netdev - Re: [PATCH net-next v6 05/12] net: homa: create homa_rpc.h and homa

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Message-ID: <CANn89iL2yRLEZsfuHOtZ8bgWiZVwy-=R5UVNFkc1QdYrSxF5Qg@mail.gmail.com>
Date: Wed, 29 Jan 2025 17:49:55 +0100
From: Eric Dumazet <edumazet@...gle.com>
To: John Ousterhout <ouster@...stanford.edu>
Cc: Paolo Abeni <pabeni@...hat.com>, Netdev <netdev@...r.kernel.org>, 
	Simon Horman <horms@...nel.org>, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH net-next v6 05/12] net: homa: create homa_rpc.h and homa_rpc.c

On Wed, Jan 29, 2025 at 5:44 PM John Ousterhout <ouster@...stanford.edu> wrote:
>
> GRO is implemented in the "full" Homa (and essential for decent
> performance); I left it out of this initial patch series to reduce the
> size of the patch. But that doesn't affect the cost of freeing skbs.
> GRO aggregates skb's into batches for more efficient processing, but
> the same number of skb's ends up being freed in the end.

Not at all, unless GRO is forced to use shinfo->frag_list.

GRO fast path cooks a single skb for a large payload, usually adding
as many page fragments as possible.