I split my root fs in half and made two identical copies - one on reiser and
one on xfs. I compiled a bunch of kernels, and tested some more.
A TCQ enabled kernel with AS, queue depth of 32 works fine on both reiser and
xfs. A TCQ enabled kernel with deadline, queue depth of 32 works fine on both
reiser and xfs. Note the depth of 32. I had TCQ enabled on previous <74
kernels and it worked fine, everywhere with depth 32.
However, the kernel that crashed was using the default
(The default is 8, even though the comment says 32).
I tested that kernel again with reiserfs, TCQ, the two elevators, and queue
depth 8 - on-boot fsck detects corruption every time, marks the system
unclean, and requires --rebuild-tree or --fix-fixable on any further mounts.
I now get "Wrong amount of used blocks." message.
Have not tested depth 8 TCQ kernel with xfs, since that's my surviving root
fs, and I'd like to avoid corruption there.
Have not tested queue depths other than 8 and 32.
I could test some more on reiser now that I have a backup root fs.
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