From: Stephen Hemminger <stephen@networkplumber.org>
To: Jerin Jacob <jerinjacobk@gmail.com>
Cc: jerinj@marvell.com, dev@dpdk.org,
Thomas Monjalon <thomas@monjalon.net>,
Ferruh Yigit <ferruh.yigit@amd.com>,
Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
ferruh.yigit@xilinx.com, ajit.khaparde@broadcom.com,
aboyer@pensando.io, beilei.xing@intel.com,
bruce.richardson@intel.com, chas3@att.com, chenbo.xia@intel.com,
ciara.loftus@intel.com, dsinghrawat@marvell.com,
ed.czeck@atomicrules.com, evgenys@amazon.com, grive@u256.net,
g.singh@nxp.com, zhouguoyang@huawei.com, haiyue.wang@intel.com,
hkalra@marvell.com, heinrich.kuhn@corigine.com,
hemant.agrawal@nxp.com, hyonkim@cisco.com, igorch@amazon.com,
irusskikh@marvell.com, jgrajcia@cisco.com,
jasvinder.singh@intel.com, jianwang@trustnetic.com,
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johndale@cisco.com, john.miller@atomicrules.com,
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kirankumark@marvell.com, oulijun@huawei.com, lironh@marvell.com,
longli@microsoft.com, mw@semihalf.com, spinler@cesnet.cz,
matan@nvidia.com, matt.peters@windriver.com,
maxime.coquelin@redhat.com, mk@semihalf.com, humin29@huawei.com,
pnalla@marvell.com, ndabilpuram@marvell.com,
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rosen.xu@intel.com, sachin.saxena@oss.nxp.com,
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shaibran@amazon.com, shepard.siegel@atomicrules.com,
asomalap@amd.com, somnath.kotur@broadcom.com,
sthemmin@microsoft.com, steven.webster@windriver.com,
skori@marvell.com, mtetsuyah@gmail.com, vburru@marvell.com,
viacheslavo@nvidia.com, xiao.w.wang@intel.com,
cloud.wangxiaoyun@huawei.com, yisen.zhuang@huawei.com,
yongwang@vmware.com, xuanziyang2@huawei.com,
cristian.dumitrescu@intel.com
Subject: Re: [dpdk-dev] [v1] ethdev: support Tx queue used count
Date: Fri, 12 Jan 2024 08:30:40 -0800 [thread overview]
Message-ID: <20240112083040.69154f06@hermes.local> (raw)
In-Reply-To: <CALBAE1P-2i0EZWnPZSLsSN1PBKmJnzY2fNeAqyhEGXZPGBm8_g@mail.gmail.com>
On Fri, 12 Jan 2024 12:31:27 +0530
Jerin Jacob <jerinjacobk@gmail.com> wrote:
> >
> > Has anyone investigated implementing dynamic tx queue limits like
> > Linux BQL?
>
> In DPDK APIs, it can expressed through creating correct TM
> topology(shaping or rate limiting) via rte_tm API
That won't work for BQL.
Byte Queue Limits measures the latency for transmit queue.
A counter is started when packets are queued to hardware and
decremented when they are done transmitting. This is then fed
back into the transmit logic; the concept is too eliminate bufferbloat
in the transmit side by providing early feedback up the stack.
Doing BQL needs a mechanism to know when packets are sent,
either in ethdev or in every device driver.
Right now it is common for applications to have very large
worse case transmit queue length (descriptors) and that introduces
latency.
next prev parent reply other threads:[~2024-01-12 16:30 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-19 17:29 [dpdk-dev] [RFC] ethdev: support Tx queue free descriptor query jerinj
2024-01-04 13:16 ` Dumitrescu, Cristian
2024-01-04 13:35 ` Jerin Jacob
2024-01-04 14:21 ` Konstantin Ananyev
2024-01-04 18:29 ` Thomas Monjalon
2024-01-05 9:57 ` Jerin Jacob
2024-01-05 10:03 ` Thomas Monjalon
2024-01-05 11:12 ` Konstantin Ananyev
2024-01-08 20:54 ` Morten Brørup
2024-01-09 14:45 ` Jerin Jacob
2024-01-04 21:17 ` Thomas Monjalon
2024-01-05 9:54 ` Jerin Jacob
2024-01-05 10:02 ` Thomas Monjalon
2024-01-08 10:54 ` Bruce Richardson
2024-01-08 21:15 ` Morten Brørup
2024-01-09 8:47 ` Bruce Richardson
2024-01-12 10:56 ` Ferruh Yigit
2024-01-11 15:17 ` [dpdk-dev] [v1] ethdev: support Tx queue used count jerinj
2024-01-11 16:17 ` Andrew Rybchenko
2024-01-12 6:56 ` Jerin Jacob
2024-01-11 16:20 ` Morten Brørup
2024-01-12 6:59 ` Jerin Jacob
2024-01-11 17:00 ` Stephen Hemminger
2024-01-12 7:01 ` Jerin Jacob
2024-01-12 16:30 ` Stephen Hemminger [this message]
2024-01-12 8:02 ` David Marchand
2024-01-12 9:29 ` Jerin Jacob
2024-01-12 11:34 ` Ferruh Yigit
2024-01-12 12:11 ` David Marchand
2024-01-12 14:25 ` Ferruh Yigit
2024-01-12 12:29 ` Morten Brørup
2024-01-12 14:29 ` Ferruh Yigit
2024-01-18 9:06 ` Jerin Jacob
2024-01-12 12:33 ` Konstantin Ananyev
2024-01-16 6:37 ` Jerin Jacob
2024-01-18 10:17 ` Konstantin Ananyev
2024-01-18 11:21 ` Jerin Jacob
2024-01-18 13:36 ` Morten Brørup
2024-01-19 9:52 ` Konstantin Ananyev
2024-01-19 10:32 ` Morten Brørup
2024-01-12 16:52 ` Stephen Hemminger
2024-01-18 9:47 ` [dpdk-dev] [v2] " jerinj
2024-01-22 13:00 ` Konstantin Ananyev
2024-01-23 11:46 ` Ferruh Yigit
2024-02-07 20:30 ` Ferruh Yigit
2024-01-29 15:03 ` Ferruh Yigit
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