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From: Florian Fainelli <f.fainelli@gmail.com>
To: Rakesh Pillai <pillair@codeaurora.org>, 'Andrew Lunn' <andrew@lunn.ch>
Cc: ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
	linux-kernel@vger.kernel.org, kvalo@codeaurora.org,
	johannes@sipsolutions.net, davem@davemloft.net, kuba@kernel.org,
	netdev@vger.kernel.org, dianders@chromium.org,
	evgreen@chromium.org
Subject: Re: [RFC 0/7] Add support to process rx packets in thread
Date: Fri, 24 Jul 2020 15:28:03 -0700	[thread overview]
Message-ID: <80490faa-f9e8-3bac-a645-7458b9d6aa62@gmail.com> (raw)
In-Reply-To: <000201d66182$8989a3b0$9c9ceb10$@codeaurora.org>

On 7/23/20 11:20 PM, Rakesh Pillai wrote:
> 
> 
>> -----Original Message-----
>> From: Florian Fainelli <f.fainelli@gmail.com>
>> Sent: Friday, July 24, 2020 12:33 AM
>> To: Rakesh Pillai <pillair@codeaurora.org>; 'Andrew Lunn'
>> <andrew@lunn.ch>
>> Cc: ath10k@lists.infradead.org; linux-wireless@vger.kernel.org; linux-
>> kernel@vger.kernel.org; kvalo@codeaurora.org; johannes@sipsolutions.net;
>> davem@davemloft.net; kuba@kernel.org; netdev@vger.kernel.org;
>> dianders@chromium.org; evgreen@chromium.org
>> Subject: Re: [RFC 0/7] Add support to process rx packets in thread
>>
>> On 7/23/20 11:21 AM, Rakesh Pillai wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Florian Fainelli <f.fainelli@gmail.com>
>>>> Sent: Tuesday, July 21, 2020 11:35 PM
>>>> To: Andrew Lunn <andrew@lunn.ch>; Rakesh Pillai
>> <pillair@codeaurora.org>
>>>> Cc: ath10k@lists.infradead.org; linux-wireless@vger.kernel.org; linux-
>>>> kernel@vger.kernel.org; kvalo@codeaurora.org;
>> johannes@sipsolutions.net;
>>>> davem@davemloft.net; kuba@kernel.org; netdev@vger.kernel.org;
>>>> dianders@chromium.org; evgreen@chromium.org
>>>> Subject: Re: [RFC 0/7] Add support to process rx packets in thread
>>>>
>>>> On 7/21/20 10:25 AM, Andrew Lunn wrote:
>>>>> On Tue, Jul 21, 2020 at 10:44:19PM +0530, Rakesh Pillai wrote:
>>>>>> NAPI gets scheduled on the CPU core which got the
>>>>>> interrupt. The linux scheduler cannot move it to a
>>>>>> different core, even if the CPU on which NAPI is running
>>>>>> is heavily loaded. This can lead to degraded wifi
>>>>>> performance when running traffic at peak data rates.
>>>>>>
>>>>>> A thread on the other hand can be moved to different
>>>>>> CPU cores, if the one on which its running is heavily
>>>>>> loaded. During high incoming data traffic, this gives
>>>>>> better performance, since the thread can be moved to a
>>>>>> less loaded or sometimes even a more powerful CPU core
>>>>>> to account for the required CPU performance in order
>>>>>> to process the incoming packets.
>>>>>>
>>>>>> This patch series adds the support to use a high priority
>>>>>> thread to process the incoming packets, as opposed to
>>>>>> everything being done in NAPI context.
>>>>>
>>>>> I don't see why this problem is limited to the ath10k driver. I expect
>>>>> it applies to all drivers using NAPI. So shouldn't you be solving this
>>>>> in the NAPI core? Allow a driver to request the NAPI core uses a
>>>>> thread?
>>>>
>>>> What's more, you should be able to configure interrupt affinity to steer
>>>> RX processing onto a desired CPU core, is not that working for you
>>>> somehow?
>>>
>>> Hi Florian,
>>> Yes, the affinity of IRQ does work for me.
>>> But the affinity of IRQ does not happen runtime based on load.
>>
>> It can if you also run irqbalance.
> 
> 
> Hi Florian,
> 
> Is it some kernel feature ?  Sorry I am not aware of this ?
> I know it can be done in userspace.

