linux-kernel - Re: [PATCH RFC net-next v2 2/7] net: page_pool: place frag

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Date:   Fri, 14 Jul 2023 19:14:35 +0200
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     "David S. Miller" <davem@...emloft.net>
CC:     Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
        Larysa Zaremba <larysa.zaremba@...el.com>,
        Yunsheng Lin <linyunsheng@...wei.com>,
        Alexander Duyck <alexanderduyck@...com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        "Ilias Apalodimas" <ilias.apalodimas@...aro.org>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC net-next v2 2/7] net: page_pool: place frag_* fields
 in one cacheline

From: Alexander Lobakin <aleksander.lobakin@...el.com>
Date: Fri, 14 Jul 2023 19:08:45 +0200

> On x86_64, frag_* fields of struct page_pool are scattered across two
> cachelines despite the summary size of 24 bytes. The last field,
> ::frag_users, is pushed out to the next one, sharing it with
> ::alloc_stats.
There are two copies now of #2 and #3 as I reordered them and forgot to
remove obsolete files ._. It's an RFC anyway, so please just ignore the
duplicates. Sorry.

[...]

Thanks,
Olek