Re: ath10k performance, master branch from 20160407

[Xue Liu <xue.liu@dks-koeln.de>]

Hello Roman,

I am also working on the 10k testing with armada 388 + QCA9880 and 
OpenWRT trunk (compat-wireless 20160110).


On 08/04/16 18:00, Roman Yeryomin wrote:
> Rajkumar,
>
> I took backports from
> git://git.kernel.org/pub/scm/linux/kernel/git/backports/backports.git,
> took latest ath tree from
> git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git, generated
> backports-output based on ath master branch, refreshed openwrt
> patches.
Can you share how to refreshed openwrt patches to include latest patches 
from ath10k. I have also get backports-output from ath10k kernel, but I 
don't know how to use them. Thank you.

Regards,

Xue Liu
> And saw big performance degradation. Am I doing something wrong?
>
> Regards,
> Roman
>
> On 8 April 2016 at 18:34, Manoharan, Rajkumar <rmanohar@qti.qualcomm.com> wrote:
>> Roman,
>>
>> Which backports version are you using? I don't see codel changes in ath.git/wireless-drivers.git.
>> Hope you are using same firmware.
>>
>> -Rajkumar
>> ________________________________________
>> From: ath10k <ath10k-bounces@lists.infradead.org> on behalf of Roman Yeryomin <leroi.lists@gmail.com>
>> Sent: Friday, April 8, 2016 8:14 PM
>> To: ath10k@lists.infradead.org
>> Subject: ath10k performance, master branch from 20160407
>>
>> Hello!
>>
>> I've seen performance patches were commited so I've decided to give it
>> a try (using 4.1 kernel and backports).
>> The results are quite disappointing: TCP download (client pov) dropped
>> from 750Mbps to ~550 and UDP shows completely weird behavour - if
>> generating 900Mbps it gives 30Mbps max, if generating 300Mbps it gives
>> 250Mbps, before (latest official backports release from January) I was
>> able to get 900Mbps.
>> Hardware is basically ap152 + qca988x 3x3.
>> When running perf top I see that fq_codel_drop eats a lot of cpu.
>> Here is the output when running iperf3 UDP test:
>>
>>      45.78%  [kernel]       [k] fq_codel_drop
>>       3.05%  [kernel]       [k] ag71xx_poll
>>       2.18%  [kernel]       [k] skb_release_data
>>       2.01%  [kernel]       [k] r4k_dma_cache_inv
>>       1.73%  [kernel]       [k] eth_type_trans
>>       1.24%  [kernel]       [k] build_skb
>>       1.20%  [mac80211]     [k] ieee80211_tx_dequeue
>>       1.03%  [kernel]       [k] __delay
>>       0.98%  [kernel]       [k] fq_codel_enqueue
>>       0.94%  [kernel]       [k] __netif_receive_skb_core
>>       0.93%  [kernel]       [k] skb_release_head_state
>>       0.88%  [ath10k_core]  [k] ath10k_htt_tx
>>       0.87%  [kernel]       [k] __dev_queue_xmit
>>       0.84%  [mac80211]     [k] ieee80211_tx_status
>>       0.81%  [kernel]       [k] __build_skb
>>       0.80%  [mac80211]     [k] __ieee80211_subif_start_xmit
>>       0.77%  [kernel]       [k] br_handle_frame_finish
>>       0.75%  [kernel]       [k] __qdisc_run
>>       0.73%  [kernel]       [k] skb_recycler_consume
>>       0.72%  [kernel]       [k] kfree_skb
>>       0.72%  [kernel]       [k] get_page_from_freelist
>>       0.69%  [kernel]       [k] br_fdb_update
>>       0.69%  [kernel]       [k] br_handle_frame
>>       0.67%  [kernel]       [k] __copy_user_common
>>       0.66%  [kernel]       [k] __skb_flow_dissect
>>       0.65%  [ath10k_core]  [k] ath10k_txrx_tx_unref
>>       0.60%  [kernel]       [k] kmem_cache_alloc
>>       0.60%  [mac80211]     [k] sta_addr_hash
>>       0.56%  [kernel]       [k] fq_codel_dequeue
>>       0.53%  [kernel]       [k] __local_bh_enable_ip
>>       0.50%  [kernel]       [k] __br_fdb_get
>>
>> What could be the reason?
>> I've seen there are some patches from Michal which touch fq_codel,
>> would those help or not?
>>
>>
>> Regards,
>> Roman
>>
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