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Subject: Re: [PATCH] NCR53c406a.c warning
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: James Bottomley <James.Bottomley@SteelEye.com>,
       Geert Uytterhoeven <geert@linux-m68k.org>,
       SCSI Mailing List <linux-scsi@vger.kernel.org>,
       Linux Kernel Development <linux-kernel@vger.kernel.org>
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Date: Fri, 12 Sep 2003 15:47:35 +0100
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On Gwe, 2003-09-12 at 15:16, Maciej W. Rozycki wrote:
>  I've encountered an ISA adapter using this chip in polled mode (no ISA
> IRQ line routed to the chip) quite recently.  But I can't say if the guy
> using it won't throw it away before final 2.6. ;-)

For a lot of these dumb controllers polled I/O seems to materially 
outperform interrupt driven I/O on SMP boxes - its true of the NCR5380
for example. We trade a ton of locking jamming the box up for a CPU
thats spending some of its time pretending to be half a scsi chip.