ath10k performance, master branch from 20160407

[Manoharan, Rajkumar]

Roman,

Need your help to bisect regression point. Can you try w/o CPTCFG_NET_SCH_FQ_CODEL?
If it does not help, try reverting below commits which are major changes in data path.
Instead of generating backports, apply revert commit on top your backports.

ath10k: combine txrx and replenish task 
ath10k: reuse copy engine 5 (htt rx) descriptors        
ath10k: cleanup copy engine receive next completion     
ath10k: register ath10k_htt_htc_t2h_msg_handler 
ath10k: speedup htt rx descriptor processing for rx_ind 
ath10k: cleanup amsdu processing for rx indication      
ath10k: remove unused fw_desc processing        
ath10k: copy tx fetch indication message        
ath10k: speedup htt rx descriptor processing for tx completion  
ath10k: fix null deref if device crashes early  
ath10k: fix pull-push tx threshold handling     
ath10k: fix tx hang     
ath10k: move mgmt descriptor limit handle under mgmt_tx 
ath10k: change htt tx desc/qcache peer limit config     
ath10k: fix HTT Tx CE ring size 
ath10k: implement push-pull tx  
ath10k: keep track of queue depth per txq       
ath10k: store txq in skb_cb
ath10k: implement updating shared htt txq state 
ath10k: implement wake_tx_queue 
ath10k: add new htt message generation/parsing logic    
ath10k: add fast peer_map lookup        
ath10k: maintain peer_id for each sta and vif   
ath10k: refactor tx pending management  
ath10k: unify txpath decision   
ath10k: refactor tx code

-Rajkumar
________________________________________
From: Roman Yeryomin <leroi.lists at gmail.com>
Sent: Friday, April 8, 2016 10:49 PM
To: Manoharan, Rajkumar
Cc: ath10k at lists.infradead.org; Rajkumar Manoharan
Subject: Re: ath10k performance, master branch from 20160407

Latest backports (compat-wireless) released (20160110) has codel
enabled (CPTCFG_NET_SCH_FQ_CODEL=y) and there are no openwrt patches
or special configuration for codel. And it runs ok.
How old commit do you want me to try?

Regards,
Roman

On 8 April 2016 at 19:41, Manoharan, Rajkumar <rmanohar at qti.qualcomm.com> wrote:
> That should be fine. Is codel running only for latest backports? Are there any openwrt changes to configure codel? Can you plz try to reset master branch to older commit and validate?
>
> -Rajkumar
> ________________________________________
> From: Roman Yeryomin [leroi.lists at gmail.com]
> Sent: Friday, April 8, 2016 9:30 PM
> To: Manoharan, Rajkumar
> Cc: ath10k at lists.infradead.org; Rajkumar Manoharan
> Subject: Re: ath10k performance, master branch from 20160407
>
> 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.
> And saw big performance degradation. Am I doing something wrong?
>
> Regards,
> Roman
>
> On 8 April 2016 at 18:34, Manoharan, Rajkumar <rmanohar at 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 at lists.infradead.org> on behalf of Roman Yeryomin <leroi.lists at gmail.com>
>> Sent: Friday, April 8, 2016 8:14 PM
>> To: ath10k at 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
>>
>> _______________________________________________
>> ath10k mailing list
>> ath10k at lists.infradead.org
>> http://lists.infradead.org/mailman/listinfo/ath10k