All of lore.kernel.org
 help / color / mirror / Atom feed
From: Florian Fainelli <f.fainelli@gmail.com>
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
Date: Tue, 21 Jul 2020 11:05:03 -0700	[thread overview]
Message-ID: <f6d93d76-9e59-c257-9318-31c71df28018@gmail.com> (raw)
In-Reply-To: <20200721172514.GT1339445@lunn.ch>

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?
-- 
Florian

WARNING: multiple messages have this Message-ID
From: Florian Fainelli <f.fainelli@gmail.com>
To: Andrew Lunn <andrew@lunn.ch>, Rakesh Pillai <pillair@codeaurora.org>
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: Tue, 21 Jul 2020 11:05:03 -0700	[thread overview]
Message-ID: <f6d93d76-9e59-c257-9318-31c71df28018@gmail.com> (raw)
In-Reply-To: <20200721172514.GT1339445@lunn.ch>

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?
-- 
Florian

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

  reply	other threads:[~2020-07-21 18:05 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 [this message]
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
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

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=f6d93d76-9e59-c257-9318-31c71df28018@gmail.com \
    --to=f.fainelli@gmail.com \
    --cc=andrew@lunn.ch \
    --cc=ath10k@lists.infradead.org \
    --cc=davem@davemloft.net \
    --cc=dianders@chromium.org \
    --cc=evgreen@chromium.org \
    --cc=johannes@sipsolutions.net \
    --cc=kuba@kernel.org \
    --cc=kvalo@codeaurora.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=netdev@vger.kernel.org \
    --cc=pillair@codeaurora.org \
    --subject='Re: [RFC 0/7] Add support to process rx packets in thread' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.