Re: userland falling over from pata writes on a 4.x box

[buhrow%lothlorien.nfbcal.org@localhost (Brian Buhrow)]

        Hello.  Is the motherboard really only capable of running the disks
at UDMA mode 2(33 Mbits/sec)?  That seems really slow! even for a board of
that era.  Perhaps the PATA cable went bad?

-thanks
-Brian

On Jan 8,  5:50pm, Daniel Hagerty wrote:
} Subject: userland falling over from pata writes on a 4.x box
}     I have an old p2-450 box on an p2b-s motherboard running the head
} of netbsd-4 from last march or so.  I just saw it's userland fall over
} while doing heavy writes to one of its PATA disk.  For example,
} getting an ssh banner string via telnet from another machine measured
} in minutes.  This was part of a broader bit shuffle, and it was only
} writes to the pata disk that were so obviously pathological.
} 
}     This is not my memory of how it used to behave, but it's been a
} long time since the machine has been regularly used for I/O intensive
} work.
} 
}     The salient bits from dmesg are appended to this message.
} 
}     I'm particularly concerned that it's reporting the piixide as
} wired to compatability mode, which is not what I remember from the
} distant past.  I can't find anything in its bios mentioning legacy ide
} vs pci ide, merely an enable both/primary/secondary/neither and knobs
} for which dma + pio modes to use.
} 
}     Short of upgrading the machine, any ideas what to look at?
} 
} NetBSD 4.0_STABLE (PERDITION) #0: Mon Mar  8 09:49:52 EST 2010
} [...]
} piixide0 at pci0 dev 4 function 1
} piixide0: Intel 82371AB IDE controller (PIIX4) (rev. 0x01)
} piixide0: bus-master DMA support present
} piixide0: primary channel wired to compatibility mode
} piixide0: primary channel interrupting at irq 14
} atabus0 at piixide0 channel 0
} piixide0: secondary channel wired to compatibility mode
} piixide0: secondary channel interrupting at irq 15
} atabus1 at piixide0 channel 1
} [...]
} satalink0 at pci0 dev 9 function 0
} satalink0: Silicon Image SATALink 3112 (rev. 0x02)
} satalink0: SATALink BA5 register space disabled
} satalink0: bus-master DMA support present
} satalink0: primary channel wired to native-PCI mode
} satalink0: using irq 5 for native-PCI interrupt
} atabus2 at satalink0 channel 0
} satalink0: secondary channel wired to native-PCI mode
} atabus3 at satalink0 channel 1
} [...]
} satalink0: port 0: device present, speed: 1.5Gb/s
} satalink0: port 1: device present, speed: 1.5Gb/s
} atapibus0 at atabus0: 2 targets
} cd0 at atapibus0 drive 1: <MAD DOG MD-16XDVD9A4, , 1.F0> cdrom removable
} cd0: 32-bit data port
} cd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 2 (Ultra/33)
} wd0 at atabus0 drive 0: <ST360021A>
} wd0: drive supports 16-sector PIO transfers, LBA addressing
} wd0: 57241 MB, 116301 cyl, 16 head, 63 sec, 512 bytes/sect x 117231408 sectors
} wd0: 32-bit data port
} wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 5 (Ultra/100)
} wd0(piixide0:0:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
} cd0(piixide0:0:1): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
} wd1 at atabus1 drive 0: <Maxtor 6L100P0>
} wd1: drive supports 16-sector PIO transfers, LBA addressing
} wd1: 95611 MB, 194259 cyl, 16 head, 63 sec, 512 bytes/sect x 195813072 sectors
} wd1: 32-bit data port
} wd1: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
} wd1(piixide0:1:0): using PIO mode 4, Ultra-DMA mode 2 (Ultra/33) (using DMA)
} wd2 at atabus2 drive 0: <ST3808110AS>
} wd2: quirks 2<FORCE_LBA48>
} wd2: drive supports 16-sector PIO transfers, LBA48 addressing
} wd2: 76319 MB, 155061 cyl, 16 head, 63 sec, 512 bytes/sect x 156301488 sectors
} wd2: 32-bit data port
} wd2: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
} wd2(satalink0:0:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
} wd3 at atabus3 drive 0: <ST3808110AS>
} wd3: quirks 2<FORCE_LBA48>
} wd3: drive supports 16-sector PIO transfers, LBA48 addressing
} wd3: 76319 MB, 155061 cyl, 16 head, 63 sec, 512 bytes/sect x 156301488 sectors
} wd3: 32-bit data port
} wd3: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 6 (Ultra/133)
} wd3(satalink0:1:0): using PIO mode 4, Ultra-DMA mode 6 (Ultra/133) (using DMA)
>-- End of excerpt from Daniel Hagerty