[ath10k throughput] low throughput in multi-user mode

[Ben Greear]

On 03/22/2018 08:21 PM, gary wrote:
>
> Hi Ben,
>
> Thank you for your reply.
> My wireless driver is compat-wireless_2017-10-6, and kernel is 4.9.58.
>
> The test result with your firmware:
> Get throughput 1.13Gbps with 16 users.
> And get almost 0 with 32 users.

Can you try an older kernel w/out backports, maybe my 4.13 or 4.9, or
some stock kernel that is a bit older?

https://github.com/greearb/linux-ct-4.9

Thanks,
Ben

>
> By my observation, in one try, ath10k_htt_rx_tx_mode_switch_ind is invoked
> only twice.
> As a result, the ath10k driver can't get the latest num_push_allowed(always
> zero).
>
> Do you have any idea of it?
>
> -----Original Message-----
> From: ath10k [mailto:ath10k-bounces at lists.infradead.org] On Behalf Of Ben
> Greear
> Sent: 2018年3月22日 0:31
> To: gary; linux-wireless at vger.kernel.org; ath10k at lists.infradead.org
> Subject: Re: [ath10k throughput] low throughput in multi-user mode
>
>
> On 03/20/2018 06:44 PM, gary wrote:
>>
>> Hi all,
>> I have run the throughput test on veriwave.(from Ethernet to wireless)
>> My AP suports 4*4, 11ac, mu-mimo.,wireless chip is QCA9984.
>> At first, the throughput is about 80Mbps only with 16 users, so I
>> force to return true in function ath10k_mac_tx_can_push().
>> As a result, when the user number is 1~16, the udp throughput is about
>> 1.2Gbps ~1.4Gbps.
>> But when the user number is 32, the udp throughput is only 520Mbps.
>>
>> So I try to substitute ath10k-firmware.
>> With firmware 10.4-3.4-0082 and above, the throughput is around 520Mbps.
>> But with firmware 10.4-3.4-0072, the throughput gets 1.1Gbps.
>>
>> Do I miss something in configuration?
>> Any comment is appreciated.
>
> What kernel version (or backports, if you are using that?) are you using?
>
> And, I'd be curious how the latest ath10k-CT (beta) firmware compares if you
> have time to try that:
>
> http://www.candelatech.com/ath10k-10.4.php
>
> At least in upload testing, we get better throughput with lots of virtual
> stations if we tune the number of tx descriptors to be larger as that will
> generate larger AMPDUs on air.
>
> You might also check your rate-ctrl logic to make sure all of your stations
> are using higher MCS rates.
>
> Thanks,
> Ben
>
> --
> Ben Greear <greearb at candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com
>
>
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-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com