Re: long raidctl initialization times

["Niall James O'Higgins" <njo_(_at_)_sig11_(_dot_)_com>]

On Fri, Aug 13, 2004 at 09:45:57AM -0700, Aaron Glenn wrote:
> On Fri, 13 Aug 2004 09:32:13 +0100, Niall James O'Higgins <njo_(_at_)_sig11_(_dot_)_com> wrote:
> > A dmesg would tell you what mode the disks were configured to run in. I'm
> > sure its possible they are set to run very slowly.
> 
> dmesg:
> OpenBSD 3.5 (RAIDCTL) #0: Fri Aug 13 19:47:27 PDT 2004
>       root_(_at_)_sharpie_(_dot_)_ipcolo_(_dot_)_lsanca01_(_dot_)_wavestream_(_dot_)_net:/usr/src/sys/arch/i386/compile/RAIDCTL
> cpu0: Intel(R) Pentium(R) 4 CPU 2.80GHz ("GenuineIntel" 686-class) 2.80GHz
> <....>
> vendor "Intel", unknown product 0x25ab (class system subclass
> miscellaneous, rev 0x02) at pci0 dev 29 function 4 not configured
> vendor "Intel", unknown product 0x25ac (class system subclass
> miscellaneous, rev 0x02) at pci0 dev 29 function 5 not configured
> vendor "Intel", unknown product 0x25ad (class system subclass
> miscellaneous, rev 0x02) at pci0 dev 29 function 7 not configured
> <...>
> pciide0 at pci0 dev 31 function 2 vendor "Intel,unknown product 0x25a3
> rev 0x02: DMA (unsupported), channel 0 configured to compatibility,
> channel 1 configured to compatibility
> atapiscsi0 at pciide0 channel 0 drive 0
> scsibus0 at atapiscsi0: 2 targets
> wd0 at pciide0 channel1 drive 0: <WDC WD740GD-00FLA0>
> wd0: 16-sector PIO, LBA48, 70811MB, 145226112 sectors
> wd1 at pciide0 channel1 drive 1: <WDC WD740GD-00FLA0>
> wd1: 16-sector PIO, LBA48, 70811MB, 145226112 sectors
> <...>

You actually didn't include the part of the dmesg which gives the 
mode the disk is in fact using. For example on one machine I have:

wd0(pciide1:0:0): using PIO mode 4, Ultra-DMA mode 6

On another (much older) machine I have:

wd0(pciide0:0:0): using PIO mode 4, DMA mode 2

This line is what interests you. I suspect that your disks
are indeed being set to a slower fall-back compatibility mode which is
the source of your poor performance.

> How can I force it to set the correct mode on the disks? And is it
> possible to add the PCI ID's to pcidevs.h and recompile my kernel?

Perhaps the controller you are using isn't supported properly by the
kernel yet; a driver might need to be written.

// Niall.

-- 
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