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

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在 2024/4/21 下午11:53, Brett Creeley 写道:
On 4/17/2024 8:55 AM, Heng Qi wrote:
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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?


In my practice, I have not found that fewer or more profile entries lead to better performance.

Thanks.

Thanks,

Brett

<snip>





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