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Subject2.5.46: ide-cd cdrecord (almost) success report
I felt like making some coasters tonight so I figured it was a good time
to give ide-cd a chance with cdrecord. For the most part, it worked
great! I was stunned, in fact, by how smoothly it went after I upgraded
my cdtools. I was running SMP + preempt and it wrote smoothly at 12x
with < 2% CPU usage the whole time. Buffer capacity never dropped below

I was almost disappointed at not making any coasters so I decided to
stress it a bit. I tried running 'make -j10 bzImage' on the 2.5.46
kernel tree while it was writing and that also worked! Buffer never
dropped below 96%. (This machine is 2x Xeon 450, 256 MB RAM, BTW.)

Still without coaster I tried one more thing...
'dd if=/dev/zero of=foo bs=1M' in parallel with another burn. That one
did it in. ;) I'm running ext3 and the writeout load totally killed
burn, which isn't surprising. I was asking for it, I know. What happened
when the cdrecord buffer underran was surprising, though: oops below.
Very repeatable. Can supply copious hw details if it helps.


Unable to handle kernel NULL pointer dereference at virtual address 00000000
printing eip:
*pde = 00000000
Oops: 0000
eepro100 mii
CPU: 0
EIP: 0060:[<c02464ad>] Not tainted
EFLAGS: 00010006
EIP is at ide_outsw+0xd/0x20
eax: 00007c00 ebx: 0000f801 ecx: 00007c00 edx: 00000170
esi: 00000000 edi: c0557d74 ebp: 00000000 esp: c04bfeb0
ds: 0068 es: 0068 ss: 0068
Process swapper (pid: 0, threadinfo=c04be000 task=c0491900)
Stack: c0557e20 c02469aa 00000170 00000000 00007c00 0000f801 c0557e20 c0557d74
00000000 c0246a7c c0557e20 00000000 00003e00 0000f800 c13820e0 00000000
c0557e20 c025571c c0557e20 00000000 0000f800 c13ad3a0 c0246a40 0000f800
Call Trace:
[<c02469aa>] ata_output_data+0xba/0xc0
[<c0246a7c>] atapi_output_bytes+0x3c/0x90
[<c025571c>] cdrom_newpc_intr+0x2ac/0x4e0
[<c0246a40>] atapi_output_bytes+0x0/0x90
[<c024cee4>] ide_intr+0x124/0x1e0
[<c0255470>] cdrom_newpc_intr+0x0/0x4e0
[<c010b595>] handle_IRQ_event+0x45/0x70
[<c010b834>] do_IRQ+0xb4/0x150
[<c0107070>] default_idle+0x0/0x50
[<c0107070>] default_idle+0x0/0x50
[<c0109e88>] common_interrupt+0x18/0x20
[<c0107070>] default_idle+0x0/0x50
[<c0107070>] default_idle+0x0/0x50
[<c010709a>] default_idle+0x2a/0x50
[<c010713a>] cpu_idle+0x3a/0x50
[<c0105000>] stext+0x0/0x30

Code: f3 66 6f 5e c3 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 8b
<0>Kernel panic: Aiee, killing interrupt handler!
In interrupt handler - not syncing

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