Re: [RFC PATCH 00/30] Kernel NET policy

From: Tom Herbert
Date: Mon Jul 18 2016 - 12:35:32 EST

On Mon, Jul 18, 2016 at 5:51 PM, Liang, Kan <kan.liang@xxxxxxxxx> wrote:
>> >
>> > It is a big challenge to get good network performance. First, the
>> > network performance is not good with default system settings. Second,
>> > it is too difficult to do automatic tuning for all possible workloads,
>> > since workloads have different requirements. Some workloads may want
>> high throughput.
>> Seems you did lots of tests to find optimal settings for a given base policy.
> Yes. Current test only base on Intel i40e driver. The optimal settings should
> vary for other devices. But adding settings for new device is not hard.
The optimal settings are very dependent on system architecture (NUMA
config, #cpus, memory, etc.) and sometimes kernel version as well. A
database that provides best configurations across different devices,
architectures, and kernel version might be interesting; but beware
that that is a whole bunch of work to maintain, Either way policy like
this really should be handled in userspace.