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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f436c2cc-4f6f-0dc1-a343-4c41eb14935e@nbd.name>
Date:   Tue, 28 Mar 2023 11:46:03 +0200
From:   Felix Fietkau <nbd@....name>
To:     Jakub Kicinski <kuba@...nel.org>
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 28.03.23 04:06, Jakub Kicinski wrote:
> 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?
Yes.

- Felix