On 05/19/2014 06:55 PM, Kent Overstreet wrote:
...Changing it back to 25% doesn't do anything? _that_ is odd...
Can you send me the output of writeback_rate_debug? Check it once before you've
done anything, when things are working normally (after a fresh boot when
writeback_percent is nonzero, probably), then grab it again after you've set
writeback_percent to 0 and then back to 25, when it's still spinning.
I collected the requested data by logging both writeback_percent and
writeback_rate_debug every second. Every second also the cumulative CPU
usage of the bcache_writebac task is logged (as shown by ps -efw),
showing that the task is burning CPU cycles.
Both the collecting script and the log file can be found here:
https://bugzilla.kernel.org/show_bug.cgi?id=76391
Also, what kernel are you running?
As mentioned before, the kernel is Fedora kernel
kernel-3.14.4-200.fc20.x86_64
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