brcmfmac experiment for a specific use case - tx throughput maximization for slow CPU with glomming

Commit Message

Fabio Estevam Aug. 18, 2017, 11:50 a.m. UTC

Hi Jörg,

On Thu, Jun 1, 2017 at 3:37 AM, Jörg Krause <[e-mail]> wrote:

> I'm experiencing low throughput with a BCM43362 wifi chip attached via
> SDIO to an i.MX28 [1,2]. After disabling some Kernel debug features I'm
> getting now a TCP throughput of 12.5 Mbps for the wifi interface, which
> is still below the throughput I get for the Cubietruck.

Does it help if you disable CONFIG_PROVE_LOCKING?

Comments

Jörg Krause Aug. 21, 2017, 6:09 p.m. UTC | #1

Hi Fabio,

On Fri, 2017-08-18 at 08:50 -0300, Fabio Estevam wrote:
> Hi Jörg,
> 
> On Thu, Jun 1, 2017 at 3:37 AM, Jörg Krause <[e-mail]> wrote:
> 
> > I'm experiencing low throughput with a BCM43362 wifi chip attached via
> > SDIO to an i.MX28 [1,2]. After disabling some Kernel debug features I'm
> > getting now a TCP throughput of 12.5 Mbps for the wifi interface, which
> > is still below the throughput I get for the Cubietruck.
> 
> Does it help if you disable CONFIG_PROVE_LOCKING?

No, it does not. I've disabled all settings in "Lock Debugging", but
the TCP throughput is still at ~12.5 Mpbs.

> --- a/arch/arm/configs/mxs_defconfig
> +++ b/arch/arm/configs/mxs_defconfig
> @@ -175,7 +175,6 @@ CONFIG_MAGIC_SYSRQ=y
>  CONFIG_DEBUG_KERNEL=y
>  CONFIG_LOCKUP_DETECTOR=y
>  CONFIG_TIMER_STATS=y
> -CONFIG_PROVE_LOCKING=y
>  CONFIG_BLK_DEV_IO_TRACE=y
>  CONFIG_STRICT_DEVMEM=y
>  CONFIG_DEBUG_USER=y

Patch

--- a/arch/arm/configs/mxs_defconfig
+++ b/arch/arm/configs/mxs_defconfig
@@ -175,7 +175,6 @@  CONFIG_MAGIC_SYSRQ=y
 CONFIG_DEBUG_KERNEL=y
 CONFIG_LOCKUP_DETECTOR=y
 CONFIG_TIMER_STATS=y
-CONFIG_PROVE_LOCKING=y
 CONFIG_BLK_DEV_IO_TRACE=y
 CONFIG_STRICT_DEVMEM=y
 CONFIG_DEBUG_USER=y