netdev - Re: [EXT] [PATCH] aquantia: Remove the build

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Date:   Mon, 23 Nov 2020 04:20:31 +0000
From:   "Ramsay, Lincoln" <Lincoln.Ramsay@...i.com>
To:     Igor Russkikh <irusskikh@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "Dmitry Bogdanov [C]" <dbogdanov@...vell.com>
Subject: Re: [EXT] [PATCH] aquantia: Remove the build_skb path

> Yep, that could be the only way to fix this for now.
> Have you tried to estimate any performance drops from this?

Unfortunately, I am not in a very good position to do this. The 10G interfaces on our device don't actually have enough raw PCI bandwidth available to hit 10G transfer rates.

I did use iperf3 and saw bursts over 2Gbit/sec (with average closer to 1.3Gbit/sec on a good run). There was no significant difference between running with and without the patch. I am told that this is about as good as can be expected.

Make of that what you will :)

Lincoln