Jeff,
Sorry about the HTML email, I think it is disabled now.
I am guessing that this is the one whenever wvdial starts or tries to
set the ioctl since it appears immediately after I run wvdial:
line_ioctl: ttyS4: unknown ioctl:0x541e
I also got this other unknown ioctl when wvdial shuts down::
line_ioctl: ttyS4: unknown ioctl:0x80047437
The ioctl calls that returned -1 from the strace are:
ioctl (4, TIOCGSERIAL)
ioctl (3, TIOCMGET,[0])
ioctl (4, SNDCTL_TMR_START or TCSETS, {B230400 -opost -isig -icanon
-echo ...})
The first two happen when wvdial starts up the connection and the third
happens when wvdial is shutting down the connection.
There is also another issue that occurs occasionally: When wvdial
starts, one of the things it does is to send "ATZ" to the modem to reset
it and waits for a result code of "OK". On the screen, I can see this.
Sometimes when wvdial starts, it gets a blank line with the first "ATZ"
and sees this blank line as an incorrect result and re-issues the "ATZ".
However, the result code of "OK" in this "sometimes" case is received
before wvdial is ready for it so wvdial now times out. I have worked
around this by issuing an "echo ATZ >/dev/ttyS4" before I run wvdial.
The problem seems (to me) to be that the buffer in the host is not
getting flushed to the client (or guest to host) correctly or something
similar. I also suspect this is the same reason ssh and sftp are slow
to get the login prompt. Not a big problem though.
When I use the "screen /dev/sttyS4" program in the guest, everything
seems fine.
Let me know if there is anything else.
Mark
-------- Original Message --------
Subject: Re: [uml-user] slow ftp
From: Jeff Dike <[EMAIL PROTECTED]>
Date: Wed, August 22, 2007 11:48 pm
To: Mark <[EMAIL PROTECTED]>
Cc: user-mode-linux-user@lists.sourceforge.net
BTW, can you stop sending html-only mail - it's a pain to read.
On Wed, Aug 22, 2007 at 02:55:15PM -0700, Mark wrote:
> The line was "stty -F /dev/ttyS0 230400" on the host to set the baud
> rate. (I did check the baud rate on /dev/ttyS0 on the host before I
> set it to 230400. The serial port baud rate was indeed set to
> 9600.)
Are there any security issues with allowing a UML to fiddle a serial
port with stty? I can't think of any.
There's no reason I can't pass through the ioctls, but I'd like to
know which ones they are. Can you see if there's anything in the UML
dmesg about unknown ioctls, and send me a strace of the stty running
on either the host or UML?
Jeff
--
Work email - jdike at linux dot intel dot com
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