[Bug 215475] RMNET data connection speed would be reduced to about 80-100Mb/s from 150Mb/s if try to re-connect it

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=215475

--- Comment #3 from Greg Kroah-Hartman (greg@kroah.com) ---
On Wed, Jan 12, 2022 at 08:03:34AM +0000, bugzilla-daemon@bugzilla.kernel.org
wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=215475
> 
> --- Comment #2 from slark_xiao@163.com ---
> Hi Greg,
>   Yes, it also happen on 5.16. I tried it with 5.16-rc8.
> 
>   May I know what do you mean of 'usb trances'? USB protocol analyzer log or
> tcpdump packages?

USB protocol analyzer log is best, to compare the data streams.

>   Actually, I do the same test with another Qualcomm modem device (not the
>   same
> serials), and issue can't be reproduced with that device. Seems issue comes
> from firmware of device. But we can't explain the difference beween Windows
> and
> Linux.

Then please contact the vendor that wrote the firmware, they can help
you out the best with this.

good luck!

greg k-h

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