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From: Ilias Apalodimas <ilias.apalodimas@linaro.org>
To: Yunsheng Lin <linyunsheng@huawei.com>
Cc: Matteo Croce <mcroce@linux.microsoft.com>,
	Marcin Wojtas <mw@semihalf.com>,
	"Russell King (Oracle)" <linux@armlinux.org.uk>,
	Sven Auhagen <sven.auhagen@voleatech.de>,
	David Miller <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	linuxarm@openeuler.org, yisen.zhuang@huawei.com,
	salil.mehta@huawei.com,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Jesper Dangaard Brouer <hawk@kernel.org>,
	Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	John Fastabend <john.fastabend@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Will Deacon <will@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Vlastimil Babka <vbabka@suse.cz>,
	Fenghua Yu <fenghua.yu@intel.com>, Roman Gushchin <guro@fb.com>,
	Peter Xu <peterx@redhat.com>,
	feng.tang@intel.com, Jason Gunthorpe <jgg@ziepe.ca>,
	Matteo Croce <mcroce@microsoft.com>,
	Hugh Dickins <hughd@google.com>,
	Jonathan Lemon <jonathan.lemon@gmail.com>,
	Alexander Lobakin <alobakin@pm.me>,
	Willem de Bruijn <willemb@google.com>, wenxu <wenxu@ucloud.cn>,
	Cong Wang <cong.wang@bytedance.com>,
	Kevin Hao <haokexin@gmail.com>,
	Aleksandr Nogikh <nogikh@google.com>,
	Marco Elver <elver@google.com>,
	netdev@vger.kernel.org,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	bpf@vger.kernel.org
Subject: Re: [PATCH net-next RFC 0/2] add elevated refcnt support for page pool
Date: Fri, 9 Jul 2021 09:42:30 +0300	[thread overview]
Message-ID: <YOfv1vHcZPBvyfaN@enceladus> (raw)
In-Reply-To: <14a92860-67cc-b2ac-efba-dd482f03204b@huawei.com>

On Fri, Jul 09, 2021 at 02:40:02PM +0800, Yunsheng Lin wrote:
> On 2021/7/9 12:15, Matteo Croce wrote:
> > On Wed, Jul 7, 2021 at 6:50 PM Marcin Wojtas <mw@semihalf.com> wrote:
> >>
> >> Hi,
> >>
> >>
> >> ??r., 7 lip 2021 o 01:20 Matteo Croce <mcroce@linux.microsoft.com> napisa??(a):
> >>>
> >>> On Tue, Jul 6, 2021 at 5:51 PM Russell King (Oracle)
> >>> <linux@armlinux.org.uk> wrote:
> >>>>
> >>>> On Fri, Jul 02, 2021 at 03:39:47PM +0200, Matteo Croce wrote:
> >>>>> On Wed, 30 Jun 2021 17:17:54 +0800
> >>>>> Yunsheng Lin <linyunsheng@huawei.com> wrote:
> >>>>>
> >>>>>> This patchset adds elevated refcnt support for page pool
> >>>>>> and enable skb's page frag recycling based on page pool
> >>>>>> in hns3 drvier.
> >>>>>>
> >>>>>> Yunsheng Lin (2):
> >>>>>>   page_pool: add page recycling support based on elevated refcnt
> >>>>>>   net: hns3: support skb's frag page recycling based on page pool
> >>>>>>
> >>>>>>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.c    |  79 +++++++-
> >>>>>>  drivers/net/ethernet/hisilicon/hns3/hns3_enet.h    |   3 +
> >>>>>>  drivers/net/ethernet/hisilicon/hns3/hns3_ethtool.c |   1 +
> >>>>>>  drivers/net/ethernet/marvell/mvneta.c              |   6 +-
> >>>>>>  drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c    |   2 +-
> >>>>>>  include/linux/mm_types.h                           |   2 +-
> >>>>>>  include/linux/skbuff.h                             |   4 +-
> >>>>>>  include/net/page_pool.h                            |  30 ++-
> >>>>>>  net/core/page_pool.c                               | 215
> >>>>>> +++++++++++++++++---- 9 files changed, 285 insertions(+), 57
> >>>>>> deletions(-)
> >>>>>>
> >>>>>
> >>>>> Interesting!
> >>>>> Unfortunately I'll not have access to my macchiatobin anytime soon, can
> >>>>> someone test the impact, if any, on mvpp2?
> >>>>
> >>>> I'll try to test. Please let me know what kind of testing you're
> >>>> looking for (I haven't been following these patches, sorry.)
> >>>>
> >>>
> >>> A drop test or L2 routing will be enough.
> >>> BTW I should have the macchiatobin back on friday.
> >>
> >> I have a 10G packet generator connected to 10G ports of CN913x-DB - I
> >> will stress mvpp2 in l2 forwarding early next week (I'm mostly AFK
> >> this until Monday).
> >>
> > 
> > I managed to to a drop test on mvpp2. Maybe there is a slowdown but
> > it's below the measurement uncertainty.
> > 
> > Perf top before:
> > 
> > Overhead  Shared O  Symbol
> >    8.48%  [kernel]  [k] page_pool_put_page
> >    2.57%  [kernel]  [k] page_pool_refill_alloc_cache
> >    1.58%  [kernel]  [k] page_pool_alloc_pages
> >    0.75%  [kernel]  [k] page_pool_return_skb_page
> > 
> > after:
> > 
> > Overhead  Shared O  Symbol
> >    8.34%  [kernel]  [k] page_pool_put_page
> >    4.52%  [kernel]  [k] page_pool_return_skb_page
> >    4.42%  [kernel]  [k] page_pool_sub_bias
> >    3.16%  [kernel]  [k] page_pool_alloc_pages
> >    2.43%  [kernel]  [k] page_pool_refill_alloc_cache
> 
> Hi, Matteo
> Thanks for the testing.
> it seems you have adapted the mvpp2 driver to use the new frag
> API for page pool, There is one missing optimization for XDP case,
> the page is always returned to the pool->ring regardless of the
> context of page_pool_put_page() for elevated refcnt case.
> 
> Maybe adding back that optimization will close some gap of the above
> performance difference if the drop is happening in softirq context.
> 

