Message-ID: <ce0bd9a5-e44d-b30b-3434-9d5fd36e251a@free.fr>
Date:   Tue, 21 Mar 2023 13:37:40 +0100
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Subject: Re: Performance lower than expected with BCM4359/9 on S905X2
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To:     Jerome Brunet <jbrunet@baylibre.com>,
        linux-wireless@vger.kernel.org, MMC <linux-mmc@vger.kernel.org>,
        AML <linux-amlogic@lists.infradead.org>
Cc:     Neil Armstrong <neil.armstrong@linaro.org>,
        Arend van Spriel <aspriel@gmail.com>,
        Franky Lin <franky.lin@broadcom.com>,
        Hante Meuleman <hante.meuleman@broadcom.com>,
        Kalle Valo <kvalo@kernel.org>,
        Eric Dumazet <edumazet@google.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        Pieter-Paul Giesberts <pieter-paul.giesberts@broadcom.com>,
        Alexander Prutskov <alep@cypress.com>,
        Joseph chuang <jiac@cypress.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Martin Blumenstingl <martin.blumenstingl@gmail.com>,
        Angus Ainslie <angus@akkea.ca>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Pierre-Hugues Husson <phh@phh.me>
References: <b9bd16cb-f1fa-34b7-d599-8637cbe5032b@free.fr>
 <1jh6ue74x9.fsf@starbuckisacylon.baylibre.com>
From:   Marc Gonzalez <marc.w.gonzalez@free.fr>
In-Reply-To: <1jh6ue74x9.fsf@starbuckisacylon.baylibre.com>
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Precedence: bulk

On 21/03/2023 11:46, Jerome Brunet wrote:

> On Tue 21 Mar 2023 at 11:40, Marc Gonzalez wrote:
> 
>> I've been benchmarking an Amlogic S905X2 board.
>> It provides a BCM4359/9 WiFi chip connected through SDIO.
>>
>> There's a large performance gap between vendor kernel and mainline.
>> (Downloading a 1GB file to /dev/null from a device inches away)
> 
> The title is misleading. You are comparing different sources. This is
> not a regression. This is merely a difference.

I have changed the subject line to a (hopefully) more accurate one.

> If we are talking about mainline, then which board is it ? What is the
> corresponding DT ? What is the MMC configuration in both case ? Have
> you checked you are running with the same clock configuration to begin
> with ?

Perhaps my initial request was unclear, my apologies.

I was asking whether anyone using any S905X2 board had noticed
such a performance discrepancy. (Neil seems to have provided
a full explanation for the situation.)

For what it's worth, I'm using an sei530 board, which appears
to be a minor variant of the sei510 (down to the schematics).

>> # curl -o /dev/null http://192.168.1.254:8095/fixed/1G
>>   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
>>                                  Dload  Upload   Total   Spent    Left  Speed
>> 100 1024M  100 1024M    0     0  27.5M      0  0:00:37  0:00:37 --:--:-- 28.6M
>> vs
>> 100 1024M  100 1024M    0     0  11.0M      0  0:01:32  0:01:32 --:--:-- 11.0M
>>
>> Line 1 = vendor kernel (4.9.180 amlogic android)
> 
> This cannot help identify a downstream kernel, and the infinite number
> of forks and patches associated with it.

I was not asking anyone to reproduce my exact setup.

I find it confusing that some assume there is something different
about the board I'm using. The more likely hypothesis is that all
S905X2 boards have the same behavior.

Regards