linux-kernel - Re: [PATCH net-next v3 0/6] page_pool: a couple of assorted optimizations

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Message-ID: <bf553c4a-2f31-9a92-77e9-7670b062e768@intel.com>
Date:   Fri, 4 Aug 2023 16:31:05 +0200
From:   Alexander Lobakin <aleksander.lobakin@...el.com>
To:     Jakub Kicinski <kuba@...nel.org>
CC:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        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>,
        Simon Horman <simon.horman@...igine.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v3 0/6] page_pool: a couple of assorted
 optimizations

From: Jakub Kicinski <kuba@...nel.org>
Date: Thu, 3 Aug 2023 18:21:21 -0700

> On Thu,  3 Aug 2023 20:20:32 +0200 Alexander Lobakin wrote:
>> That initially was a spin-off of the IAVF PP series[0], but has grown
>> (and shrunk) since then a bunch. In fact, it consists of three
>> semi-independent blocks:
>>
>> * #1-2: Compile-time optimization. Split page_pool.h into 2 headers to
>>   not overbloat the consumers not needing complex inline helpers and
>>   then stop including it in skbuff.h at all. The first patch is also
>>   prereq for the whole series.
>> * #3: Improve cacheline locality for users of the Page Pool frag API.
>> * #4-6: Use direct cache recycling more aggressively, when it is safe
>>   obviously. In addition, make sure nobody wants to use Page Pool API
>>   with disabled interrupts.
>>
>> Patches #1 and #5 are authored by Yunsheng and Jakub respectively, with
>> small modifications from my side as per ML discussions.
>> For the perf numbers for #3-6, please see individual commit messages.
> 
> Our scheming didn't help much, the series also conflicts
> with the net/xdp.h includes which came in via bpf-next :(

Haha that happens. I rechecked everything before sending, but well, we
need a spinlock or what :D
I'll send v4 in a couple hours, so that ~22 hrs will pass since v3,
sounds okay?

Thanks,
Olek