I think what Matteo did was a pure netstack test.  We'll need testing on
both XDP and normal network cases to be able to figure out the exact
impact.

Thanks
/Ilias
> > 
> > Regards,
> > 

      reply	other threads:[~2021-07-09  6:42 UTC|newest]

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-30  9:17 Yunsheng Lin
2021-06-30  9:17 ` [PATCH net-next RFC 1/2] page_pool: add page recycling support based on elevated refcnt Yunsheng Lin
2021-07-02  9:42   ` Jesper Dangaard Brouer
2021-07-02 10:15     ` Yunsheng Lin
2021-07-06  4:54       ` Ilias Apalodimas
2021-07-06  6:46         ` Yunsheng Lin
2021-07-06  8:18           ` Ilias Apalodimas
2021-07-06 20:45   ` Alexander Duyck
2021-07-07  3:05     ` Yunsheng Lin
2021-07-07 15:01       ` Alexander Duyck
2021-07-07 19:03         ` Ilias Apalodimas
2021-07-07 21:49           ` Alexander Duyck
2021-07-08 14:21             ` Ilias Apalodimas
2021-07-08 14:24               ` Alexander Duyck
2021-07-08 14:50                 ` Ilias Apalodimas
2021-07-08 15:17                   ` Ilias Apalodimas
2021-07-08 15:29                     ` Alexander Duyck
2021-07-08 15:36                       ` Ilias Apalodimas
2021-07-08 15:41                         ` Alexander Duyck
2021-07-08 15:47                           ` Ilias Apalodimas
2021-07-08  2:27         ` Yunsheng Lin
2021-07-08 15:36           ` Alexander Duyck
2021-07-09  6:26             ` Yunsheng Lin
2021-07-09 14:15               ` Alexander Duyck
2021-07-10  9:16                 ` [Linuxarm] " Yunsheng Lin
2021-06-30  9:17 ` [PATCH net-next RFC 2/2] net: hns3: support skb's frag page recycling based on page pool Yunsheng Lin
2021-07-02  8:36 ` [PATCH net-next RFC 0/2] add elevated refcnt support for " Ilias Apalodimas
2021-07-02 13:39 ` Matteo Croce
2021-07-06 15:51   ` Russell King (Oracle)
2021-07-06 23:19     ` Matteo Croce
2021-07-07 16:50       ` Marcin Wojtas
2021-07-09  4:15         ` Matteo Croce
2021-07-09  6:40           ` Yunsheng Lin
2021-07-09  6:42             ` Ilias Apalodimas [this message]

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