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

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Message-ID: <20230607065809.GB5025@thinkpad>
Date:   Wed, 7 Jun 2023 12:28:09 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Jeffrey Hugo <quic_jhugo@...cinc.com>
Cc:     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 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.
> > 
> > Below is the comparision:
> > 
> > iperf on the UL channel with 16K MTU:
> > 
> > [ ID] Interval       Transfer     Bandwidth
> > [  3]  0.0-10.0 sec   353 MBytes   296 Mbits/sec
> > 
> > iperf on the UL channel with 32K MTU:
> > 
> > [ ID] Interval       Transfer     Bandwidth
> > [  3]  0.0-10.0 sec   695 MBytes   583 Mbits/sec
> > 
> > Cc: Loic Poulain <loic.poulain@...aro.org>
> > Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> > ---
> >   drivers/net/mhi_net.c | 2 +-
> >   1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c
> > index 3d322ac4f6a5..eddc2c701da4 100644
> > --- a/drivers/net/mhi_net.c
> > +++ b/drivers/net/mhi_net.c
> > @@ -14,7 +14,7 @@
> >   #define MHI_NET_MIN_MTU		ETH_MIN_MTU
> >   #define MHI_NET_MAX_MTU		0xffff
> > -#define MHI_NET_DEFAULT_MTU	0x4000
> > +#define MHI_NET_DEFAULT_MTU	0x8000
> 
> Why not SZ_32K?

Makes sense. Will change it in next iteration.

- Mani

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