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a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1688996198; x=1720532198; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=SGQX7u4npo2HlvWnDiqxeD+J6BOLfyB5QlgSg71RnT4=; b=DXq+r7GovOeKJCvJgec8wSKovFL+0PuIE09aePPFTplx8kQG+cF9/0CT ab/vYZTAnKq5fRHn2QXFPT8B3JJIMdwIrFsLXiyprR8uLdvUhB8WQRetD /8wAXYpI1iH23krYyp1+OaI5HI5oO06hMYpHdUWfy7rBzrVCoTA2jOqBk pAcDl/UvtSoXtM8/iIIYOXQoJTlG4gGvpT2LdfqpKhlXiaHe8Ym5yhNMC IvrpUAzni32bXUexx59NRiP2kEoUEqOQCmNXNq1mGOZrhc8M6n4VAtvCQ NYGQxzDB4DbNhJNFKF0vP5z1xwqNGTCuamZpWdvNR5L7z62i6jP7tdwTC w==; X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.a=rsa-sha256 header.s=Intel header.b=DXq+r7Go X-Mailman-Original-Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Subject: Re: [Intel-wired-lan] [PATCH RFC net-next v4 6/9] iavf: switch to Page Pool X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Paul Menzel , Jesper Dangaard Brouer , Larysa Zaremba , netdev@vger.kernel.org, Alexander Duyck , Ilias Apalodimas , Eric Dumazet , linux-kernel@vger.kernel.org, Yunsheng Lin , Michal Kubiak , intel-wired-lan@lists.osuosl.org, David Christensen , Jakub Kicinski , Paolo Abeni , "David S. Miller" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" From: Yunsheng Lin Date: Sun, 9 Jul 2023 13:16:39 +0800 > On 2023/7/7 0:38, Alexander Lobakin wrote: > > ... > >>> >>>> /** >>>> @@ -766,13 +742,19 @@ void iavf_free_rx_resources(struct iavf_ring *rx_ring) >>>> **/ >>>> int iavf_setup_rx_descriptors(struct iavf_ring *rx_ring) >>>> { >>>> - struct device *dev = rx_ring->dev; >>>> - int bi_size; >>>> + struct page_pool *pool; >>>> + >>>> + pool = libie_rx_page_pool_create(&rx_ring->q_vector->napi, >>>> + rx_ring->count); >>> >>> If a page is able to be spilt between more than one desc, perhaps the >>> prt_ring size does not need to be as big as rx_ring->count. >> >> But we doesn't know in advance, right? Esp. given that it's hidden in >> the lib. But anyway, you can only assume that in regular cases if you >> always allocate frags of the same size, PP will split pages when 2+ >> frags can fit there or return the whole page otherwise, but who knows >> what might happen. > > It seems intel driver is able to know the size of memory it needs when > creating the ring/queue/napi/pp, maybe the driver only tell the libie > how many descs does it use for queue, and libie can adjust it accordingly? But libie can't say for sure how PP will split pages for it, right? > >> BTW, with recent recycling optimization, most of recycling is done >> directly through cache, not ptr_ring. So I'd even say it's safe to start >> creating smaller ptr_rings in the drivers. > > The problem is that we may use more memory than before for certain case > if we don't limit the size of ptr_ring, unless we can ensure all of > recycling is done directly through cache, not ptr_ring. Also not sure I'm following =\ [...] Thanks, Olek _______________________________________________ Intel-wired-lan mailing list Intel-wired-lan@osuosl.org https://lists.osuosl.org/mailman/listinfo/intel-wired-lan