netdev - Re: [PATCH] rtl8xxxu: disable interrupt_in transfer for 8188cu and 8192cu

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Message-ID: <876caa77-702c-eb29-bfd1-c2ebcc4fb641@reto-schneider.ch>
Date:   Mon, 5 Jul 2021 02:35:35 +0200
From:   Reto Schneider <code@...o-schneider.ch>
To:     chris.chiu@...onical.com, Jes.Sorensen@...il.com,
        kvalo@...eaurora.org, davem@...emloft.net, kuba@...nel.org
Cc:     linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtl8xxxu: disable interrupt_in transfer for 8188cu and
 8192cu

On 01.07.21 18:33, chris.chiu@...onical.com wrote:
> There will be crazy numbers of interrupts triggered by 8188cu and
> 8192cu module, around 8000~10000 interrupts per second, on the usb
> host controller. Compare with the vendor driver source code, it's
> mapping to the configuration CONFIG_USB_INTERRUPT_IN_PIPE and it is
> disabled by default.
> 
> Since the interrupt transfer is neither used for TX/RX nor H2C
> commands. Disable it to avoid the confusing interrupts for the
> 8188cu and 8192cu module which I only have for verification.

I tested the new code on the GARDENA smart gateway and it works as 
expected. Interrupts are greatly reduced while the same level of TX/RX 
performance could be measured as before the change: A (too) high 
percentage of retransmissions, but otherwise fine.

Tested-by: reto.schneider@...qvarnagroup.com

Kind regards,
Reto