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ext3/kjournald overhead


I've recently installed ext3 on an 800MB RAID5
(software) array.  I am running RedHat Linux 7.1 with
the Linux kernel 2.4.12-ac3 on a 1GHz Pentium system
with 128MB RAM.  I am seeing a significant amount of
write operation slowdown when running ext3 (and
kjournald), as opposed to my old ext2.  The problem
seems to be associated with the times that kjournald
is accessing the disk.  At those moments, my CPU
utilization peaks, and network transfer is nearly
halted until kjournald is finished. 

I read in an archive of a Linux Symposium on 20 July,
2000 by Dr. Stephen Tweedie that, at that time, actual
file data was being journaled as opposed to just
metadata.  It looked like the plan was to fix that. 
Has this been done?  If so, what else can I do to
relieve this bottleneck?

I'm using this machine as a DV file repository, and am
capturing video to it in real-time, so any delay
spoils the capture session.  Any clues?


-Carlos Knowlton
carlosknowlton yahoo com

PS I am not subscribed to this list, so please CC me
if you reply.  Thanks!

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