linux-kernel - Re: [PATCH v1 1/2] usb: gadget: dummy_hcd: Switch to hrtimer transfer scheduler

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Message-ID: <fde7fd49-e0c3-4371-b3c1-e0ba4f438229@rowland.harvard.edu>
Date: Thu, 11 Apr 2024 12:30:08 -0400
From: Alan Stern <stern@...land.harvard.edu>
To: Marcello Sylvester Bauer <sylv@...v.io>
Cc: linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
  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>
Subject: Re: [PATCH v1 1/2] usb: gadget: dummy_hcd: Switch to hrtimer
 transfer scheduler

On Thu, Apr 11, 2024 at 05:22:10PM +0200, Marcello Sylvester Bauer wrote:
> The dummy_hcd transfer scheduler assumes that the internal kernel timer
> frequency is set to 1000Hz to give a polling interval of 1ms. Reducing
> the timer frequency will result in an anti-proportional reduction in
> transfer performance. Switch to a hrtimer to decouple this association.
> 
> Signed-off-by: Marcello Sylvester Bauer <marcello.bauer@...ements.com>
> Signed-off-by: Marcello Sylvester Bauer <sylv@...v.io>
> ---

Reviewed-by: Alan Stern <stern@...land.harvard.edu>