archive mirror
 help / color / mirror / Atom feed
From: Chris Chiu <>
To: Kalle Valo <>
	Linux Kernel <>
Subject: Re: [PATCH] rtl8xxxu: disable interrupt_in transfer for 8188cu and 8192cu
Date: Mon, 5 Jul 2021 17:00:10 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, Jul 2, 2021 at 4:42 PM Kalle Valo <> wrote:
> writes:
> > From: Chris Chiu <>
> >
> > There will be crazy numbers of interrupts triggered by 8188cu and
> > 8192cu module, around 8000~10000 interrupts per second, on the usb
> > host controller. Compare with the vendor driver source code, it's
> > mapping to the configuration CONFIG_USB_INTERRUPT_IN_PIPE and it is
> > disabled by default.
> >
> > Since the interrupt transfer is neither used for TX/RX nor H2C
> > commands. Disable it to avoid the confusing interrupts for the
> > 8188cu and 8192cu module which I only have for verification.
> The last paragraph is not entirely clear for me, can you elaborate it
> more? What do you mean with "confusing interrupts"? And is this fixing
> an actual user visible bug or are you just reducing the number of
> interrupts?
It's confusing because there are 8000~9000 interrupts per second even
though the association is not done yet and no traffic is pumped. It's
also way too many even the reception of the beacon frames triggers the
interrupt. This huge number overwhelms the normal interrupt we
expected from the register setting (only < 100/sec if runs with
rtlwif/rtl8192cu driver instead). It's difficult to judge where/why
the interrupts come from and what possible overhead it could possibly

> --

  reply	other threads:[~2021-07-05  9:00 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-01 16:33 [PATCH] rtl8xxxu: disable interrupt_in transfer for 8188cu and 8192cu chris.chiu
2021-07-02  8:41 ` Kalle Valo
2021-07-05  9:00   ` Chris Chiu [this message]
2021-07-05  0:35 ` Reto Schneider
2021-07-06 17:35 ` Jes Sorensen
2021-08-21 18:17 ` Kalle Valo

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:

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

  git send-email \ \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).