netdev - Re: [PATCH net-next v4] net: skb: introduce and use a single page frag cache

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Message-ID: <4d710ac16e549225e0802657733ce4f773e632de.camel@redhat.com>
Date:   Wed, 05 Oct 2022 09:33:11 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Eric Dumazet <edumazet@...gle.com>
Cc:     patchwork-bot+netdevbpf@...nel.org,
        netdev <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexander Duyck <alexanderduyck@...com>
Subject: Re: [PATCH net-next v4] net: skb: introduce and use a single page
 frag cache

On Mon, 2022-10-03 at 15:30 -0700, Eric Dumazet wrote:
> I was using neper ( https://github.com/google/neper ), with 100
> threads and 4000 flows.
> 
> I suspect contention is hard to see unless you use a host with at
> least 128 cores.
> Also you need a lot of NIC receive queues (or use RPS to spread
> incoming packets to many cores)

Nice tool! It looks like it can load the host very easily.

I still can't observe the regression on my H/W but I see some minor
improvement with the proposed patch, FWIW.

I'll try to look for an host with more cores, but that can take a lot
to unlimited time.

> 
Cheers,

Paolo