netdev - Re: [PATCH net-next] net/core: add optional threading for backlog processing

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Message-ID: <20230327190629.7e966f46@kernel.org>
Date:   Mon, 27 Mar 2023 19:06:29 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Felix Fietkau <nbd@....name>
Cc:     netdev@...r.kernel.org, Jonathan Corbet <corbet@....net>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next] net/core: add optional threading for backlog
 processing

On Sat, 25 Mar 2023 06:42:43 +0100 Felix Fietkau wrote:
> >> In my tests it brings down latency (both avg and p99) considerably in
> >> some cases. I posted some numbers here:
> >> https://lore.kernel.org/netdev/e317d5bc-cc26-8b1b-ca4b-66b5328683c4@nbd.name/  
> > 
> > Could you provide the full configuration for this test?
> > In non-threaded mode the RPS is enabled to spread over remaining
> > 3 cores? 
> 
> In this test I'm using threaded NAPI and backlog_threaded without any 
> fixed core assignment.

I was asking about the rps_threaded=0 side of the comparison.
So you're saying on that side you were using threaded NAPI with 
no pinning and RPS across all cores?