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Message-ID: <c0a4b430-291b-4de8-a655-2f768e95fe5e@intel.com> Date: Fri, 1 Dec 2023 15:37:43 +0100 From: Alexander Lobakin <aleksander.lobakin@...el.com> To: Yunsheng Lin <linyunsheng@...wei.com> CC: Christoph Hellwig <hch@....de>, Paul Menzel <pmenzel@...gen.mpg.de>, Maciej Fijalkowski <maciej.fijalkowski@...el.com>, Jesper Dangaard Brouer <hawk@...nel.org>, Larysa Zaremba <larysa.zaremba@...el.com>, <netdev@...r.kernel.org>, Alexander Duyck <alexanderduyck@...com>, "Ilias Apalodimas" <ilias.apalodimas@...aro.org>, <linux-kernel@...r.kernel.org>, Eric Dumazet <edumazet@...gle.com>, Michal Kubiak <michal.kubiak@...el.com>, <intel-wired-lan@...ts.osuosl.org>, David Christensen <drc@...ux.vnet.ibm.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, "David S. Miller" <davem@...emloft.net> Subject: Re: [Intel-wired-lan] [PATCH net-next v5 03/14] page_pool: avoid calling no-op externals when possible From: Yunsheng Lin <linyunsheng@...wei.com> Date: Thu, 30 Nov 2023 20:20:44 +0800 > On 2023/11/30 19:58, Alexander Lobakin wrote: >> From: Yunsheng Lin <linyunsheng@...wei.com> >> Date: Thu, 30 Nov 2023 16:46:11 +0800 >> >>> On 2023/11/29 21:17, Alexander Lobakin wrote: >>>> From: Yunsheng Lin <linyunsheng@...wei.com> >>>> 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: >>>>> >>>>> https://lore.kernel.org/netdev/7c55a4d7-b4aa-25d4-1917-f6f355bd722e@arm.com/T/ >>>> >>>> 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 :> Thanks, Olek
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