I saw similar issues with a KT133A-RAID board. The latest BIOS from
ABit appear to have helped fix this problem here, as does the VIA fix
to register 0x55.
Before this, I was seeing hard freezes when using software raid-5 too.
I still see a very occasional glitch where the machine appears to get
stuck doing a repeated bus-master transfer. The last occurance was a
hard loop with the sound card repeating the same ~ 0.5 seconds over
and over, but the machine was entirely frozen, with no sysrq / network
00:00.0 Host bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133] (rev 03)
00:01.0 PCI bridge: VIA Technologies, Inc. VT8363/8365 [KT133/KM133 AGP]
00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South] (rev 40)
00:07.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06)
00:07.2 USB Controller: VIA Technologies, Inc. UHCI USB (rev 1a)
00:07.3 USB Controller: VIA Technologies, Inc. UHCI USB (rev 1a)
00:07.4 Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 40)
00:08.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
00:0b.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 30)
00:0f.0 Multimedia audio controller: Trident Microsystems 4DWave DX (rev 02)
00:11.0 Multimedia video controller: Brooktree Corporation Bt848 TV with DMA push (rev 12)
00:13.0 Unknown mass storage controller: HighPoint Technologies, Inc. HPT366/370 UltraDMA 66/100 IDE Controller (rev 04)
01:00.0 VGA compatible controller: nVidia Corporation NV11 DDR (rev b2)
and also from the startup dmesg, the message about the memory write
queue, which is known to cause corruption and freezes if it's not
Disabling VIA memory write queue:  89->09
I'm using 2.4.19-pre3 with AlanC's pre4 patch ontop of that with good
success. You might try one of the very latest kernels as the via fix
was pretty recent.
I would say that my experience with this via chipset has put me off
their product for future purchases.
The read performance of my raid-5 partition is only around 50MB/sec,
when the individual drives all produce 40MB/sec, and this does seem
very strongly dependent on the PCI options in the BIOS.
It is still well below the 60-80MB/sec I was hoping to see. (Based
approximately on total theoretical pci bandwidth * 66% for my 3 disk
raid-5 setup, with each disk on an individual chain.) Note I did
isolate the raid-5 from causing problems by monitoring the overall
transfer rates running parallel read tests against each disk, as well
as an overall read test against the md device. Virtually no
Note there is a windows-only patch available on viaarena.com that
claims to really improve PCI burst transfer bandwidth, but my attempts
to contact the author for details of what that patch actually does
have so far gone unanswered.
Via Patch: http://www.viaarena.com/?PageID=66#raid
Post Patch: http://www.tecchannel.de/hardware/817/11.html
On Tue, 26 Mar 2002, Kai-Boris Schad wrote:
> Hi !
> I have problems with PC mainboard using the Via VT8367 [KT266] chipset.
> lspci shows the configuration:
> 00:00.0 Host bridge: VIA Technologies, Inc. VT8367 [KT266]
> 00:01.0 PCI bridge: VIA Technologies, Inc. VT8367 [KT266 AGP]
> 00:0c.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139 (rev 10)
> 00:0e.0 Unknown mass storage controller: Promise Technology, Inc. 20268 (rev
> 01)00:0f.0 Unknown mass storage controller: Promise Technology, Inc. 20268
> (rev 01)00:11.0 ISA bridge: VIA Technologies, Inc. VT8233 PCI to ISA Bridge
> 00:11.1 IDE interface: VIA Technologies, Inc. Bus Master IDE (rev 06)
> 01:00.0 VGA compatible controller: ATI Technologies Inc Rage XL AGP (rev 27)
> The CPU is a 1400MHz Athlon.
> We use this system for a software Raid 5. If we produce heavy load on the
> disks and network the system hangs. There is no log of errors at all. We
> tried to change the network card form a 3com to a rtl83xx. The system remains
> a litle longer stable but crashes then too. We also tried to have the
> harddisks on seperate ide channels but this didn't solve the crashs.
> It seems to be something with the dma, because if we disable the dma of the
> harddisks the system is stable. Does anybody also recognise this problem ?
> Is there any solution for this effect ?
> Thanks a lot
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-- +-------------------------------------------------------------------------+ Mark Cooke The views expressed above are mine and are not Systems Programmer necessarily representative of university policy University Of Birmingham URL: http://www.sr.bham.ac.uk/~mpc/ +-------------------------------------------------------------------------+
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