linux-kernel - Re: [PATCH 3/3] net: mhi: Increase the default MTU from 16K to 32K

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Message-ID: <20230607145637.GA103098@thinkpad>
Date:   Wed, 7 Jun 2023 20:26:37 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Jeffrey Hugo <quic_jhugo@...cinc.com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org
Subject: Re: [PATCH 3/3] net: mhi: Increase the default MTU from 16K to 32K

On Wed, Jun 07, 2023 at 02:25:50PM +0200, Andrew Lunn wrote:
> On Wed, Jun 07, 2023 at 12:28:09PM +0530, Manivannan Sadhasivam wrote:
> > On Tue, Jun 06, 2023 at 07:50:23AM -0600, Jeffrey Hugo wrote:
> > > On 6/6/2023 6:31 AM, Manivannan Sadhasivam wrote:
> > > > Most of the Qualcomm endpoint devices are supporting 32K MTU for the
> > > > UL (Uplink) and DL (Downlink) channels. So let's use the same value
> > > > in the MHI NET driver also. This gives almost 2x increase in the throughput
> > > > for the UL channel.
> 
> You say here 'Most'. What happens on those which do not support 32K?
> Do the packets get dropped and it turns into a black hole?
> 

Yeah, and the host has to retransmit. But I checked again with Qcom on the MTU
size and got a different answer that forced me to change "most" to "few". So
this patch is not needed for now. I'll drop it.

- Mani

>    Andrew
> 

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