IDE performance of kernel 2.6.8 slower than 2.4.26

[Helmut Wollmersdorfer <helmut.wollmersdorfer@xxxxxx>]

After upgrade from kernel 2.4.26 to kernel 2.6.8 the performance of IDE 
harddisks dropped down -30% on some of my boxes with a specific chipset.

This is a known problem, see http://kerneltrap.org/node/2251

The affected chipset is

via2:~# lspci
0000:00:00.0 Host bridge: VIA Technologies, Inc. VT8623 [Apollo CLE266]
0000:00:01.0 PCI bridge: VIA Technologies, Inc. VT8633 [Apollo Pro266 AGP]
0000:00:0d.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host 
Controller (rev 80)
0000:00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 
1.1 Controller (rev 80)
0000:00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 
1.1 Controller (rev 80)
0000:00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 
1.1 Controller (rev 80)
0000:00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82)
0000:00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
0000:00:11.1 IDE interface: VIA Technologies, Inc. 
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
[...]

Does somebody know, if this problem is resolved, in which kernel 
version, or in which of the kernel mailing lists I can get more 
information about the state of the problem?

TIA

Helmut Wollmersdorfer


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