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Date: Fri, 1 Dec 2023 15:37:43 +0100
From: Alexander Lobakin <>
To: Yunsheng Lin <>
CC: Christoph Hellwig <>, Paul Menzel <>,
	Maciej Fijalkowski <>, Jesper Dangaard Brouer
	<>, Larysa Zaremba <>,
	<>, Alexander Duyck <>, "Ilias
 Apalodimas" <>, <>,
	Eric Dumazet <>, Michal Kubiak <>,
	<>, David Christensen
	<>, Jakub Kicinski <>, Paolo Abeni
	<>, "David S. Miller" <>
Subject: Re: [Intel-wired-lan] [PATCH net-next v5 03/14] page_pool: avoid
 calling no-op externals when possible

From: Yunsheng Lin <>
Date: Thu, 30 Nov 2023 20:20:44 +0800

> On 2023/11/30 19:58, Alexander Lobakin wrote:
>> From: Yunsheng Lin <>
>> Date: Thu, 30 Nov 2023 16:46:11 +0800
>>> On 2023/11/29 21:17, Alexander Lobakin wrote:
>>>> From: Yunsheng Lin <>
>>>> Date: Wed, 29 Nov 2023 11:17:50 +0800
>>>>> On 2023/11/27 22:32, Alexander Lobakin wrote:
>>>>>> Chris, any thoughts on a global flag for skipping DMA syncs ladder?
>>>>> It seems there was one already in the past:
>>>> It addresses a different problem, meaningless indirect calls, while this
>>>> one addresses meaningless direct calls :>
>>>> When the above gets merged, we could combine these two into one global,
>>>> but Eric wasn't active with his patch and I remember there were some
>>>> problems, so I wouldn't count on that it will arrive soon.
>>> I went through the above patch, It seems to me that there was no
>>> fundamental problem that stopping us from implementing it in the dma
>>> layer basing on Eric' patch if Eric is no longer interested in working
>>> on a newer version?
>> I'm somewhat interested in continuing working on Eric's patch, but not
>> now. Have some urgent projects to work on, I could take this in January
>> I guess...
>> This PP-specific shortcut was done earlier and gives good boosts. It
>> would be trivial to remove it together with the XSk shortcut once a
>> generic both indirect and direct call DMA shortcut lands.
>> Does this sounds good / justified enough? Or you and other
>> reviewers/maintainers would prefer to wait for the generic one without
>> taking this patch?
> I would prefer we could wait for the generic one as there is only about one
> month between now and january:)

Ok, let's do it this way. I'll try to revive Eric's idea soon and get it
taken if he doesn't mind :>


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