Aaron Lehmann wrote:
>
> [I've CC'd Andre Hedrick in because this is an IDE issue
>
> Summary: my new hard drive locks up the system sometimes for 5-10 seconds
> during heavy I/O]
>
> The drive is in DMA mode. The problem started a few weeks ago when a got a
> new hard drive (Maxtor 13GB UDMA/33). For some reason, the kernel doesnt
> turn on DMA automatically even though it is configured to, but I use
> hdparm for it. If I run bonnie or do a similarly large i/o operation onto
> /dev/hdc (the new maxtor drive), the machine freezes up randomly for a few
> seconds at a time.
>
> Jul 12 18:47:59 vitelus kernel: SIS5513: IDE controller on PCI bus 00 dev
> 09
> Jul 12 18:47:59 vitelus kernel: SIS5513: not 100% native mode: will probe
> irqs later
>
> So obviously the controller is a SIS5513.
>
> I used this hard drive for a few days on another system with a VIA IDE
> controller (from /proc/pci: IDE interface: VIA Technologies VT 82C586
> Apollo IDE (rev 6)), in both UDMA and interrupt-driven mode, in both
> 2.0.36 and 2.2.9 but didn't experience any similarly huge lockups. Kernel
> version on this machine is 2.2.10-tmw1 (the tmw patch should not affect
> the IDE at all). I never experienced any of these lockups using the old
> hard drive.
>
> [root@vitelus aaronl]# hdparm /dev/hdc
> /dev/hdc:
> multcount = 0 (off)
> I/O support = 0 (default 16-bit)
> unmaskirq = 0 (off)
> using_dma = 1 (on)
> keepsettings = 0 (off)
> nowerr = 0 (off)
> readonly = 0 (off)
> readahead = 8 (on)
> geometry = 25249/16/63, sectors = 25450992, start = 0
>
> Should I try enabling unmaskirq?
>
> On Thu, 15 Jul 1999, Mark Hahn wrote:
>
> > > > Yes, try unmasking IRQ's on the CD-ROM with hdparm.
> > >
> > > Interesting, since my machine locks up for up to 10 seconds at a time
> > > during heavy IDE activity, do you think this would help me too? The
> > > manpage mentions that it is "dangerous".
> >
> > unless you have a rather old machine, your problem is probably
> > just a misconfigration of ide. the "locking up" could only be
> > due to an astonishingly slow, and large PIO IDE transaction. all
> > hardware made in the past 5 years or so supports at least DMA mode,
> > which runs at least 12 MB/s; you have to scrape to find anything
> > that doesn't do UDMA these days.
> >
> > take a look at your disk/controller settings with hdparm.
> >
>
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---- mpb
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