Re: 2.6.0-test9 breaks cdrecord w. ide-scsi device

[P. Christeas]

> Hello
>
> ...
>  
> There is now ide-cd writing support, and cdrecord 2 supports it. I build
> that stuff modular, so I just load the ide-cd and isofs modules (modprobe
> takes care of the rest). I achieve the fastest writing speeds I've ever
> had, using this driver. Far better than ide-scsi or even Sleazy CD Creator
> in Windows.
>
>...

Tried it. Now used /dev/hdd there..
This time it worked a few times and some other times it failed. 
It now seems that I got a buffer underrun, although I do have 'realtime 
priority' for the process.
Note that I'm not using 'burnfree'. That's why I have linux anyway :) .

Can anybody examine why is the buffer of cdrecord less than 100% with 
RR-scheduling? That would never happen in 2.4, cdrecord 1.10 ..


Track 10:   25 of   32 MB written (fifo  25%) [buf  94%]  15.8x.cdrecord: 
Success. write_g1: scsi sendcmd: no error
CDB:  2A 00 00 02 3C 76 00 00 1B 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: F1 00 05 00 32 35 73 0E 00 00 00 00 21 02 00 00
Sense Key: 0x5 Illegal Request, deferred error, Segment 0
Sense Code: 0x21 Qual 0x02 (invalid address for write) Fru 0x0
Sense flags: Blk 3290483 (valid)
resid: 63504
cmd finished after 0.006s timeout 200s

write track data: error after 27179712 bytes
cdrecord: The current problem looks like a buffer underrun.
cdrecord: Try to use 'driveropts=burnfree'.
cdrecord: Make sure that you are root, enable DMA and check your HW/OS set up.
cdrecord: Success. test unit ready: scsi sendcmd: no error
CDB:  00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 02 00 00 00 00 0E 00 00 00 00 30 00 00 00
Sense Key: 0x2 Not Ready, Segment 0
Sense Code: 0x30 Qual 0x00 (incompatible medium installed) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.005s timeout 200s
Writing  time:  139.113s
Average write speed  32.0x.
Min drive buffer fill was 80%
Fixating...
WARNING: Some drives don't like fixation in dummy mode.
cdrecord: Success. flush cache: scsi sendcmd: no error
CDB:  35 00 00 00 00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 02 00 00 00 00 0E 00 00 00 00 30 00 00 00
Sense Key: 0x2 Not Ready, Segment 0
Sense Code: 0x30 Qual 0x00 (incompatible medium installed) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.005s timeout 200s
Trouble flushing the cache
cdrecord: Success. test unit ready: scsi sendcmd: no error
CDB:  00 00 00 00 00 00
status: 0x2 (CHECK CONDITION)
Sense Bytes: 70 00 02 00 00 00 00 0E 00 00 00 00 30 00 00 00
Sense Key: 0x2 Not Ready, Segment 0
Sense Code: 0x30 Qual 0x00 (incompatible medium installed) Fru 0x0
Sense flags: Blk 0 (not valid)
cmd finished after 0.006s timeout 200s
Fixating time:   26.117s


hdparm:
IO_support   =  3 (32-bit w/sync)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  1 (on)

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