] net/smc: Use percpu ref for wr tx reference

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Date:   Tue, 28 Feb 2023 19:34:45 +0800
From:   Kai <KaiShen@...ux.alibaba.com>
To:     Wenjia Zhang <wenjia@...ux.ibm.com>, kgraul@...ux.ibm.com,
        jaka@...ux.ibm.com
Cc:     kuba@...nel.org, davem@...emloft.net, netdev@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH net-next v2] net/smc: Use percpu ref for wr tx reference



On 2023/2/28 6:55 下午, Wenjia Zhang wrote:

> @Kai, the performance improvement seems not so giant, but the method 
> looks good, indeed. However, to keep the consistency of the code, I'm 
> wondering why you only use the perf_ref for wr_tx_wait, but not for 
> wr_reg_refcnt?
Didn't check the similar refcnt, my bad.
On the other hand, Our work is inspired by performance analysis, it 
seems wr_reg_refcnt is not on the IO path. It may not contribute to 
performance improvement.
And inspired by your comment, it seems we can also make the refcnt 
cdc_pend_tx_wr a perfcpu one. I will look into this.

Thanks