linux-kernel - Re: [PATCH net-next 4/4] net: hns3: support skb's frag page recycling based on page pool

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Date:   Thu, 5 Aug 2021 18:20:06 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Yunsheng Lin <linyunsheng@...wei.com>
Cc:     <davem@...emloft.net>, <alexander.duyck@...il.com>,
        <linux@...linux.org.uk>, <mw@...ihalf.com>,
        <linuxarm@...neuler.org>, <yisen.zhuang@...wei.com>,
        <salil.mehta@...wei.com>, <thomas.petazzoni@...tlin.com>,
        <hawk@...nel.org>, <ilias.apalodimas@...aro.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <john.fastabend@...il.com>,
        <akpm@...ux-foundation.org>, <peterz@...radead.org>,
        <will@...nel.org>, <willy@...radead.org>, <vbabka@...e.cz>,
        <fenghua.yu@...el.com>, <guro@...com>, <peterx@...hat.com>,
        <feng.tang@...el.com>, <jgg@...pe.ca>, <mcroce@...rosoft.com>,
        <hughd@...gle.com>, <jonathan.lemon@...il.com>, <alobakin@...me>,
        <willemb@...gle.com>, <wenxu@...oud.cn>, <cong.wang@...edance.com>,
        <haokexin@...il.com>, <nogikh@...gle.com>, <elver@...gle.com>,
        <yhs@...com>, <kpsingh@...nel.org>, <andrii@...nel.org>,
        <kafai@...com>, <songliubraving@...com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <chenhao288@...ilicon.com>
Subject: Re: [PATCH net-next 4/4] net: hns3: support skb's frag page
 recycling based on page pool

On Thu, 5 Aug 2021 19:05:26 +0800 Yunsheng Lin wrote:
> This patch adds skb's frag page recycling support based on
> the frag page support in page pool.
> 
> The performance improves above 10~20% for single thread iperf
> TCP flow with IOMMU disabled when iperf server and irq/NAPI
> have a different CPU.
> 
> The performance improves about 135%(14Gbit to 33Gbit) for single
> thread iperf TCP flow IOMMU is in strict mode and iperf server
> shares the same cpu with irq/NAPI.
> 
> Signed-off-by: Yunsheng Lin <linyunsheng@...wei.com>

This patch does not apply cleanly to net-next, please rebase 
if you're targeting that tree.