netdev - Re: [PATCH 0/3]: net: dsa: mt7530: support MT7530 in the MT7621 SoC

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Date:   Tue, 11 Dec 2018 09:28:05 +0100
From:   Bjørn Mork <bjorn@...k.no>
To:     NeilBrown <neil@...wn.name>
Cc:     gerg@...nel.org, sean.wang@...iatek.com, andrew@...n.ch,
        vivien.didelot@...oirfairelinux.com, f.fainelli@...il.com,
        netdev@...r.kernel.org, blogic@...nwrt.org,
        René van Dorst <opensource@...rst.com>
Subject: Re: [PATCH 0/3]: net: dsa: mt7530: support MT7530 in the MT7621 SoC

NeilBrown <neil@...wn.name> writes:

> I got your patch working on 4.20-rc5 and did a performance comparison.
> With the staging driver (using iperf3) I get
>   220 MBit/sec in
>   680 MBit/sec out
>
> with the patched mainline driver I get
>   190 MBit/sec in
>    93 MBit/sec out
>
> (numbers are a bit rubbery, but within 10%)
>
> I haven't looked into why this might be, but thought I would mention it.
>
> Strangely when I test with scp, I get about 10MB/sec in both directions
> with both drivers.  Maybe the CPU limits encryption speed.
>
> I have a 4.4-based kernel where I get 940MBit/sec both ways - using a
> precursor of the current staging driver.

Yes, thanks for bringing this up. I should have mentioned that I haven't
considered performance at all yet.


Bjørn