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>
Subject: Re: [PATCH] NCR53c406a.c warning
Date: Fri, 12 Sep 2003 15:47:35 +0100 [thread overview]
Message-ID: <1063378054.5785.1.camel@dhcp23.swansea.linux.org.uk> (raw)
In-Reply-To: <Pine.GSO.3.96.1030912161154.17936I-100000@delta.ds2.pg.gda.pl>
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.
prev parent reply other threads:[~2003-09-12 14:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-11 6:37 [PATCH] NCR53c406a.c warning Geert Uytterhoeven
2003-09-12 13:41 ` James Bottomley
2003-09-12 14:16 ` Maciej W. Rozycki
2003-09-12 14:47 ` Alan Cox [this message]
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