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From: "H. Peter Anvin" <hpa@zytor.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Benjamin LaHaise <bcrl@kvack.org>,
	akpm@osdl.org, linux-serial@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] serial: remove "too much work for irq" printk
Date: Sat, 12 Jan 2008 13:58:02 -0800	[thread overview]
Message-ID: <478937EA.1010208@zytor.com> (raw)
In-Reply-To: <20080112214230.241018d4@lxorguk.ukuu.org.uk>

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

  reply	other threads:[~2008-01-12 21:58 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-01-12 20:15 [PATCH] serial: remove "too much work for irq" printk Benjamin LaHaise
2008-01-12 20:21 ` Christoph Hellwig
2008-01-12 21:24 ` Alan Cox
2008-01-12 21:39   ` H. Peter Anvin
2008-01-12 21:42     ` Alan Cox
2008-01-12 21:58       ` H. Peter Anvin [this message]
2008-01-13 22:03   ` Pavel Machek

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