diff --git a/lustre/tests/cfg/insanity-local.sh b/lustre/tests/cfg/insanity-local.sh
index d31c0890e6bc72d9005cdafdbdbb19ff3843586d..9a187c9c2ff2f6aabba560e6405a3f22738fe9fe 100644
--- a/lustre/tests/cfg/insanity-local.sh
+++ b/lustre/tests/cfg/insanity-local.sh
@@ -29,6 +29,7 @@ STRIPE_BYTES=${STRIPE_BYTES:-1048576}
 STRIPES_PER_OBJ=${STRIPES_PER_OBJ:-0}
 TIMEOUT=${TIMEOUT:-30}
 PTLDEBUG=${PTLDEBUG:-0x33f0404}
+DEBUG_SIZE=${DEBUG_SIZE:-10}
 SUBSYSTEM=${SUBSYSTEM:- 0xffb7e3ff}
 SINGLEMDS=${SINGLEMDS:-"mds1"}
 
diff --git a/lustre/tests/cfg/insanity-ltest.sh b/lustre/tests/cfg/insanity-ltest.sh
index 0a7e45b2f8632d7bd0c05db6fcb51b7e0c3da644..d7205c338135986341ba7629242d6ab00cb461c9 100644
--- a/lustre/tests/cfg/insanity-ltest.sh
+++ b/lustre/tests/cfg/insanity-ltest.sh
@@ -36,6 +36,7 @@ NETTYPE=${NETTYPE:-${NETTYPE}}
 
 TIMEOUT=${TIMEOUT:-30}
 PTLDEBUG=${PTLDEBUG:-0}
+DEBUG_SIZE=${DEBUG_SIZE:-10}
 SUBSYSTEM=${SUBSYSTEM:-0}
 MOUNT=${MOUNT:-${MOUNTPT}}
 #UPCALL=${CLIENT_UPCALL:-"${LUSTRE_TESTS}/replay-single-upcall.sh"}
diff --git a/lustre/tests/cfg/local.sh b/lustre/tests/cfg/local.sh
index 4e0443ccfb6e3f386324e0521ceea3eae3b9c819..a05d0ab6c31543ddad79ba8053ff3212ee0b39c4 100644
--- a/lustre/tests/cfg/local.sh
+++ b/lustre/tests/cfg/local.sh
@@ -35,6 +35,7 @@ STRIPES_PER_OBJ=${STRIPES_PER_OBJ:-0}
 SINGLEMDS=${SINGLEMDS:-"mds1"}
 TIMEOUT=${TIMEOUT:-20}
 PTLDEBUG=${PTLDEBUG:-0x33f0404}
+DEBUG_SIZE=${DEBUG_SIZE:-10}
 SUBSYSTEM=${SUBSYSTEM:- 0xffb7e3ff}
 
 MKFSOPT=""
diff --git a/lustre/tests/cfg/lov.sh b/lustre/tests/cfg/lov.sh
index 520a7a963a90d585d14c5b38e98a61e470211f36..ae693b19c4254b1e1e2f37c55e7236b81ed9c4de 100644
--- a/lustre/tests/cfg/lov.sh
+++ b/lustre/tests/cfg/lov.sh
@@ -29,6 +29,7 @@ STRIPE_BYTES=${STRIPE_BYTES:-1048576}
 STRIPES_PER_OBJ=${STRIPES_PER_OBJ:-$((OSTCOUNT -1))}
 TIMEOUT=${TIMEOUT:-20}
 PTLDEBUG=${PTLDEBUG:-0x33f0404}
+DEBUG_SIZE=${DEBUG_SIZE:-10}
 SUBSYSTEM=${SUBSYSTEM:- 0xffb7e3ff}
 
 MKFSOPT=""
diff --git a/lustre/tests/test-framework.sh b/lustre/tests/test-framework.sh
index 249719bb4f23f3dbc4dfbfb6e303b677b0fdb09f..ba9fa743134b3b076da97b4a5d8bac14d97c852f 100644
--- a/lustre/tests/test-framework.sh
+++ b/lustre/tests/test-framework.sh
@@ -343,6 +343,9 @@ start() {
     shift
     echo "Starting ${facet}: $@ ${device} ${MOUNT%/*}/${facet}"
     do_facet ${facet} mkdir -p ${MOUNT%/*}/${facet}
+    do_facet ${facet} "sysctl -w lnet.debug=$PTLDEBUG;
+        sysctl -w lnet.subsystem_debug=${SUBSYSTEM# };
+        sysctl -w lnet.debug_mb=${DEBUG_SIZE}"
     do_facet ${facet} mount -t lustre $@ ${device} ${MOUNT%/*}/${facet} 
     RC=${PIPESTATUS[0]}
     if [ $RC -ne 0 ]; then
@@ -396,7 +399,9 @@ zconf_mount() {
     do_node $client mkdir -p $mnt
     do_node $client mount -t lustre $OPTIONS $device $mnt || return 1
 
-    do_node $client "sysctl -w lnet.debug=$PTLDEBUG; sysctl -w lnet.subsystem_debug=${SUBSYSTEM# }"
+    do_node $client "sysctl -w lnet.debug=$PTLDEBUG;
+        sysctl -w lnet.subsystem_debug=${SUBSYSTEM# };
+        sysctl -w lnet.debug_mb=${DEBUG_SIZE}"
     [ -d /r ] && $LCTL modules > /r/tmp/ogdb-`hostname`
     return 0
 }