netdev - Re: [patch 0/3] net, refcount: Address dst_entry reference count scalability issues

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Date:   Wed, 01 Mar 2023 11:40:11 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Eric Dumazet <edumazet@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Torvalds <torvalds@...uxfoundation.org>, x86@...nel.org,
        Wangyang Guo <wangyang.guo@...el.com>,
        Arjan van De Ven <arjan@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Marc Zyngier <maz@...nel.org>
Subject: Re: [patch 0/3] net, refcount: Address dst_entry reference count
 scalability issues

On Tue, Feb 28 2023 at 19:17, Jakub Kicinski wrote:
> FWIW looks good to me, especially the refcount part.
> We do see 10% of jitter in microbenchmarks due to random cache
> effects, so forgive the questioning.

Yes, those things are hard to measure. 

> But again, the refcount seems like an obvious win to my noob eyes.
>
> While I have you it would be remiss of me not to mention my ksoftirq
> change which makes a large difference in production workloads:
> https://lore.kernel.org/all/20221222221244.1290833-3-kuba@kernel.org/

Let me find this again.

> Is Peter's "rework" of softirq going in for 6.3?

Not that I'm aware of. That had a few loose ends and got lost in space
AFAICT.

Thanks,

        tglx