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Re: dvd burner - really slow response



In message <20050107042053 GA14387 devserv devel redhat com>you write:
>On Thu, Jan 06, 2005 at 07:39:02PM -0800, steve_dum mentorg com wrote:
>> If I put a dvd in my drive, fire up k3b and ask for disk info k3b goes away
>> for 7 minutes -- SEVEN MINUTES -- and then comes back and and shows the disk
> 
>> info.   Same disk on a RH 8 system comes back in a few seconds.
>
>Does it do the same as root. Does it do the same if you stop haldaemon first.
>(I'd be suprised if either make a difference but just to be sure). If it
>doesn't then strace might give clues as to what is being slow

as root and with haldaemon stopped it behaves the same.
strace shows that it's in a loop, it does a brk, then about 30 ioctls
and repeats.

brk(0x9528000)                          = 0x9528000
ioctl(19, CDROM_SEND_PACKET, 0xfefa0110) = 0
ioctl(19, CDROM_SEND_PACKET, 0xfefa02a0) = 0
ioctl(19, CDROM_SEND_PACKET, 0xfefa02a0) = 0
...

steve

>
>> The above is a specific behavior, but in general reading or writing dvd's
>> takes forever.  Drive worked fine under FC1.  
>> 
>> Reading/writing cd-r media doesn't show these excessive delays but also
>> is slower than under FC1.  While waiting, the drive activity light tends to
>> be either off, or occasionally blinking, but not constantly busy.
>
>Interesting. The reading side I could believe was hal or similar but I don't
>understand why it would mostly hit DVD. We really don't do much different 
>for the two cases.
>
>


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