Author: mav
Date: Wed Oct 14 10:21:21 2015
New Revision: 289304
URL: https://svnweb.freebsd.org/changeset/base/289304

Log:
  6293 ztest failure: error == 28 (0xc == 0x1c) in ztest_tx_assign()
  
  Reviewed by: George Wilson <[email protected]>
  Reviewed by: Prakash Surya <[email protected]>
  Reviewed by: Richard Elling <[email protected]>
  Approved by: Richard Lowe <[email protected]>
  Author: Matthew Ahrens <[email protected]>
  
  illumos/illumos-gate@8fe00bfb8790ad51653f67b01d5ac14256cbb404

Modified:
  vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c

Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c     Wed Oct 14 10:01:08 
2015        (r289303)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/arc.c     Wed Oct 14 10:21:21 
2015        (r289304)
@@ -5021,6 +5021,16 @@ arc_init(void)
        arc_c_max = MAX(allmem * 3 / 4, arc_c_max);
 
        /*
+        * In userland, there's only the memory pressure that we artificially
+        * create (see arc_available_memory()).  Don't let arc_c get too
+        * small, because it can cause transactions to be larger than
+        * arc_c, causing arc_tempreserve_space() to fail.
+        */
+#ifndef _KERNEL
+       arc_c_min = arc_c_max / 2;
+#endif
+
+       /*
         * Allow the tunables to override our calculations if they are
         * reasonable (ie. over 64MB)
         */
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