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From: Emmanuel Grumbach <egrumbach@gmail.com>
Date: Tue, 9 Jan 2018 18:42:27 +0200
Message-ID: <CANUX_P1vZnOdzBvEFw6ayagDg=-eruOdGjM1yWio_==5eUXc5Q@mail.gmail.com> (sfid-20180109_174237_184392_0F3DA084)
Subject: Re: Poor performance on 5G network with Intel 9000 series cards
To: AceLan Kao <acelan.kao@canonical.com>
Cc: linux-wireless <linux-wireless@vger.kernel.org>,
        Emily Chien <emily.chien@canonical.com>,
        William Kao <william.kao@canonical.com>,
        Anthony Wong <anthony.wong@canonical.com>
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Sender: linux-wireless-owner@vger.kernel.org

On Mon, Jan 8, 2018 at 8:34 AM, AceLan Kao <acelan.kao@canonical.com> wrote:
>
> Hi all,
>
> Forgot to append the device info, here it is.
>
> 02:00.0 Network controller [0280]: Intel Corporation Device [8086:2526] (rev 29)
>         Subsystem: Intel Corporation Device [8086:4010]
>
> Best regards,
> AceLan Kao.
>
> 2018-01-08 14:25 GMT+08:00 AceLan Kao <acelan.kao@canonical.com>:
> > Hi all,
> >
> > We found that Intel 9000 series wifi cards have tx performance issue
> > on 5G network.
> > Here are the test result.
> >
> > Client(10.101.46.25) is the platform with 9260 wifi card on 5G
> > network, and server(10.101.46.219) is another machine with ethernet
> > network.
> >

I think this matches this bug:
https://bugzilla.kernel.org/show_bug.cgi?id=198351

> > kernel v4.15-rc5 with firmware API 33
> >
> > acelan@u-Kabylake-Client-platform ~ % iperf -c 10.101.46.219 -er
> > ------------------------------------------------------------
> > Server listening on TCP port 5001 with pid 2248
> > Read buffer size: 1.44 KByte
> > TCP window size: 85.3 KByte (default)
> > ------------------------------------------------------------
> > ------------------------------------------------------------
> > Client connecting to 10.101.46.219, TCP port 5001 with pid 2248
> > Write buffer size: 128 KByte
> > TCP window size: 85.0 KByte (default)
> > ------------------------------------------------------------
> > [ 5] local 10.101.46.25 port 54308 connected with 10.101.46.219 port 5001
> > [ ID] Interval Transfer Bandwidth Write/Err Rtry Cwnd/RTT
> > [ 5] 0.00-11.06 sec 7.75 MBytes 5.88 Mbits/sec 1/0 77 7K/165143 us
> > [ 4] local 10.101.46.25 port 5001 connected with 10.101.46.219 port 38816
> > [ ID] Interval Transfer Bandwidth Reads Dist(bin=0.2K)
> > [ 4] 0.00-10.31 sec 77.0 MBytes 62.7 Mbits/sec 55729
> > 49:23:176:59:1140:294:168:53820
> >
> > ------------------------------------------------------------
> >
> > With firmware API 34, no luck
> >
> > acelan@u-Kabylake-Client-platform ~ % iperf -c 10.101.46.219 -er
> > ------------------------------------------------------------
> > Server listening on TCP port 5001 with pid 2138
> > Read buffer size: 1.44 KByte
> > TCP window size: 85.3 KByte (default)
> > ------------------------------------------------------------
> > ------------------------------------------------------------
> > Client connecting to 10.101.46.219, TCP port 5001 with pid 2138
> > Write buffer size: 128 KByte
> > TCP window size: 187 KByte (default)
> > ------------------------------------------------------------
> > [ 5] local 10.101.46.25 port 43560 connected with 10.101.46.219 port 5001
> > [ ID] Interval Transfer Bandwidth Write/Err Rtry Cwnd/RTT
> > [ 5] 0.00-10.01 sec 896 KBytes 733 Kbits/sec 1/0 58 7K/140474 us
> > [ 4] local 10.101.46.25 port 5001 connected with 10.101.46.219 port 38844
> > [ ID] Interval Transfer Bandwidth Reads Dist(bin=0.2K)
> > [ 4] 0.00-10.11 sec 79.8 MBytes 66.2 Mbits/sec 57744
> > 37:6:191:52:1236:413:143:55666
> >
> > Any ideas?
> >
> > Best regards,
> > AceLan Kao.