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Date:   Fri, 22 Apr 2022 10:10:45 -0700
From:   Jakub Kicinski <>
To:     Eric Dumazet <>
Cc:     Eric Dumazet <>,
        "David S . Miller" <>,
        Paolo Abeni <>,
        netdev <>
Subject: Re: [PATCH net-next] net: generalize skb freeing deferral to
 per-cpu lists

On Fri, 22 Apr 2022 09:50:33 -0700 Eric Dumazet wrote:
> The thing is that with a typical number of RX queues (typically 16 or
> 32 queues on a 100Gbit NIC),
> there is enough sharding for this spinlock to be a non-issue.
> Also, we could quite easily add some batching in a future patch, for
> the cases where the number of RX queues
> is too small.
> (Each cpu could hold up to 8 or 16 skbs in a per-cpu cache, before
> giving them back to alloc_cpu(s))

I was wondering if we want to keep the per-socket queue for the
batching but you're right, per CPU batch is better anyway if needed.

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