[debian-knoppix] Knoppix kernel tree ?
Hi,
The question is : which source ttree is used for Knoppix 3.2 ?
And here is the story :
I've an Asus P5A motherboard with a K6-2-500MHz processor.
I bought a new WDC Caviar 40Gb hdd. Due to the 32Gb limitation the BIOS
does not found this disk. So I said 'None' in the Bios setup. Linux can
find the disk and I can enable dma with it but not udma2 (it is udma2
capable, at least). When I try to setup the udma2 mode, I get :
[root@tangerine] /home/jean-luc # hdparm -X udma2 /dev/hdb
/dev/hdb:
setting xfermode to 66 (UltraDMA mode2)
Seems to be fine, but when I list the modes of the diisk, it is still
in mdma2 mode :
[root@tangerine] /home/jean-luc # hdparm -I /dev/hdb
/dev/hdb:
ATA device, with non-removable media
Model Number: WDC
WD400BB-00DEA0 Serial Number:
WD-WCAD17328519
Firmware Revision: 05.03E05
Standards:
Supported: 5 4 3 2 Likely used: 6
...
DMA: mdma0 mdma1 *mdma2 udma0 udma1 udma2 udma3 udma4
udma5 Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
...
If I try to measure the speed with hdpar -tT /dev/hdb, I get a
throughput of about 14Mb/s
The interesting part is here :
If I boot Knoppix 3.2 from the CDROM, I can enable the udma2 mode and
the throughput is about 23Mb/s. A noticable improvement.
So, I've done the following test : I unpacked a cleane / genuine kernel
2.4.20, I got the config file found in /boot in knoppix and I built a
kernel with this config file...
I booted this kernel but I didnt manage to set udma2 mode.
So the question is : what is special in Knoppix that allows to switch
udma2 and that I cannot do on my Debian sid system ?
The version od hdparm is the same on the Knoppix CD and on my Debian.
Any idea ?
---
Regards
jean-Luc
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