linux-kernel - RE: [PATCH net-next v2 2/2] r8152: set bp in bulk

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Message-ID: <41b998e0222c49d8bbc9eadf1611eb74@realtek.com>
Date:   Wed, 26 Jul 2023 09:50:18 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "kuba@...nel.org" <kuba@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        nic_swsd <nic_swsd@...ltek.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next v2 2/2] r8152: set bp in bulk

Andrew Lunn <andrew@...n.ch>
> Sent: Wednesday, July 26, 2023 4:39 PM
[...]
> >       /* wait 3 ms to make sure the firmware is stopped */
> >       usleep_range(3000, 6000);
> 
> How much time do you save compared to this 3ms - 6ms sleep?

I think it depends on the CPU and the USB host controller.
Take the PC produced this year for example, I think it saves less than 3ms normally.
However, I think saving the number of control transfer is better for both software and hardware.

Best Regards,
Hayes