Marvell 88W8897 wifi throughput

[sns]

    recently when we use the chip 88w8897 ,we found that there were some probles abuot the wifi,the topo is as follows:
             88w8897))))))))wirelessrouter))))))))88w8897
we have two devices which use the chip,when we test the throughput between the two devices, we found some probles:
1.the throughput of upload is much lower than the download,at the idel environment,the upload throughput is about 200Mbps but the download throughput is 350Mbps.
2.when we restart the device and test the throughput between the two devices,the upload throughput is very low at the first time,then it gos up to the normal value slowly,sometimes it can't, the value is between 1mbps to 10mbps.

so i want to know how can i fix the two probles,can you help me.

our platform is linux(arm64) ,kernel is 4.4.16 ,the motherboard is rk3399

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1706290

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[sns (shanghaiwangyong)]

we can not use the command apport-collect 1706290 .

[Joseph Salisbury (jsalisbury)]

Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.13 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.13-rc2

[sns (shanghaiwangyong)]

kernel-bug-exists-upstream

it happens that many users have the same problem with the chip of 88w8897.
Is it possible for compatibility reasons？
Or because of the RF circuit caused.