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SubjectRe: [2.6.0-test11] VIA IDE DMA problems with sleeping harddisk
On Tue, Dec 16, 2003 at 03:38:08PM +0100, Claas Langbehn wrote:
> Hello,
>
>
> I have got two harddiscs in my system (hda, hdb) and an CD-R/W writer as
> hdc. Both harddiscs are UDMA-100 drives. First of all, it is strange
> that the drives are only set to a transfer rate of 88.8 MB/s and not
> to 100MB/s (see below).

This is normal. UDMA/133 chipsets often don't support 100MB/sec, because
it's not possible with a 266 MHz clock, so instead you get 88.8MB/sec,
which is the closest lower value achievable.

> hdb is sleeping most of the time (hdparm -S), but when I need the drive,
> it does not spin up fast enough, so that the kernel messages say:
>
> Dec 16 15:13:14 kernel: hdb: dma_timer_expiry: dma status == 0x61
> Dec 16 15:13:24 kernel: hdb: DMA timeout error
> Dec 16 15:13:24 kernel: hdb: dma timeout error: status=0xd0 { Busy }
> Dec 16 15:13:24 kernel:
> Dec 16 15:13:24 kernel: hda: DMA disabled
> Dec 16 15:13:24 kernel: hdb: DMA disabled
> Dec 16 15:13:25 kernel: ide0: reset: success
>
> In /proc/ide/via i see, that hda is using PIO now:
>
> -------------------drive0----drive1----drive2----drive3-----
> Transfer Mode: PIO UDMA UDMA PIO
> Address Setup: 120ns 120ns 120ns 120ns
> Cmd Active: 90ns 90ns 90ns 90ns
> Cmd Recovery: 30ns 30ns 30ns 30ns
> Data Active: 90ns 90ns 90ns 330ns
> Data Recovery: 30ns 30ns 30ns 270ns
> Cycle Time: 120ns 22ns 60ns 600ns
> Transfer Rate: 16.6MB/s 88.8MB/s 33.3MB/s 3.3MB/s
>
> When I re-enable DMA afterwards the messages say:
>
> Dec 16 15:13:49 zoo kernel: blk: queue dfde1200, I/O limit 4095Mb (mask
> 0xffffffff)
>
>
>
> - How do I increase the dma_timer_expiry so that DMA will
> not be disabled so fast?
>
> - Why does the kernel say "hdb: DMA disabled" but /proc/ide/via says
> that DMA was only disabled on hda?
> Is it a bug or is it enabled again without telling me?

DMA is enabled in the chipset but not used by the driver.

>
> - Which workaround should be considered?
>
>
>
> Regards, Claas
>
>
>
> # cat /proc/ide/via (with DMA enabled)
>
> ----------VIA BusMastering IDE Configuration----------------
> Driver Version: 3.38
> South Bridge: VIA vt8235
> Revision: ISA 0x0 IDE 0x6
> Highest DMA rate: UDMA133
> BM-DMA base: 0xdc00
> PCI clock: 33.3MHz
> Master Read Cycle IRDY: 0ws
> Master Write Cycle IRDY: 0ws
> BM IDE Status Register Read Retry: yes
> Max DRDY Pulse Width: No limit
> -----------------------Primary IDE-------Secondary IDE------
> Read DMA FIFO flush: yes yes
> End Sector FIFO flush: no no
> Prefetch Buffer: yes yes
> Post Write Buffer: yes yes
> Enabled: yes yes
> Simplex only: no no
> Cable Type: 80w 80w
> -------------------drive0----drive1----drive2----drive3-----
> Transfer Mode: UDMA UDMA UDMA PIO
> Address Setup: 120ns 120ns 120ns 120ns
> Cmd Active: 90ns 90ns 90ns 90ns
> Cmd Recovery: 30ns 30ns 30ns 30ns
> Data Active: 90ns 90ns 90ns 330ns
> Data Recovery: 30ns 30ns 30ns 270ns
> Cycle Time: 22ns 22ns 60ns 600ns
> Transfer Rate: 88.8MB/s 88.8MB/s 33.3MB/s 3.3MB/s
>
> # uname -a
> Linux zoo 2.6.0-test11 #3 Mon Dec 1 19:57:51 CET 2003 i686 GNU/Linux
>
> -
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--
Vojtech Pavlik
SuSE Labs, SuSE CR
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