[PATCH v2] ath10k: Increase AST table SKID length limit

[Salakava Jegadeesan, Senthil]

This fix is specific to ath10K driver + 10.x firmware combinations. This has been tested extensively, didn't observe the mentioned issue.

Thanks,
Senthil J

-----Original Message-----
From: Ben Greear [mailto:greearb at candelatech.com] 
Sent: Thursday, February 19, 2015 1:53 AM
To: Salakava Jegadeesan, Senthil
Cc: ath10k at lists.infradead.org; linux-wireless at vger.kernel.org
Subject: Re: [PATCH v2] ath10k: Increase AST table SKID length limit

Have you tried testing this with 30+ stations associated and streaming data, and with other traffic on nearby channels (say, channel 1 and 6)?

We see bad performance drop-off when we set number-of-peers above
100 (with CT firmware).  My kernel will set AST skid limit to number-of-peers + number-of-vdevs.

Performance is best at 32 peers or less (so skid is about 40).

I am wondering if the root cause is firmware/hardware walking the full skid-length for pkts from un-associated peers on same (or neighbouring) channels, or maybe unlucky hash distribution in existing peers?

Thanks,
Ben


On 02/13/2015 07:36 AM, SenthilKumar Jegadeesan wrote:
> The current SKID length configuration causes firmware to reject peer 
> creation for not able to allocate AST entries for peers. This issue is 
> observed when least significant 3 bytes are used ramdomly to create 
> client MAC addresses.
> 
> AST table SKID length configuration is increased to maximum value to 
> fix this issue.
> 
> Signed-off-by: SenthilKumar Jegadeesan <sjegadee at qti.qualcomm.com>
> ---
>  drivers/net/wireless/ath/ath10k/hw.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/ath/ath10k/hw.h 
> b/drivers/net/wireless/ath/ath10k/hw.h
> index 460771f..7f04645 100644
> --- a/drivers/net/wireless/ath/ath10k/hw.h
> +++ b/drivers/net/wireless/ath/ath10k/hw.h
> @@ -223,7 +223,7 @@ struct ath10k_pktlog_hdr {
>  #define TARGET_10X_NUM_WDS_ENTRIES		32
>  #define TARGET_10X_DMA_BURST_SIZE		0
>  #define TARGET_10X_MAC_AGGR_DELIM		0
> -#define TARGET_10X_AST_SKID_LIMIT		16
> +#define TARGET_10X_AST_SKID_LIMIT		128
>  #define TARGET_10X_NUM_STATIONS			128
>  #define TARGET_10X_NUM_PEERS			((TARGET_10X_NUM_STATIONS) + \
>  						 (TARGET_10X_NUM_VDEVS))
> --
> 1.9.1
> 
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--
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com