Bug#425355: Acknowledgement (dpt_i2o - disk IO causes very high load)
On Wed, Jun 13, 2007 at 09:31:35PM +0200, Peter Hirdina wrote:
> Some additional information about my system:
>
> * Tyan Tiger MPX (AMD760MPX Chipset)
> * 2x Athlon MP 2800+
> * 2GB registered ECC RAM
> * Adaptec 2400A with 4 disks configured as RAID-5
>
> I know about the PCI performance problems of the 768 southbridge. From
> what I've read on the net so far, it seems that only write performance
> is really affected, being limited to ~25MB/s. Read Performance seems to
> be OK.
>
> If I compare those values with the ones I get from system, then I'm
> quite disappointed. I can hardly squeeze 15MB/s out of my RAID (shared
> betweend reads and writes). So if I copy a file on the RAID from one
> directory to another, this works at a whopping speed of ~7MB/s.
>
> Also if read on the net, that the primary PCI bus on the MPX platform
> doesn't have those problems, and a lot of people were seeing drastic
> performance improvements when they moved their PCI cards to the 64bit
> slots. I tried that as well, but the difference is hardly worth
> mentioning (performance improved to around 17MB/s).
>
> So my conclusion is, that there is something else wrong here.
Does this error still occur with more recent kernel versions?
If you're running Etch, could you try to reproduce this bug
with the 2.6.24 based kernel added in 4.0r4?
http://packages.qa.debian.org/l/linux-2.6.24.html
Cheers,
Moritz
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