From: "Toke Høiland-Jørgensen" <toke@toke.dk> To: Wen Gong <wgong@codeaurora.org>, ath10k@lists.infradead.org, johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org Subject: Re: [PATCH 2/2] ath10k: Set sk_pacing_shift to 6 for 11AC WiFi chips Date: Thu, 26 Jul 2018 13:45:43 +0200 [thread overview] Message-ID: <87zhye1aqg.fsf@toke.dk> (raw) In-Reply-To: <1532589677-16428-3-git-send-email-wgong@codeaurora.org> Wen Gong <wgong@codeaurora.org> writes: > Upstream kernel has an interface to help adjust sk_pacing_shift to help > improve TCP UL throughput. > The sk_pacing_shift is 8 in mac80211, this is based on test with 11N > WiFi chips with ath9k. For QCA6174/QCA9377 PCI 11AC chips, the 11AC > VHT80 TCP UL throughput testing result shows 6 is the optimal. > Overwrite the sk_pacing_shift to 6 in ath10k driver. When I tested this, a pacing shift of 8 was quite close to optimal as well for ath10k. Why are you getting different results? > Tested with QCA6174 PCI with firmware > WLAN.RM.4.4.1-00109-QCARMSWPZ-1, but this will also affect QCA9377 PCI. > It's not a regression with new firmware releases. > > There have 2 test result of different settings: > > ARM CPU based device with QCA6174A PCI with different > sk_pacing_shift: > > sk_pacing_shift throughput(Mbps) CPU utilization > 6 500(-P5) ~75% idle, Focus on CPU1: ~14%idle > 7 454(-P5) ~80% idle, Focus on CPU1: ~4%idle > 8 288 ~90% idle, Focus on CPU1: ~35%idle > 9 ~200 ~92% idle, Focus on CPU1: ~50%idle Your tests do not include latency values; please try running a test that also measures latency. The tcp_nup test in Flent (https://flent.org) will do that, for instance. Also, is this a single TCP flow? -Toke
WARNING: multiple messages have this Message-ID (diff)
From: "Toke Høiland-Jørgensen" <toke@toke.dk> To: Wen Gong <wgong@codeaurora.org>, ath10k@lists.infradead.org, johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org Subject: Re: [PATCH 2/2] ath10k: Set sk_pacing_shift to 6 for 11AC WiFi chips Date: Thu, 26 Jul 2018 13:45:43 +0200 [thread overview] Message-ID: <87zhye1aqg.fsf@toke.dk> (raw) In-Reply-To: <1532589677-16428-3-git-send-email-wgong@codeaurora.org> Wen Gong <wgong@codeaurora.org> writes: > Upstream kernel has an interface to help adjust sk_pacing_shift to help > improve TCP UL throughput. > The sk_pacing_shift is 8 in mac80211, this is based on test with 11N > WiFi chips with ath9k. For QCA6174/QCA9377 PCI 11AC chips, the 11AC > VHT80 TCP UL throughput testing result shows 6 is the optimal. > Overwrite the sk_pacing_shift to 6 in ath10k driver. When I tested this, a pacing shift of 8 was quite close to optimal as well for ath10k. Why are you getting different results? > Tested with QCA6174 PCI with firmware > WLAN.RM.4.4.1-00109-QCARMSWPZ-1, but this will also affect QCA9377 PCI. > It's not a regression with new firmware releases. > > There have 2 test result of different settings: > > ARM CPU based device with QCA6174A PCI with different > sk_pacing_shift: > > sk_pacing_shift throughput(Mbps) CPU utilization > 6 500(-P5) ~75% idle, Focus on CPU1: ~14%idle > 7 454(-P5) ~80% idle, Focus on CPU1: ~4%idle > 8 288 ~90% idle, Focus on CPU1: ~35%idle > 9 ~200 ~92% idle, Focus on CPU1: ~50%idle Your tests do not include latency values; please try running a test that also measures latency. The tcp_nup test in Flent (https://flent.org) will do that, for instance. Also, is this a single TCP flow? -Toke _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k
next prev parent reply other threads:[~2018-07-26 13:02 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-07-26 7:21 [PATCH 0/2] Change sk_pacing_shift in ieee80211_hw for best tx throughput Wen Gong 2018-07-26 7:21 ` Wen Gong 2018-07-26 7:21 ` [PATCH 1/2] mac80211: Save sk_pacing_shift to ieee80211_hw Wen Gong 2018-07-26 7:21 ` Wen Gong 2018-07-26 14:52 ` kbuild test robot 2018-07-26 14:52 ` kbuild test robot 2018-07-27 8:35 ` Wen Gong 2018-07-27 8:35 ` Wen Gong 2018-07-27 9:30 ` Kalle Valo 2018-07-27 9:30 ` Kalle Valo 2018-07-26 7:21 ` [PATCH 2/2] ath10k: Set sk_pacing_shift to 6 for 11AC WiFi chips Wen Gong 2018-07-26 7:21 ` Wen Gong 2018-07-26 11:45 ` Toke Høiland-Jørgensen [this message] 2018-07-26 11:45 ` Toke Høiland-Jørgensen 2018-07-26 13:02 ` Michał Kazior 2018-07-26 13:02 ` Michał Kazior 2018-07-27 9:39 ` Wen Gong 2018-07-27 9:39 ` Wen Gong 2018-07-27 12:33 ` Michał Kazior 2018-07-27 12:33 ` Michał Kazior 2018-07-27 9:29 ` Wen Gong 2018-07-27 9:29 ` Wen Gong 2018-07-27 20:06 ` Toke Høiland-Jørgensen 2018-07-27 20:06 ` Toke Høiland-Jørgensen -- strict thread matches above, loose matches on Subject: below -- 2018-07-26 7:16 [PATCH 0/2] Change sk_pacing_shift in ieee80211_hw for best tx throughput Wen Gong 2018-07-26 7:16 ` [PATCH 2/2] ath10k: Set sk_pacing_shift to 6 for 11AC WiFi chips Wen Gong 2018-07-26 7:16 ` Wen Gong
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