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From: Jakub Kicinski <kuba@kernel.org>
To: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Cc: moyufeng <moyufeng@huawei.com>,
	Yunsheng Lin <linyunsheng@huawei.com>,
	davem@davemloft.net, 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, 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
Subject: Re: [PATCH net-next v2 4/4] net: hns3: support skb's frag page recycling based on page pool
Date: Wed, 8 Sep 2021 08:57:23 -0700	[thread overview]
Message-ID: <20210908085723.3c9c2de2@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <YTjWK1rNsYIcTt4O@apalos.home>

On Wed, 8 Sep 2021 18:26:35 +0300 Ilias Apalodimas wrote:
> > Normally I'd say put the stats in ethtool -S and the rest in debugfs
> > but I'm not sure if exposing pages_state_hold_cnt and
> > pages_state_release_cnt directly. Those are short counters, and will
> > very likely wrap. They are primarily meaningful for calculating
> > page_pool_inflight(). Given this I think their semantics may be too
> > confusing for an average ethtool -S user.
> > 
> > Putting all the information in debugfs seems like a better idea.  
> 
> I can't really disagree on the aforementioned stats being confusing.
> However at some point we'll want to add more useful page_pool stats (e.g the
> percentage of the page/page fragments that are hitting the recycling path).
> Would it still be 'ok' to have info split across ethtool and debugfs?

Possibly. We'll also see what Alex L comes up with for XDP stats. Maybe
we can arrive at a netlink API for standard things (broken record).

You said percentage - even tho I personally don't like it - there is a
small precedent of ethtool -S containing non-counter information (IOW
not monotonically increasing event counters), e.g. some vendors rammed
PCI link quality in there. So if all else fails ethtool -S should be
fine.

  reply	other threads:[~2021-09-08 15:57 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06  2:46 [PATCH net-next v2 0/4] add frag page support in " Yunsheng Lin
2021-08-06  2:46 ` [PATCH net-next v2 1/4] page_pool: keep pp info as long as page pool owns the page Yunsheng Lin
2021-08-06  2:46 ` [PATCH net-next v2 2/4] page_pool: add interface to manipulate frag count in page pool Yunsheng Lin
2021-08-10 14:58   ` Jesper Dangaard Brouer
2021-08-11  0:48     ` Yunsheng Lin
2021-08-12 15:17   ` Jesper Dangaard Brouer
2021-08-06  2:46 ` [PATCH net-next v2 3/4] page_pool: add frag page recycling support " Yunsheng Lin
2021-08-06  2:46 ` [PATCH net-next v2 4/4] net: hns3: support skb's frag page recycling based on " Yunsheng Lin
2021-09-08  8:31   ` moyufeng
2021-09-08 15:08     ` Jakub Kicinski
2021-09-08 15:26       ` Ilias Apalodimas
2021-09-08 15:57         ` Jakub Kicinski [this message]
2021-09-08 16:47           ` Jesper Dangaard Brouer
2021-09-08 16:51           ` Ilias Apalodimas
2021-08-10 14:01 ` [PATCH net-next v2 0/4] add frag page support in " Jakub Kicinski
2021-08-10 14:23   ` Jesper Dangaard Brouer
2021-08-10 14:43     ` Jakub Kicinski
2021-08-10 15:09       ` Alexander Duyck
2021-08-11  1:06         ` [Linuxarm] " Yunsheng Lin

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