The kernel interface is /proc/<irq>/smp_affinity and the users-space
implementation resides here:

https://github.com/Irqbalance/irqbalance
-- 
Florian

WARNING: multiple messages have this Message-ID
From: Florian Fainelli <f.fainelli@gmail.com>
To: Rakesh Pillai <pillair@codeaurora.org>, 'Andrew Lunn' <andrew@lunn.ch>
Cc: netdev@vger.kernel.org, linux-wireless@vger.kernel.org,
	linux-kernel@vger.kernel.org, ath10k@lists.infradead.org,
	dianders@chromium.org, evgreen@chromium.org, kuba@kernel.org,
	johannes@sipsolutions.net, davem@davemloft.net,
	kvalo@codeaurora.org
Subject: Re: [RFC 0/7] Add support to process rx packets in thread
Date: Fri, 24 Jul 2020 15:28:03 -0700	[thread overview]
Message-ID: <80490faa-f9e8-3bac-a645-7458b9d6aa62@gmail.com> (raw)
In-Reply-To: <000201d66182$8989a3b0$9c9ceb10$@codeaurora.org>

On 7/23/20 11:20 PM, Rakesh Pillai wrote:
> 
> 
>> -----Original Message-----
>> From: Florian Fainelli <f.fainelli@gmail.com>
>> Sent: Friday, July 24, 2020 12:33 AM
>> To: Rakesh Pillai <pillair@codeaurora.org>; 'Andrew Lunn'
>> <andrew@lunn.ch>
>> Cc: ath10k@lists.infradead.org; linux-wireless@vger.kernel.org; linux-
>> kernel@vger.kernel.org; kvalo@codeaurora.org; johannes@sipsolutions.net;
>> davem@davemloft.net; kuba@kernel.org; netdev@vger.kernel.org;
>> dianders@chromium.org; evgreen@chromium.org
>> Subject: Re: [RFC 0/7] Add support to process rx packets in thread
>>
>> On 7/23/20 11:21 AM, Rakesh Pillai wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Florian Fainelli <f.fainelli@gmail.com>
>>>> Sent: Tuesday, July 21, 2020 11:35 PM
>>>> To: Andrew Lunn <andrew@lunn.ch>; Rakesh Pillai
>> <pillair@codeaurora.org>
>>>> Cc: ath10k@lists.infradead.org; linux-wireless@vger.kernel.org; linux-
>>>> kernel@vger.kernel.org; kvalo@codeaurora.org;
>> johannes@sipsolutions.net;
>>>> davem@davemloft.net; kuba@kernel.org; netdev@vger.kernel.org;
>>>> dianders@chromium.org; evgreen@chromium.org
>>>> Subject: Re: [RFC 0/7] Add support to process rx packets in thread
>>>>
>>>> On 7/21/20 10:25 AM, Andrew Lunn wrote:
>>>>> On Tue, Jul 21, 2020 at 10:44:19PM +0530, Rakesh Pillai wrote:
>>>>>> NAPI gets scheduled on the CPU core which got the
>>>>>> interrupt. The linux scheduler cannot move it to a
>>>>>> different core, even if the CPU on which NAPI is running
>>>>>> is heavily loaded. This can lead to degraded wifi
>>>>>> performance when running traffic at peak data rates.
>>>>>>
>>>>>> A thread on the other hand can be moved to different
>>>>>> CPU cores, if the one on which its running is heavily
>>>>>> loaded. During high incoming data traffic, this gives
>>>>>> better performance, since the thread can be moved to a
>>>>>> less loaded or sometimes even a more powerful CPU core
>>>>>> to account for the required CPU performance in order
>>>>>> to process the incoming packets.
>>>>>>
>>>>>> This patch series adds the support to use a high priority
>>>>>> thread to process the incoming packets, as opposed to
>>>>>> everything being done in NAPI context.
>>>>>
>>>>> I don't see why this problem is limited to the ath10k driver. I expect
>>>>> it applies to all drivers using NAPI. So shouldn't you be solving this
>>>>> in the NAPI core? Allow a driver to request the NAPI core uses a
>>>>> thread?
>>>>
>>>> What's more, you should be able to configure interrupt affinity to steer
>>>> RX processing onto a desired CPU core, is not that working for you
>>>> somehow?
>>>
>>> Hi Florian,
>>> Yes, the affinity of IRQ does work for me.
>>> But the affinity of IRQ does not happen runtime based on load.
>>
>> It can if you also run irqbalance.
> 
> 
> Hi Florian,
> 
> Is it some kernel feature ?  Sorry I am not aware of this ?
> I know it can be done in userspace.

