netdev - Re: [PATCH net-next v9 2/4] ethtool: provide customized dim profile management

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Date: Sun, 21 Apr 2024 08:53:53 -0700
From: Brett Creeley <bcreeley@....com>
To: Heng Qi <hengqi@...ux.alibaba.com>, netdev@...r.kernel.org,
 virtualization@...ts.linux.dev
Cc: Jakub Kicinski <kuba@...nel.org>, "David S . Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Paolo Abeni <pabeni@...hat.com>, Jason Wang <jasowang@...hat.com>,
 "Michael S . Tsirkin" <mst@...hat.com>,
 Ratheesh Kannoth <rkannoth@...vell.com>,
 Alexander Lobakin <aleksander.lobakin@...el.com>,
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Tal Gilboa <talgi@...dia.com>,
 Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
 Maxime Chevallier <maxime.chevallier@...tlin.com>,
 Jiri Pirko <jiri@...nulli.us>, Paul Greenwalt <paul.greenwalt@...el.com>,
 Ahmed Zaki <ahmed.zaki@...el.com>, Vladimir Oltean
 <vladimir.oltean@....com>, Kory Maincent <kory.maincent@...tlin.com>,
 Andrew Lunn <andrew@...n.ch>, "justinstitt@...gle.com"
 <justinstitt@...gle.com>
Subject: Re: [PATCH net-next v9 2/4] ethtool: provide customized dim profile
 management

On 4/17/2024 8:55 AM, Heng Qi wrote:
> Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
> 
> 
> The NetDIM library, currently leveraged by an array of NICs, delivers
> excellent acceleration benefits. Nevertheless, NICs vary significantly
> in their dim profile list prerequisites.
> 
> Specifically, virtio-net backends may present diverse sw or hw device
> implementation, making a one-size-fits-all parameter list impractical.
> On Alibaba Cloud, the virtio DPU's performance under the default DIM
> profile falls short of expectations, partly due to a mismatch in
> parameter configuration.
> 
> I also noticed that ice/idpf/ena and other NICs have customized
> profilelist or placed some restrictions on dim capabilities.
> 
> Motivated by this, I tried adding new params for "ethtool -C" that provides
> a per-device control to modify and access a device's interrupt parameters.
> 
> Usage
> ========
> The target NIC is named ethx.
> 
> Assume that ethx only declares support for ETHTOOL_COALESCE_RX_EQE_PROFILE
> in ethtool_ops->supported_coalesce_params.
> 
> 1. Query the currently customized list of the device
> 
> $ ethtool -c ethx
> ...
> rx-eqe-profile:
> {.usec =   1, .pkts = 256, .comps =   0,},
> {.usec =   8, .pkts = 256, .comps =   0,},
> {.usec =  64, .pkts = 256, .comps =   0,},
> {.usec = 128, .pkts = 256, .comps =   0,},
> {.usec = 256, .pkts = 256, .comps =   0,}
> rx-cqe-profile:   n/a
> tx-eqe-profile:   n/a
> tx-cqe-profile:   n/a
> 
> 2. Tune
> $ ethtool -C ethx rx-eqe-profile 1,1,0_2,2,0_3,3,0_4,4,0_5,5,0

With all of this work to support custom dim profiles (which I think is a 
great idea FWIW), I wonder if it would be worth supporting a dynamic 
number of profile entries instead of being hard-coded to 5?

Thanks,

Brett

<snip>