linux-kernel - Re: [PATCH V2,net] net: mana: Fix perf regression: remove rx_cqes, tx

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Date:   Fri, 26 May 2023 08:28:19 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Haiyang Zhang <haiyangz@...rosoft.com>
Cc:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Paul Rosswurm <paulros@...rosoft.com>,
        "olaf@...fle.de" <olaf@...fle.de>,
        "vkuznets@...hat.com" <vkuznets@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "leon@...nel.org" <leon@...nel.org>,
        Long Li <longli@...rosoft.com>,
        "ssengar@...ux.microsoft.com" <ssengar@...ux.microsoft.com>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "john.fastabend@...il.com" <john.fastabend@...il.com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        Ajay Sharma <sharmaajay@...rosoft.com>,
        "hawk@...nel.org" <hawk@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "shradhagupta@...ux.microsoft.com" <shradhagupta@...ux.microsoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH V2,net] net: mana: Fix perf regression: remove rx_cqes,
 tx_cqes counters

On Fri, 26 May 2023 14:42:07 +0000 Haiyang Zhang wrote:
> > Horatiu's ask for more details was perfectly reasonable.
> > Provide more details to give the distros and users an
> > idea of the order of magnitude of the problem. Example
> > workload and relative perf hit, anything.  
> 
> For example, a workload is iperf with 128 threads, and with RPS enabled.
> We saw perf regression of 25% with the previous patch adding the counters.
> And this patch eliminates the regression. 

Exactly what I was looking for, thanks. Please put that in the commit
message and post v3 (feel free to add the review tags which came in for
v1 in the meantime).