linux-kernel - Re: Kernel 2.6.30rc7 limits IDE to UDMA33

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Message-ID: <c5bd819b0906040750w75e0389cod2a03b89ce838d1b@mail.gmail.com>
Date:	Thu, 4 Jun 2009 16:50:52 +0200
From:	Grozdan <neutrino8@...il.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	hancockrwd@...il.com, linux-kernel@...r.kernel.org,
	linux-ide@...r.kernel.org
Subject: Re: Kernel 2.6.30rc7 limits IDE to UDMA33

2009/6/3 Grozdan <neutrino8@...il.com>:
> 2009/6/3 Alan Cox <alan@...rguk.ukuu.org.uk>:
>> What about 2.6.28 or 2.6.29 ?
>>
>
> Hi,
>
> I just installed kernel 2.6.29.4-rt16-2-rt from the SUSE build service
> (there's no 2.6.28 one available nor a 'normal' 2.6.29 one) and my
> UDMA is set correctly just as when using the default 2.6.27.21 kernel.
> Now I'm not sure if there really is a problem in 2.6.30-rc7-git4 or
> did I somehow introduced it by configuring something incorrectly
> (which I doubt because as I said, I didn't touch anything related to
> IDE during configuration. I only tweaked a few options, most of them
> in the General and Processor sections).
>
> ---------- dmesg IDE of 2.6.29.4-rt16-2-rt----------------
>
> pata_via 0000:00:0f.0: PCI INT A -> Link[ALKA] -> GSI 20 (level, low) -> IRQ 20
> scsi0 : pata_via
> scsi1 : pata_via
> ata1: PATA max UDMA/133 cmd 0x1f0 ctl 0x3f6 bmdma 0xdc00 irq 14
> ata2: PATA max UDMA/133 cmd 0x170 ctl 0x376 bmdma 0xdc08 irq 15
> ata1.00: ATA-7: Maxtor 6Y080L0, YAR41BW0, max UDMA/133
> ata1.00: 160086528 sectors, multi 16: LBA
> ata1.01: ATA-5: ST340016A, 3.10, max UDMA/100
> ata1.01: 78165360 sectors, multi 16: LBA
> ata1.00: configured for UDMA/133
> ata1.01: configured for UDMA/100
> isa bounce pool size: 16 pages
> scsi 0:0:0:0: Direct-Access     ATA      Maxtor 6Y080L0   YAR4 PQ: 0 ANSI: 5
> scsi 0:0:1:0: Direct-Access     ATA      ST340016A        3.10 PQ: 0 ANSI: 5
> ata2.00: ATAPI: TSSTcorpCD/DVDW TS-H552U, US08, max UDMA/33
> ata2.00: configured for UDMA/33
> scsi 1:0:0:0: CD-ROM            TSSTcorp CD/DVDW TS-H552U US08 PQ: 0 ANSI: 5
> BIOS EDD facility v0.16 2004-Jun-25, 2 devices found
> udevd version 128 started
> Driver 'sd' needs updating - please use bus_type methods
> sd 0:0:0:0: [sda] 160086528 512-byte hardware sectors: (81.9 GB/76.3 GiB)
> sd 0:0:0:0: [sda] Write Protect is off
> sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
> sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't
> support DPO or FUA
> sd 0:0:0:0: [sda] 160086528 512-byte hardware sectors: (81.9 GB/76.3 GiB)
>

Adding more information. A user on the openSUSE forum which is trying
out openSUSE 11.2 milestone 2 (with kernel 2.6.30-rc6-git3) is having
the same problems. His computer is using the pata_amd driver instead
of pata_via like mine and he too gets limiting to UDMA33 during boot

Link: http://forums.opensuse.org/pre-release-beta/415373-hd-speed.html
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