Re: Kernel 2.4.17 with VT8367 [KT266] crashes on heavy ide load

[Mark Cooke]

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On Mon, 1 Apr 2002, David Härdeman wrote:

> Date: Mon, 01 Apr 2002 18:33:04 +0200
> From: David Härdeman <[e-mail]>
> To: Mark Cooke <[e-mail]>
> Cc: LinuxKernel <[e-mail]>
> Subject: Re: Kernel 2.4.17 with VT8367 [KT266] crashes on heavy ide load
>     togeter
> 
> Mark Cooke wrote:
> 
> > If I run a simultaneous one on hdc and hde, the combined rate tops 
> > out at 50MB again.  Hence, the limitation isn't the raid card.  Or at 
> > least I'd be exceedingly surprised.
> 
> The bugs that exist in VIA chipsets and Barracuda drives have already 
> exceedingly surprised me many, many times :-)

Agreed.

> I have done some dumping on the via chipset and this what I've come up 
> with is available (in a cooked format) at:
> http://www.student.nada.kth.se/~i99_hnd/via/
> 
> I hope that this is useful in some way for you?.

Yes.  It's interesting that comparing the differences in north bridge
registers between windows unpatched, and the latest 1.05 raid patch is
just register 0xb7 changing.  Perhaps I'll be 'brave/foolish' and just
twiddle it with setpci after backing up.  Do you have documentation 
for these registers ?  I've been kicking through via's site looking 
for chipset datasheets to no avail.

I toasted one of my raid disks trying to get Win98se installed over
the weekend to do similar testing here.  Didn't like the size of the
disk I tried to install it to, and I ended up with a zapped partition
table and who knows what else.  Thankfully the software raid 5 coped
perfectly (thanks guys!) and the system was back after the rebuild
time.

I've a spare (small) disk to try this with my system today or
tomorrow.  Which ABit bios are you using on that test system currently
?  I put the newest ABios bios (7P vs 65)  on my system (KT7A-RAID
v1.3)  and it appears to have gained me about 3-4MB/sec over the PCI
bus. (54MB/sec vs 50MB/sec)

Attached files are my raw pci data for 00:0 and 00:1, for your 
reference.  It's different enough to your data that it's not easy
to compare though.

Cheers,

Mark

-- 
+-------------------------------------------------------------------------+
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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