fc6 dvd read performance degrades with mkisofs joliet option

[Skunk Worx]

Hi,

I use FC6 to master DVDs and have noticed if I add the -J option to the 
mkisofs command the read performance on the final dvd is severely degraded.

For example mastering a DVD image with RockRidge and ISO9660 alone 
yields about 200 mb./minute read performance on my media.

Adding the Joliet option to mkisofs command line degrades the read 
performance on the final dvd to about 75 mb. per minute.

Is this expected behavior? I used the same media and drive (dvd-rw) and 
blanked with /dev/zero between cycles then duplicated the test twice to 
be sure.

Thanks,
John

[Skunk Worx]

Skunk Worx wrote:
>  
>  Adding the Joliet option to mkisofs command line degrades the read 
>  performance on the final dvd to about 75 mb. per minute.
>   
This problem is specific to a vendor/model of server. I will dig into it 
this week and find out if there are any f/w updates for the DVD drive or 
mobo, then post more when I know more.

---
John

[Mogens Kjaer]

Skunk Worx wrote:
>  Hi,
>  
>  I use FC6 to master DVDs and have noticed if I add the -J option to the 
>  mkisofs command the read performance on the final dvd is severely degraded.
>  
>  For example mastering a DVD image with RockRidge and ISO9660 alone 
>  yields about 200 mb./minute read performance on my media. 
What does the DVD contain? How many files:

cd /thedvd
find . -type f | wc

Mogens
-- 
Mogens Kjaer, Carlsberg A/S, Computer Department
Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark
Phone: [phone], Fax: [phone]
Email: mk(a)crc.dk Homepage: http://www.crc.dk

[Skunk Worx]

Mogens Kjaer wrote:
>  Skunk Worx wrote:
> > Hi,
> >
> > I use FC6 to master DVDs and have noticed if I add the -J option to 
> > the mkisofs command the read performance on the final dvd is severely 
> > degraded.
> >
> > For example mastering a DVD image with RockRidge and ISO9660 alone 
> > yields about 200 mb./minute read performance on my media.
>  
>  What does the DVD contain? How many files:
>  
>  cd /thedvd
>  find . -type f | wc
>   
I added the "-l" option to wc :

test 1 : 153163 files (1.2 gb. data)
test 2 : 10     files (3.2 gb. data)

I wanted to use a mix of media and file counts for testing.

The read performance is consistently good on my home machines (mac 
mini/OSX tiger) and my FC6 boxes.

I tested four blades at work yesterday (all same vendor/model) and they 
all drop to 30%, sometimes 20%, read performance with Joliet enabled.

Will start digging into the f/w updates for the blade mobos and dvd 
readers tomorrow. It gets a little weird because we are testing a known 
buggy 3rd party kernel driver and pci card in them.

I don't want to talk the the vendor until I eliminate those from the 
equation.

---
John

[Skunk Worx]

Skunk Worx wrote:
>  Mogens Kjaer wrote:
> > Skunk Worx wrote:
> >> Hi,
> >>
> >> I use FC6 to master DVDs and have noticed if I add the -J option to 
> >> the mkisofs command the read performance on the final dvd is severely 
> >> degraded.
> >>
>  
>  I tested four blades at work yesterday (all same vendor/model) and they 
>  all drop to 30%, sometimes 20%, read performance with Joliet enabled.
>  
>  Will start digging into the f/w updates for the blade mobos and dvd 
>  readers tomorrow. It gets a little weird because we are testing a known 
>  buggy 3rd party kernel driver and pci card in them.
>  
>  
>  ---
>  John
>   
Posting for completion. This was H/W related. Out of 12 servers tested, 
3 had problems reading at their rated speed. Sometimes it depended on 
the media.

One unit (the worst offender) started working properly after the drive 
was removed and reinstalled (perhaps the cables needed re-seating?)

Anyway, no real problem here.

---
John