Linux/TMDSEVM572X: Low throughput issue

Poojitha S

Part Number: TMDSEVM572X

Tool/software: Linux

Hi,

We have am57xx board with wilink wifi module. Throughput values measured with iperf tool gives 11-12Mbps. We followed the below mentioned link which suggested in changing the interrupt mode from polling so that the throughput will be increased.

https://e2e.ti.com/support/arm/sitara_arm/f/791/p/639301/2377267?tisearch=e2e-sitesearch&keymatch=omap_hsmmc.c#2377267

The changes in omap_hsmmc.c were already part of our code. But added the device-tree necessities for interrupt mode in the file am57xxbeagle-x15.dts and recompiled the kernel. But there was no improvement in the throughput. As well as there was no change the dtb file. But directory structure is not same as mentioned in the link. '/sys/kernel/mmc2/regs' file is not present. Instead, it is present in this place '/sys/kernel/debug/mmc2/regs'. And the interrupt mode remained 'polling'.

root@am57xx-evm:~# cat /sys/kernel/debug/mmc2/regs
mmc2:
sdio irq mode polling
ctx_loss: 1

regs:
CON: 0x00000600
PSTATE: 0x01f00000
HCTL: 0x00000b02
SYSCTL: 0x000d0047
IE: 0x00000000
ISE: 0x00000000
CAPA: 0x24e10080

Can you tell us what else needs to be changed so that our throughput will increase to a certain extent.

over 7 years ago

0 Cvetolin Shulev-XID over 7 years ago

TI__Guru 65405 points

Hi Poojitha,

Could you specify what SW release and Linux kernel version you are using?

BR
Tsvetolin Shulev

0 Poojitha S over 7 years ago in reply to Cvetolin Shulev-XID

Prodigy 60 points

Hi Tsvetolin Shulev,

Linux kernel version:

Linux am57xx-evm 4.4.32-rt41-ge26c84b0ac #4 SMP PREEMPT RT Mon Feb 26 04:13:01 EST 2018 armv7l GNU/Linux

SW release of wlcore:

PHY firmware version: Rev 8.2.0.0.232
wlcore: firmware booted (Rev 8.9.0.0.48)

0 Steve Kipisz over 7 years ago in reply to Poojitha S

TI__Genius 15510 points

Which wilink module are you using? I'll try to replicate here.

Steve K.

0 Poojitha S over 7 years ago in reply to Steve Kipisz

Prodigy 60 points

Hi,

WiLink details:

WiLink8.0 module WL1837MOD

Part number: TMDSEVM572X

Thanks,

Poojitha

0 Poojitha S over 7 years ago in reply to Poojitha S

Prodigy 60 points

Hi Steve Kipisz/Tsvetolin Shulev,

Any update on this? Please let us know what can be done to increase the throughput.

0 Steve Kipisz over 7 years ago in reply to Poojitha S

TI__Genius 15510 points

I have reached out to the Wilink team for their help.

Steve K.

0 Steve Kipisz over 7 years ago in reply to Steve Kipisz

TI__Genius 15510 points

It seems the Wilink team is already looking at a similar issue e2e.ti.com/.../2479415

Steve K.

0 Poojitha S over 7 years ago in reply to Steve Kipisz

Prodigy 60 points

Ok. But can you let us know how to change the mode from polling to interrupt mode? Following the above mentioned link did not give us the expected results.

0 Hari Nagalla over 7 years ago in reply to Poojitha S

TI__Mastermind 27080 points

Is the AM557x with WL8 configured as STA or AP? Are these throughput numbers with UDP or TCP? Also, what is the mode and channel number used?

Thanks

0 Poojitha S over 7 years ago in reply to Hari Nagalla

Prodigy 60 points

It is configured in AP mode. The throughput results are in TCP mode. UDP mode gives better throughput of around 40-50Mbps.
And the channel used is 36 and hw_mode is 'a'. We are trying in 5GHz.

This is the hostapd.conf file:

interface=wlan1
driver=nl80211
ssid=abcd1
channel=36
ht_capab=[HT40+][SHORT-GI-40]
macaddr_acl=0
auth_algs=1
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=12345
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
hw_mode=a
ieee80211n=1
country_code=US

Let me know if you want any further information.

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Linux/TMDSEVM572X: Low throughput issue