Just to add, if one needs to check how effective the sysctl's are, I
suggest the following:

watch -n 1 grep -A 1 dirty /proc/vmstat

also if one wants to see which blocks are being flushed and by which
process one can do:

sudo echo 1 > /proc/sys/vm/block_dump

and looking at the output from dmesg will show that the data is being
flushed out.

There still seems to be a bit of delay in fully flushing blocks out with
the suggested sysctl's. I've fiddled with various settings but I could
not seem to improve things.

-- 
wubi install unusable - Buffer I/O error on device loop0
https://bugs.launchpad.net/bugs/204133
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