[mythtv-users] Software changes required when switching CPU from single-core to multi-core?

[Douglas Clowes]

On 2011-05-27 05:37, Craig Huff wrote:
>
> > >> the mythtv wiki has good info on XFS,
>
> I'm afraid I didn't make myself clear. My video drives are all 
> formatted with Journalling File System (JFS), _not_ XFS.
>
> Can anyone answer any of the questions I raised in my last post in 
> this thread? Sorry, not to restate them, but I don't have the 
> dexterity (or is it the patience?) to do cut & paste in Android email.
>
> Craig.
>
>
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Gee Craig, I picked that up and I wasn't even paying attention. So it 
must have been at least a little bit clear.

The program filefrag can give an indication of file fragmentation. Works 
on XFS and EXT, so probably works on JFS. Try it.

For example, to find the topp 100 fragmented files over 1G:

# find /storage/mythtv  -type f -size +1G -exec filefrag {} \; | sort 
-t: -nk2 | tail -n100

and "if it aint broke, don't fix it"!

If you have one or more heavily fragmented files, according to your 
taste/laziness, I have a remap.sh script that I use when xfs_fsr doesn't 
do the job on my heavily fragmented and very full disks:

#!/bin/bash
file="$*"
if [ ! -e "${file}" ]
then
   echo "\"${file}\" does not exist"
   exit 1
fi
echo "\"${file}\""
#ls -lh "${file}"
old_size=`ls -ld ${file} | cut -d ' ' -f 5`
old_frag="`filefrag "${file}" | cut -d ':' -f 2 | cut -d ' ' -f 2`"
old_rate=`expr $old_size \/ $old_frag`
mv "${file}" "${file}.bck"
cp -a "${file}.bck" "${file}"
#ls -lh "${file}"
new_size=`ls -ld ${file} | cut -d ' ' -f 5`
new_frag="`filefrag "${file}" | cut -d ':' -f 2 | cut -d ' ' -f 2`"
new_rate=`expr $new_size \/ $new_frag`
echo "${old_size} => ${new_size} bytes"
echo "${old_frag} => ${new_frag} extents"
echo "${old_rate} => ${new_rate} ratio"
echo "diff \"${file}\" \"${file}.bck\""
echo "ls -l \"${file}\" \"${file}.bck\""
echo "rm -i \"${file}.bck\""

This renames the file to <name>.bck, copies it back to the original 
file, shows you how it went and gives you a selection of commands. Your 
level of paranoia will determine whether you compare the files, "ls -l" 
them or just remove the original file.

As usual on linux, there are at least sixteen ways to do anything - this 
has been one of them.

And, as for the DMA timeout - sorry, can't help you :(

Cheers,

Douglas
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