Configure IOQ defaults

1 files changed, 34 insertions, 0 deletions

diff --git a/rel/overlay/etc/default.ini b/rel/overlay/etc/default.ini
index a1df0805a..f5f057859 100644
--- a/rel/overlay/etc/default.ini
+++ b/rel/overlay/etc/default.ini
@@ -512,6 +512,40 @@ min_priority = 2.0
 [smoosh.ratio_views]
 min_priority = 2.0
 
+[ioq]
+; The maximum number of concurrent in-flight IO requests that
+concurrency = 10
+
+; The fraction of the time that a background IO request will be selected
+; over an interactive IO request when both queues are non-empty
+ratio = 0.01
+
+[ioq.bypass]
+; System administrators can choose to submit specific classes of IO directly
+; to the underlying file descriptor or OS process, bypassing the queues
+; altogether. Installing a bypass can yield higher throughput and lower
+; latency, but relinquishes some control over prioritization. The following
+; classes are recognized with the following defaults:
+
+; Messages on their way to an external process (e.g., couchjs) are bypassed
+os_process = true
+
+; Disk IO fulfilling interactive read requests is bypassed
+read = true
+
+; Disk IO required to update a database is bypassed
+write = true
+
+; Disk IO required to update views and other secondary indexes is bypassed
+view_update = true
+
+; Disk IO issued by the background replication processes that fix any
+; inconsistencies between shard copies is queued
+shard_sync = false
+
+; Disk IO issued by compaction jobs is queued
+compaction = false
+
 [dreyfus]
 ; The name and location of the Clouseau Java service required to
 ; enable Search functionality.