netdev - Re: [PATCH net-next v1 1/6] lan743x: boost performance on cpu archs w/o dma cache snooping

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Message-ID: <CAGngYiX6BBFPPwSaHeFqTQmERzbV-ZQHrHr_Zv4e=YCOZuc4Wg@mail.gmail.com>
Date:   Fri, 29 Jan 2021 17:49:19 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Bryan Whitehead <bryan.whitehead@...rochip.com>,
        Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>,
        David S Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexey Denisov <rtgbnm@...il.com>,
        Sergej Bauer <sbauer@...ckbox.su>,
        Tim Harvey <tharvey@...eworks.com>,
        Anders Rønningen <anders@...ningen.priv.no>,
        netdev <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next v1 1/6] lan743x: boost performance on cpu archs
 w/o dma cache snooping

Hi Andrew, thank you so much for looking at this patch !

On Fri, Jan 29, 2021 at 3:36 PM Andrew Lunn <andrew@...n.ch> wrote:
>
> So this patch appears to contain two different changes
> 1) You only allocate a receive buffer as big as the MTU plus overheads
> 2) You change the cache operations to operate on the received length.
>
> The first change should be completely safe, and i guess, is giving
> most of the benefits. The second one is where interesting things might
> happen. So please split this patch into two.  If it does break, we can
> git bisect, and probably end up on the second patch.
>

Yes, I tested this extensively on arm7, but you're right, it might behave
differently on other platforms. I will split into two, as you suggested.