Default to zvol_request_async=0

Change the default ZVOL behavior so requests are handled asynchronously. This behavior is functionally the same as in the zfs-0.6.4 release. Reviewed-by: Chunwei Chen <david.chen@osnexus.com> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #5902
openzfs · May 4, 2017 · 8fa5250 · 8fa5250
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diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5
@@ -2060,7 +2060,7 @@ effectively limits the queue depth to 1 for each I/O submitter.  When set
 to 0 requests are handled asynchronously by a thread pool.  The number of
 requests which can be handled concurrently is controller by \fBzvol_threads\fR.
 .sp
-Default value: \fB1\fR.
+Default value: \fB0\fR.
 .RE
 
 .sp

diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
@@ -57,7 +57,7 @@
 unsigned int zvol_inhibit_dev = 0;
 unsigned int zvol_major = ZVOL_MAJOR;
 unsigned int zvol_threads = 32;
-unsigned int zvol_request_sync = 1;
+unsigned int zvol_request_sync = 0;
 unsigned int zvol_prefetch_bytes = (128 * 1024);
 unsigned long zvol_max_discard_blocks = 16384;