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From: David Ahern <dsahern@gmail.com>
To: Yunsheng Lin <linyunsheng@huawei.com>,
	davem@davemloft.net, kuba@kernel.org
Cc: alexander.duyck@gmail.com, linux@armlinux.org.uk,
	mw@semihalf.com, linuxarm@openeuler.org, yisen.zhuang@huawei.com,
	salil.mehta@huawei.com, thomas.petazzoni@bootlin.com,
	hawk@kernel.org, ilias.apalodimas@linaro.org, ast@kernel.org,
	daniel@iogearbox.net, john.fastabend@gmail.com,
	akpm@linux-foundation.org, peterz@infradead.org, will@kernel.org,
	willy@infradead.org, vbabka@suse.cz, fenghua.yu@intel.com,
	guro@fb.com, peterx@redhat.com, feng.tang@intel.com,
	jgg@ziepe.ca, mcroce@microsoft.com, hughd@google.com,
	jonathan.lemon@gmail.com, alobakin@pm.me, willemb@google.com,
	wenxu@ucloud.cn, cong.wang@bytedance.com, haokexin@gmail.com,
	nogikh@google.com, elver@google.com, yhs@fb.com,
	kpsingh@kernel.org, andrii@kernel.org, kafai@fb.com,
	songliubraving@fb.com, netdev@vger.kernel.org,
	linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
	chenhao288@hisilicon.com, edumazet@google.com,
	yoshfuji@linux-ipv6.org, dsahern@kernel.org, memxor@gmail.com,
	linux@rempel-privat.de, atenart@kernel.org, weiwan@google.com,
	ap420073@gmail.com, arnd@arndb.de,
	mathew.j.martineau@linux.intel.com, aahringo@redhat.com,
	ceggers@arri.de, yangbo.lu@nxp.com, fw@strlen.de,
	xiangxia.m.yue@gmail.com, linmiaohe@huawei.com
Subject: Re: [PATCH RFC 0/7] add socket to netdev page frag recycling support
Date: Wed, 18 Aug 2021 16:05:52 -0600	[thread overview]
Message-ID: <83b8bae8-d524-36a1-302e-59198410d9a9@gmail.com> (raw)
In-Reply-To: <1629257542-36145-1-git-send-email-linyunsheng@huawei.com>

On 8/17/21 9:32 PM, Yunsheng Lin wrote:
> This patchset adds the socket to netdev page frag recycling
> support based on the busy polling and page pool infrastructure.
> 
> The profermance improve from 30Gbit to 41Gbit for one thread iperf
> tcp flow, and the CPU usages decreases about 20% for four threads
> iperf flow with 100Gb line speed in IOMMU strict mode.
> 
> The profermance improve about 2.5% for one thread iperf tcp flow
> in IOMMU passthrough mode.
> 

Details about the test setup? cpu model, mtu, any other relevant changes
/ settings.

How does that performance improvement compare with using the Tx ZC API?
At 1500 MTU I see a CPU drop on the Tx side from 80% to 20% with the ZC
API and ~10% increase in throughput. Bumping the MTU to 3300 and
performance with the ZC API is 2x the current model with 1/2 the cpu.

Epyc 7502, ConnectX-6, IOMMU off.

In short, it seems like improving the Tx ZC API is the better path
forward than per-socket page pools.

  parent reply	other threads:[~2021-08-18 22:06 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-18  3:32 Yunsheng Lin
2021-08-18  3:32 ` [PATCH RFC 1/7] page_pool: refactor the page pool to support multi alloc context Yunsheng Lin
2021-08-18  3:32 ` [PATCH RFC 2/7] skbuff: add interface to manipulate frag count for tx recycling Yunsheng Lin
2021-08-18  3:32 ` [PATCH RFC 3/7] net: add NAPI api to register and retrieve the page pool ptr Yunsheng Lin
2021-08-18  3:32 ` [PATCH RFC 4/7] net: pfrag_pool: add pfrag pool support based on page pool Yunsheng Lin
2021-08-18  3:32 ` [PATCH RFC 5/7] sock: support refilling pfrag from pfrag_pool Yunsheng Lin
2021-08-18  3:32 ` [PATCH RFC 6/7] net: hns3: support tx recycling in the hns3 driver Yunsheng Lin
2021-08-18  8:57 ` [PATCH RFC 0/7] add socket to netdev page frag recycling support Eric Dumazet
2021-08-18  9:36   ` Yunsheng Lin
2021-08-23  9:25     ` [Linuxarm] " Yunsheng Lin
2021-08-23 15:04       ` Eric Dumazet
2021-08-24  8:03         ` Yunsheng Lin
2021-08-25 16:29         ` David Ahern
2021-08-25 16:32           ` Eric Dumazet
2021-08-25 16:38             ` David Ahern
2021-08-25 17:24               ` Eric Dumazet
2021-08-26  4:05                 ` David Ahern
2021-08-18 22:05 ` David Ahern [this message]
2021-08-19  8:18   ` Yunsheng Lin
2021-08-20 14:35     ` David Ahern
2021-08-23  3:32       ` Yunsheng Lin
2021-08-24  3:34         ` David Ahern
2021-08-24  8:41           ` Yunsheng Lin

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