linux-kernel - [PATCH v1 0/2] usb: gadget: dummy_hcd: Switch to hrtimers for better performance

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Message-ID: <cover.1712843963.git.sylv@sylv.io>
Date: Thu, 11 Apr 2024 17:22:09 +0200
From: Marcello Sylvester Bauer <sylv@...v.io>
To: linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Marcello Sylvester Bauer <marcello.bauer@...ements.com>,
	Matthias Stoeckl <matthias.stoeckl@...unet.com>,
	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>,
	Marcello Sylvester Bauer <sylv@...v.io>
Subject: [PATCH v1 0/2] usb: gadget: dummy_hcd: Switch to hrtimers for better performance

About 10 years ago, there was a discussion about the poor performance
of dummy_hcd due to the use of jiffies instead of hrtimers [1].
There was a proposal to switch to hrtimers, but the patch never made it
into the mainline, and I cannot figure out why.

This patch set brings the idea back to the mailing list with the
intention of improving the overall performance of this driver.

[1](https://linux-usb.vger.kernel.narkive.com/Fdt5oBR8/dummy-hcd-performance-correctness)

Marcello Sylvester Bauer (2):
  usb: gadget: dummy_hcd: Switch to hrtimer transfer scheduler
  usb: gadget: dummy_hcd: Set transfer interval to 1 microframe

 drivers/usb/gadget/udc/dummy_hcd.c | 37 ++++++++++++++++++------------
 1 file changed, 22 insertions(+), 15 deletions(-)

-- 
2.44.0