Messages in this thread | | | Date | Wed, 17 Dec 2003 19:46:06 +0100 | From | Vojtech Pavlik <> | Subject | Re: [2.6.0-test11] VIA IDE DMA problems with sleeping harddisk |
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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 > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Vojtech Pavlik SuSE Labs, SuSE CR - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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