linux-kernel - Re: serial flow control appears broken

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Date:	Thu, 2 Aug 2007 18:13:49 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Mark Lord <lkml@....ca>
Cc:	Robert Hancock <hancockr@...w.ca>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Lee Howard <faxguy@...ardsilvan.com>,
	linux-serial@...r.kernel.org, tytso@....edu,
	linux-kernel@...r.kernel.org
Subject: Re: serial flow control appears broken

> That's what "hdparm -u1" (or -u0) controls.

Only some of the time.

> Ingo's RT patches would probably fix all of this.

The worst case IDE times we've seen for executing a single indivisible
un-interruptible I/O cycle with a drive are around 1mS. Thats a hardware
limit.

Alan
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