diff --git a/lustre/tests/cfg/insanity-local.sh b/lustre/tests/cfg/insanity-local.sh
index f728abf985c7b4d0c1327e91fa78a503af14fb0c..12f65afa9fbab7e48a53799e71c9afea2a689ce3 100644
--- a/lustre/tests/cfg/insanity-local.sh
+++ b/lustre/tests/cfg/insanity-local.sh
@@ -26,6 +26,7 @@ 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}
 
 L_GETGROUPS=${L_GETGROUPS:-`do_facet mds which l_getgroups || echo`}
diff --git a/lustre/tests/cfg/insanity-ltest.sh b/lustre/tests/cfg/insanity-ltest.sh
index 38ad7988f3866669037409bb6e641281339de7bd..fb776d6fbe9027c561d5c862b8aaa5e254a0d4b3 100644
--- a/lustre/tests/cfg/insanity-ltest.sh
+++ b/lustre/tests/cfg/insanity-ltest.sh
@@ -35,6 +35,7 @@ NETTYPE=${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 48c00a25bb0656534ef3d9a34dd49ae5c432d0b0..e1774c7810f500e571fb3b6786e992bb6c6da2a7 100644
--- a/lustre/tests/cfg/local.sh
+++ b/lustre/tests/cfg/local.sh
@@ -30,6 +30,7 @@ STRIPE_BYTES=${STRIPE_BYTES:-1048576}
 STRIPES_PER_OBJ=${STRIPES_PER_OBJ:-0}
 TIMEOUT=${TIMEOUT:-20}
 PTLDEBUG=${PTLDEBUG:-0x33f1504}
+DEBUG_SIZE=${DEBUG_SIZE:-10}
 SUBSYSTEM=${SUBSYSTEM:- 0xffb7e3ff}
 
 L_GETGROUPS=${L_GETGROUPS:-`do_facet mds which l_getgroups || echo`}
diff --git a/lustre/tests/cfg/lov.sh b/lustre/tests/cfg/lov.sh
index 7b0e427119313ef018cc45de207b4e6cfcdc5486..ddeb840b3512ef2d52cb55badda8da8d13a46fa3 100644
--- a/lustre/tests/cfg/lov.sh
+++ b/lustre/tests/cfg/lov.sh
@@ -24,6 +24,7 @@ STRIPE_BYTES=${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}
 
 L_GETGROUPS=${L_GETGROUPS:-`do_facet mds which l_getgroups || echo`}
diff --git a/lustre/tests/test-framework.sh b/lustre/tests/test-framework.sh
index 172016c6e8965075606c5cfd2ae5b4c1eea662fb..ea474f81db7ea2709d7e6af40194331a22472929 100644
--- a/lustre/tests/test-framework.sh
+++ b/lustre/tests/test-framework.sh
@@ -226,6 +226,9 @@ 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
@@ -280,7 +283,9 @@ 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
 }