kernel performance problem

[Andrew Smith <asmith@vtrl.co.uk>]

This is my first ever posting  to this list, so please excuse me if I've 
f**cked up and broken protocol.
I use an IDE LG DVD-RW drive for backup(GSA-4081B).
Back around 2.6.10 it wrote at typically 1.6-1.7x speed, but thereafter  
it dropped to  around 0.6-0.7 x.


%hdparm -I /dev/hdd

/dev/hdd:

ATAPI CD-ROM, with removable media
       Model Number:       HL-DT-ST DVDRAM GSA-4081B              
       Serial Number:      K2B3CFE4600        
       Firmware Revision:  A100   
Standards:
       Likely used CD-ROM ATAPI-1
Configuration:
       DRQ response: 50us.
       Packet size: 12 bytes
Capabilities:
       LBA, IORDY(can be disabled)
       DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2
            Cycle time: min=120ns recommended=120ns
       PIO: pio0 pio1 pio2 pio3 pio4
            Cycle time: no flow control=120ns  IORDY flow control=120ns
HW reset results:
       CBLID- below Vih
       Device num = 1


--
Andrew



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