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From: Lee Howard <faxguy@howardsilvan.com>
To: Ray Lee <ray-lk@madrabbit.org>
Cc: Paul Fulghum <paulkf@microgate.com>,
	Tilman Schmidt <tilman@imap.cc>,
	Alan Cox <alan@lxorguk.ukuu.org.uk>,
	Robert Hancock <hancockr@shaw.ca>,
	linux-serial@vger.kernel.org, tytso@mit.edu,
	rmk@arm.linux.org.uk, linux-kernel@vger.kernel.org
Subject: Re: serial flow control appears broken
Date: Sat, 04 Aug 2007 11:21:07 -0700	[thread overview]
Message-ID: <46B4C393.4020506@howardsilvan.com> (raw)
In-Reply-To: <2c0942db0707280941n1b9e1f7i9c0de332286e8aac@mail.gmail.com>

Ray Lee wrote:

>On 7/27/07, Lee Howard <faxguy@howardsilvan.com> wrote:
>  
>
>>Curiously, the session at 38400 bps that skipped 858 bytes... coincided,
>>not just in sequence but also in precice timing within the session, with
>>a small but noticeable disk load that I caused by grepping through a
>>hundred session logs.  (I can't reproduce it easily, though, because of
>>disk caching.)
>>    
>>
>
>`echo 1 > /proc/sys/vm/drop_caches` will clear out most (all?) of what
>the kernel has cached from the drive. It's there just for this kind of
>repeatability of tests...
>

And in repeat tests it is quite evident that IDE disk activity is, 
indeed, at least part of the problem.  As IDE disk activity increases an 
increased amount of data coming in on the serial port goes missing.

Thanks,

Lee.

  reply	other threads:[~2007-08-04 18:21 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.Z6O0xFRT69zes0Mg+agt3Uiwux4@ifi.uio.no>
2007-07-26  7:20 ` serial flow control appears broken Robert Hancock
2007-07-26 16:08   ` Lee Howard
2007-07-26 16:31     ` Alan Cox
2007-07-27  5:53       ` Lee Howard
2007-07-27 11:47         ` Alan Cox
2007-07-27 17:36           ` Lee Howard
2007-07-27 13:45         ` Tilman Schmidt
2007-07-27 19:34           ` Paul Fulghum
2007-08-27 20:38             ` Paul Fulghum
2007-07-27 20:48             ` Lee Howard
2007-07-27 23:28               ` Paul Fulghum
2007-07-28  4:51                 ` Lee Howard
2007-07-28  9:18                   ` Russell King
2007-07-28 12:00                   ` Alan Cox
2007-07-28 15:39                     ` Lee Howard
2007-08-01 21:54                       ` Frantisek Rysanek
2007-07-28 16:41                   ` Ray Lee
2007-08-04 18:21                     ` Lee Howard [this message]
2007-08-04 22:07                       ` Paul Fulghum
2007-08-05  0:00                         ` Lee Howard
2007-08-05 14:52                           ` Paul Fulghum
2007-07-27 19:34           ` Paul Fulghum
2007-07-27 20:05           ` Lee Howard
2007-07-27 11:32     ` Maciej W. Rozycki
2007-07-27 17:11       ` Lee Howard
2007-07-27 17:41         ` Alan Cox
2007-07-27 17:53         ` Maciej W. Rozycki
2007-07-27 18:11           ` Lee Howard
2007-07-30  9:36             ` Maciej W. Rozycki
2007-07-27 18:22           ` Robert Hancock
2007-07-27 18:46             ` Paul Fulghum
2007-07-27 19:05             ` Paul Fulghum
2007-07-30  9:39               ` Maciej W. Rozycki
2007-07-27 19:14             ` Paul Fulghum
2007-07-28  9:28             ` Russell King
2007-07-30  9:45               ` Maciej W. Rozycki
2007-07-30  9:59                 ` Russell King
2007-08-02 14:57                 ` Mark Lord
2007-08-02 16:14                   ` Robert Hancock
2007-08-02 16:29                     ` Mark Lord
2007-08-02 16:40                       ` Robert Hancock
2007-08-02 17:13                       ` Alan Cox
2007-08-04 19:38                       ` Lee Howard
2007-08-02 16:57                     ` Alan Cox
2007-08-02 17:02                       ` Robert Hancock
2007-08-03  9:32                       ` Maciej W. Rozycki
2007-07-30  9:34             ` Maciej W. Rozycki
2007-08-04 18:19           ` Lee Howard
2007-07-26  1:52 Lee Howard
2007-07-26 12:34 ` Uwe Kleine-König
2007-07-26 12:34   ` Uwe Kleine-König
2007-07-26 16:28   ` Lee Howard
2007-07-26 16:28     ` Lee Howard
2007-07-26 16:41     ` Alan Cox
2007-07-27  6:17       ` Lee Howard
2007-07-27 11:56         ` Alan Cox
2007-07-27 18:00           ` Lee Howard
2007-07-26 15:51 ` Tosoni
2007-07-26 16:31   ` Lee Howard

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