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
next prev parent 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=478937EA.1010208@zytor.com \
--to=hpa@zytor.com \
--cc=akpm@osdl.org \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=bcrl@kvack.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-serial@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.