linux-kernel - Re: [PATCH] serial: remove "too much work for irq" printk

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Date:	Sat, 12 Jan 2008 13:58:02 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	Benjamin LaHaise <bcrl@...ck.org>, akpm@...l.org,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: remove "too much work for irq" printk

Alan Cox wrote:
>> This is going to put trouble in other places unless, at least, it can be 
>> turned off.  The UART serial interface is heavily emulated as a console 
>> interface without an actual serial port behind it, both in hardware and 
>> software.  Rates will typically vastly exceed real serial port rates, 
> 
> Yes Dell do it, HP do it, IBM do it. Have done for years, never caused us
> a problem. Its only KVM tripping it.
> 
> As to bit rate we support up to about 1 to 1.5 Mbit.
> 

FWIW, the highest rate I've seen in hardware is a FIFO about 4K deep 
that can be polled at about 25 MHz when all the overhead is accounted for.

	-hpa
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