> I spent a bunch of time hammering on different ways to fix this without
quoted text
> increasing nr_requests, and it was a mixture of needing better tuning in
> btrfs and needing to init mapping->writeback_index on inode allocation.
> 
> So, today's numbers for creating 30 kernel trees in sequence:
> 
> Btrfs defaults                  57.41 MB/s
> Btrfs dup no csum               74.59 MB/s 
> Btrfs no duplication            76.83 MB/s
> Btrfs no dup no csum no inline  76.85 MB/s

What sort of script are you using?  Basically something like this?

for i in `seq 1 30` do
    mkdir $i; cd $i
    tar xjf /usr/src/linux-2.6.28.tar.bz2
    cd ..
done

						- Ted
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