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virtual-host: More aggressive writeback of dirty #448

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virtual-host: More aggressive writeback of dirty #448

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9 changes: 9 additions & 0 deletions profiles/virtual-host/tuned.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,15 @@ summary=Optimize for running KVM guests
include=throughput-performance

[sysctl]
# If a workload mostly uses anonymous memory and it hits this limit, the entire
# working set is buffered for I/O, and any more write buffering would require
# swapping, so it's time to throttle writes until I/O can catch up. Workloads
# that mostly use file mappings may be able to use even higher values.
#
# The generator of dirty data starts writeback at this percentage (system default
# is 20%)
vm.dirty_ratio = 10

# Start background writeback (via writeback threads) at this percentage (system
# default is 10%)
vm.dirty_background_ratio = 5
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