netdev - Re: [PATCH net-next v2 05/10] net: qualcomm: rmnet: Set pacing rate

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Date:   Thu, 04 Jan 2018 15:43:28 -0700
From:   Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     davem@...emloft.net, netdev@...r.kernel.org, lkp@...el.com
Subject: Re: [PATCH net-next v2 05/10] net: qualcomm: rmnet: Set pacing rate

>> The real device over which the rmnet devices are installed also
>> aggregate multiple IP packets and sends them as a single large 
>> aggregate
>> frame to the hardware.
> 
> It would be nice to give some details about this in the changelog.
> 
> Also what results you get with different values for the shift (10, 9,
> 8)
> 
> My fear is that people might be tempted to blindly use the
> sk_pacing_shift_update() just because a single TCP flow gets 'better'
> results.
> 
> bufferbloat is a serious issue, we do not want to allow a single TCP
> flow to fill a fifo.
> 
> Otherwise, we could remove TCP Small queues overhead from the kernel
> and be happy.
> 
> Thanks.

The test was run with iperf single stream TCP TX for a duration of 30s.

Pacing shift | Observed data rate (Mbps)
           10 | 9
           9  | 140
           8  | 146

I will update all of this in the commit text in v3.

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