On 08/26/2014 08:58 AM, Chris Friesen wrote:
What I'd like to see (and may take a stab at implementing) is a cap on
either inflight bytes or inflight IOPS. One complication is that this
requires hooking into the completion path to update the stats (and
possibly unblock the I/O code) when an operation is done.
Well, it looks like I won't be taking a stab at this after all.
It seems that modifying qemu to call mallopt() to set the trim/mmap
thresholds to 128K is enough to minimize the increase in RSS and also
drop it back down after an I/O burst. For now this looks like it should
be sufficient for our purposes.
I'm actually a bit surprised I didn't have to go lower, but it seems to
work for both "dd" and dbench testcases so we'll give it a try.
Chris
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