--- loadgen.c.orig	2009-02-13 12:21:48.000000000 +0200
+++ loadgen.c	2009-12-01 11:52:10.000000000 +0200
@@ -731,6 +731,19 @@ out:
         pthread_exit((void *)(long)rc);
 }
 
+/* 
+ * PTHREAD_STACK_MIN is 16K minimal stack for threads. This
+ * is stack consumed by one thread, which executes NULL procedure.
+ * We need some more here and 20k stack for one client thread
+ * is enough to not overflow. In same time it does not consume
+ * a lot of memory for large number of threads.
+ *
+ * 20K virtual clients will only consume 320M + 400M. Still to
+ * create this number of virtual clients we need to fix 8192
+ * OBDs limit.
+ */
+#define CLIENT_THREAD_STACK_SIZE (PTHREAD_STACK_MIN + (20 * 1024))
+
 static int loadgen_start_clients(int argc, char **argv)
 {
         int rc = 0, i, numt;
@@ -756,7 +769,7 @@ static int loadgen_start_clients(int arg
                         cmdname, rc, strerror(errno));
                 return -errno;
         }
-        pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN);
+        pthread_attr_setstacksize (&attr, CLIENT_THREAD_STACK_SIZE);
         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
 
         numt += live_threads;