linux-kernel - libata/PATA: GPCMD_SET_STREAMING via SG

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Date:	Tue, 13 Nov 2007 17:43:23 +0100
From:	Sebastian Kemper <sebastian_ml@....net>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: libata/PATA: GPCMD_SET_STREAMING via SG_IO does nothing

Hi all,

while trying to limit the speed of DVD drives during DVD playback I've
come under the impression that GPCMD_SET_STREAMING via SG_IO doesn't yet
work with libata/PATA (AMD/NVIDIA PATA support). I tested on an NForce2
board (all IDE, no SATA) and kernel 2.6.22.12. When I use the "old" ATA
kernel driver my drive slows down, with libata it doesn't. Is this a
known issue or has this slipped by unnoticed?

I tried with mplayer dvd:// -dvd-device /dev/sr0 -dvd-speed BTW . I get
no errors in syslog/dmesg. Also mplayer doesn't report a problem (so
ioctl(fd, SG_IO, &sghdr) doesn't have a return < 0).

Regards
Sebastian

View attachment "libata-dmesg.out" of type "text/plain" (15466 bytes)

View attachment "ver_linux.out" of type "text/plain" (920 bytes)

View attachment "kernel-libata.config" of type "text/plain" (5735 bytes)