ath10k performance, master branch from 20160407

[Manoharan, Rajkumar]

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
>
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