linux-kernel - Re: serial flow control appears broken

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Message-ID: <2c0942db0707280941n1b9e1f7i9c0de332286e8aac@mail.gmail.com>
Date:	Sat, 28 Jul 2007 09:41:20 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Lee Howard" <faxguy@...ardsilvan.com>
Cc:	"Paul Fulghum" <paulkf@...rogate.com>,
	"Tilman Schmidt" <tilman@...p.cc>,
	"Alan Cox" <alan@...rguk.ukuu.org.uk>,
	"Robert Hancock" <hancockr@...w.ca>, linux-serial@...r.kernel.org,
	tytso@....edu, rmk@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: serial flow control appears broken

On 7/27/07, Lee Howard <faxguy@...ardsilvan.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...

Ray
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