* amd74xx (nforce) driver problem ?
@ 2005-08-01 9:06 Sonny Rao
2005-08-05 12:27 ` Vojtech Pavlik
0 siblings, 1 reply; 3+ messages in thread
From: Sonny Rao @ 2005-08-01 9:06 UTC (permalink / raw)
To: vojtech; +Cc: linux-kernel, akpm
Hi,
I have a system based on the Nforce2 chipset which uses the amd7xx
driver for it's IDE support, and I noticed that one of the drives was
performing very slowly. I looked into it a bit more and it seems the
drive was operating as UDMA33 instead of UDMA100 for some reason.
The affected drive was getting about 20-25Mb/sec sequential read (dumb
hdparm test) while a similar drive on the other channel was getting
about 45-50 Mb/sec. The drive on the other channel was operating at
UDMA100. Both drives are attached using the proper 80-wire cable.
Kernel is 2.6.13-rc4
If I go into the bios and twiddle an "IDE Master" setting from the
"none" to the "auto" setting then the driver operates at the expected
speed.
I'm confused though why the driver never correctly set up that IDE
channel? It claims in the kernel log that it detected the BIOS
borkage:
NFORCE2: IDE controller at PCI slot 0000:00:09.0
NFORCE2: chipset revision 162
NFORCE2: not 100% native mode: will probe irqs later
NFORCE2: BIOS didn't set cable bits correctly. Enabling workaround.
NFORCE2: 0000:00:09.0 (rev a2) UDMA133 controller
ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA
Shouldn't the driver set the channel to UDMA100 after it detects the BIOS
set up the chip improperly, or am I mistaken about this behavior? Isn't
that the "workaround" or does that mean something else?
Here is the output of /proc/ide/amd74xx:
----------AMD BusMastering IDE Configuration----------------
Driver Version: 2.13
South Bridge: 0000:00:09.0
Revision: IDE 0xa2
Highest DMA rate: UDMA133
BM-DMA base: 0xf000
PCI clock: 33.3MHz
-----------------------Primary IDE-------Secondary IDE------
Prefetch Buffer: yes yes
Post Write Buffer: yes yes
Enabled: yes yes
Simplex only: no no
Cable Type: 40w 80w
-------------------drive0----drive1----drive2----drive3-----
Transfer Mode: UDMA DMA UDMA DMA
Address Setup: 30ns 90ns 30ns 90ns
Cmd Active: 90ns 90ns 90ns 90ns
Cmd Recovery: 30ns 30ns 30ns 30ns
Data Active: 90ns 330ns 90ns 330ns
Data Recovery: 30ns 270ns 30ns 270ns
Cycle Time: 60ns 600ns 20ns 600ns
Transfer Rate: 33.3MB/s 3.3MB/s 99.9MB/s 3.3MB/s
If I change all of my BIOS settings to "auto" then the drive operates
at UDMA100 as expected and /proc/ide/amd74xx reports the 80-wire cable
correctly and reports the transfer rates for drive0 correctly.
This isn't a major issue since I can fix it in the BIOS, but I just
wanted to alert the maintainers.
Thanks in advance,
Sonny
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: amd74xx (nforce) driver problem ?
2005-08-01 9:06 amd74xx (nforce) driver problem ? Sonny Rao
@ 2005-08-05 12:27 ` Vojtech Pavlik
0 siblings, 0 replies; 3+ messages in thread
From: Vojtech Pavlik @ 2005-08-05 12:27 UTC (permalink / raw)
To: Sonny Rao; +Cc: linux-kernel, akpm
On Mon, Aug 01, 2005 at 05:06:33AM -0400, Sonny Rao wrote:
> Hi,
>
> I have a system based on the Nforce2 chipset which uses the amd7xx
> driver for it's IDE support, and I noticed that one of the drives was
> performing very slowly. I looked into it a bit more and it seems the
> drive was operating as UDMA33 instead of UDMA100 for some reason.
>
> The affected drive was getting about 20-25Mb/sec sequential read (dumb
> hdparm test) while a similar drive on the other channel was getting
> about 45-50 Mb/sec. The drive on the other channel was operating at
> UDMA100. Both drives are attached using the proper 80-wire cable.
>
> Kernel is 2.6.13-rc4
>
> If I go into the bios and twiddle an "IDE Master" setting from the
> "none" to the "auto" setting then the driver operates at the expected
> speed.
>
>
> I'm confused though why the driver never correctly set up that IDE
> channel? It claims in the kernel log that it detected the BIOS
> borkage:
>
> NFORCE2: IDE controller at PCI slot 0000:00:09.0
> NFORCE2: chipset revision 162
> NFORCE2: not 100% native mode: will probe irqs later
> NFORCE2: BIOS didn't set cable bits correctly. Enabling workaround.
> NFORCE2: 0000:00:09.0 (rev a2) UDMA133 controller
> ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
> ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA
>
>
> Shouldn't the driver set the channel to UDMA100 after it detects the BIOS
> set up the chip improperly, or am I mistaken about this behavior? Isn't
> that the "workaround" or does that mean something else?
The driver simply takes the information from another register, also
supplied by the BIOS. If you set the drive to 'none', it doesn't have
anywhere to look, since the primary location is borked because of bad BIOS.
--
Vojtech Pavlik
SuSE Labs, SuSE CR
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: amd74xx (nforce) driver problem ?
[not found] <4wEt8-4Qk-1@gated-at.bofh.it>
@ 2005-08-01 18:10 ` Robert Hancock
0 siblings, 0 replies; 3+ messages in thread
From: Robert Hancock @ 2005-08-01 18:10 UTC (permalink / raw)
To: linux-kernel
Sonny Rao wrote:
> NFORCE2: IDE controller at PCI slot 0000:00:09.0
> NFORCE2: chipset revision 162
> NFORCE2: not 100% native mode: will probe irqs later
> NFORCE2: BIOS didn't set cable bits correctly. Enabling workaround.
> NFORCE2: 0000:00:09.0 (rev a2) UDMA133 controller
> ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
> ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA
>
>
> Shouldn't the driver set the channel to UDMA100 after it detects the BIOS
> set up the chip improperly, or am I mistaken about this behavior? Isn't
> that the "workaround" or does that mean something else?
I think the workaround is something else. I get that message as well on
nForce4 (Asus A8N-SLI Deluxe). The drives are definitely set to auto in
the BIOS (only optical drives are on the PATA controller).
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2005-08-05 12:27 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2005-08-01 9:06 amd74xx (nforce) driver problem ? Sonny Rao
2005-08-05 12:27 ` Vojtech Pavlik
[not found] <4wEt8-4Qk-1@gated-at.bofh.it>
2005-08-01 18:10 ` Robert Hancock
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).