The kernel interface is /proc/<irq>/smp_affinity and the users-space
implementation resides here:

https://github.com/Irqbalance/irqbalance
-- 
Florian

_______________________________________________
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ath10k@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/ath10k

  reply	other threads:[~2020-07-24 22:28 UTC|newest]

Thread overview: 96+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-21 17:14 Rakesh Pillai
2020-07-21 17:14 ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 1/7] mac80211: Add check for napi handle before WARN_ON Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-22 12:56   ` Johannes Berg
2020-07-22 12:56     ` Johannes Berg
2020-07-23 18:26     ` Rakesh Pillai
2020-07-23 18:26       ` Rakesh Pillai
2020-07-23 20:06       ` Johannes Berg
2020-07-23 20:06         ` Johannes Berg
2020-07-24  6:21         ` Rakesh Pillai
2020-07-24  6:21           ` Rakesh Pillai
2020-07-26 16:19         ` Rakesh Pillai
2020-07-26 16:19           ` Rakesh Pillai
2020-07-30 12:40           ` Johannes Berg
2020-07-30 12:40             ` Johannes Berg
2020-07-21 17:14 ` [RFC 2/7] ath10k: Add support to process rx packet in thread Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 21:53   ` Rajkumar Manoharan
2020-07-21 21:53     ` Rajkumar Manoharan
2020-07-22 12:27     ` Felix Fietkau
2020-07-22 12:27       ` Felix Fietkau
2020-07-22 12:55       ` Johannes Berg
2020-07-22 12:55         ` Johannes Berg
2020-07-22 13:00         ` Felix Fietkau
2020-07-22 13:00           ` Felix Fietkau
2020-07-23  6:09           ` Rajkumar Manoharan
2020-07-23  6:09             ` Rajkumar Manoharan
2021-03-22 23:57           ` Ben Greear
2021-03-22 23:57             ` Ben Greear
2021-03-23  1:20             ` Brian Norris
2021-03-23  1:20               ` Brian Norris
2021-03-23  3:01               ` Ben Greear
2021-03-23  3:01                 ` Ben Greear
2021-03-23  7:45                 ` Felix Fietkau
2021-03-23  7:45                   ` Felix Fietkau
2021-03-25  9:45                   ` Rakesh Pillai
2021-03-25  9:45                     ` Rakesh Pillai
2021-03-25 10:33                     ` Felix Fietkau
2021-03-25 10:33                       ` Felix Fietkau
2020-07-23 18:25     ` Rakesh Pillai
2020-07-23 18:25       ` Rakesh Pillai
2020-07-24 23:11       ` Jacob Keller
2020-07-24 23:11         ` Jacob Keller
2020-07-21 17:14 ` [RFC 3/7] ath10k: Add module param to enable rx thread Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 4/7] ath10k: Do not exhaust budget on process tx completion Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 5/7] ath10k: Handle the rx packet processing in thread Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 6/7] ath10k: Add deliver to stack from thread context Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-21 17:14 ` [RFC 7/7] ath10k: Handle rx thread suspend and resume Rakesh Pillai
2020-07-21 17:14   ` Rakesh Pillai
2020-07-23 23:06   ` Sebastian Gottschall
2020-07-23 23:06     ` Sebastian Gottschall
2020-07-24  6:19     ` Rakesh Pillai
2020-07-24  6:19       ` Rakesh Pillai
2020-07-21 17:25 ` [RFC 0/7] Add support to process rx packets in thread Andrew Lunn
2020-07-21 17:25   ` Andrew Lunn
2020-07-21 18:05   ` Florian Fainelli
2020-07-21 18:05     ` Florian Fainelli
2020-07-23 18:21     ` Rakesh Pillai
2020-07-23 18:21       ` Rakesh Pillai
2020-07-23 19:02       ` Florian Fainelli
2020-07-23 19:02         ` Florian Fainelli
2020-07-24  6:20         ` Rakesh Pillai
2020-07-24  6:20           ` Rakesh Pillai
2020-07-24 22:28           ` Florian Fainelli [this message]
2020-07-24 22:28             ` Florian Fainelli
2020-07-22  9:12   ` David Laight
2020-07-22  9:12     ` David Laight
2020-07-25  8:16     ` Hillf Danton
2020-07-25 10:38       ` Sebastian Gottschall
2020-07-25 10:38         ` Sebastian Gottschall
2020-07-25 12:25         ` Hillf Danton
2020-07-25 14:08         ` Sebastian Gottschall
2020-07-25 14:08           ` Sebastian Gottschall
2020-07-25 14:57           ` Hillf Danton
2020-07-25 15:41             ` Sebastian Gottschall
2020-07-25 15:41               ` Sebastian Gottschall
2020-07-26 11:16               ` David Laight
2020-07-26 11:16                 ` David Laight
2020-07-28 16:59                 ` Rakesh Pillai
2020-07-28 16:59                   ` Rakesh Pillai
2020-07-29  1:34                   ` Hillf Danton
2020-07-25 17:57       ` Felix Fietkau
2020-07-25 17:57         ` Felix Fietkau
2020-07-26  1:22         ` Hillf Danton
2020-07-26  8:10           ` Felix Fietkau
2020-07-26  8:10             ` Felix Fietkau
2020-07-26  8:32             ` Hillf Danton
2020-07-26  8:59               ` Felix Fietkau
2020-07-26  8:59                 ` Felix Fietkau
2020-07-22 16:20   ` Jakub Kicinski
2020-07-22 16:20     ` Jakub Kicinski

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