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Message-ID: <54AA9A35.2000806@hurleysoftware.com> Date: Mon, 05 Jan 2015 09:05:41 -0500 From: Peter Hurley <peter@...leysoftware.com> To: Vineet Gupta <Vineet.Gupta1@...opsys.com>, "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org> CC: "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "robh@...nel.org" <robh@...nel.org>, "jslaby@...e.cz" <jslaby@...e.cz>, Arnd Bergmann <arnd@...db.de> Subject: Re: [PATCH v2 2/3] serial: 8250_early: prepare for dynamic BASE_BAUD On 01/05/2015 08:52 AM, Vineet Gupta wrote: > On Monday 05 January 2015 07:04 PM, Peter Hurley wrote: >>> Also what do u think of the early IER optimization ? >> Seems ok except the commit changelog is wrong: IER is disabled twice per _line_. >> How did you profile it? It's ok if the answer is "seemed faster"; I'm just >> curious. > > Looking at the code yes this would be per line - but I vaguely remember seeing it > for every char - this was when debugging a systemC model for 8250. Its been a while... > I'd added prints in the model whenever IER would wiggle and it was just being > written with 0's again and again when in the early polling based printing mode. Maybe that was while running kgdb through serial8250_put_poll_char(), which is per-char. Regards, Peter Hurley -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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