diff --git a/dump.c b/dump.c
index 51506ae..2fcc349 100644
--- a/dump.c
+++ b/dump.c
@@ -55,7 +55,7 @@ void emit(struct ovni_stream *stream, struct ovni_ev *ev)
 
 	printf("%d.%d.%d %c %c %c % 20lu % 15ld ",
 			stream->loom, stream->proc, stream->tid,
-			ev->model, ev->class, ev->value, clock, delta);
+			ev->header.model, ev->header.class, ev->header.value, clock, delta);
 
 	payloadsize = ovni_payload_size(ev);
 	for(i=0; i<payloadsize; i++)
@@ -97,7 +97,7 @@ void dump_events(struct ovni_trace *trace)
 			if(!stream->active)
 				continue;
 
-			ev = &stream->last;
+			ev = stream->cur_ev;
 			if(f < 0 || ovni_ev_get_clock(ev) < minclock)
 			{
 				f = i;
@@ -112,16 +112,16 @@ void dump_events(struct ovni_trace *trace)
 
 		stream = &trace->stream[f];
 
-		if(lastclock > ovni_ev_get_clock(&stream->last))
+		if(lastclock > ovni_ev_get_clock(stream->cur_ev))
 		{
 			fprintf(stdout, "warning: backwards jump in time %lu -> %lu\n",
-					lastclock, ovni_ev_get_clock(&stream->last));
+					lastclock, ovni_ev_get_clock(stream->cur_ev));
 		}
 
 		/* Emit current event */
-		emit(stream, &stream->last);
+		emit(stream, stream->cur_ev);
 
-		lastclock = ovni_ev_get_clock(&stream->last);
+		lastclock = ovni_ev_get_clock(stream->cur_ev);
 
 		/* Read the next one */
 		ovni_load_next_event(stream);
diff --git a/emu.c b/emu.c
index 73ea644..3fbc77a 100644
--- a/emu.c
+++ b/emu.c
@@ -29,7 +29,7 @@ emit_ev(struct ovni_stream *stream, struct ovni_ev *ev)
 
 	dbg("%d.%d.%d %c %c %c % 20lu % 15ld ",
 			stream->loom, stream->proc, stream->tid,
-			ev->model, ev->class, ev->value, clock, delta);
+			ev->header.model, ev->header.class, ev->header.value, clock, delta);
 
 	payloadsize = ovni_payload_size(ev);
 	for(i=0; i<payloadsize; i++)
@@ -47,27 +47,6 @@ emu_emit(struct ovni_emu *emu)
 	emit_ev(emu->cur_stream, emu->cur_ev);
 }
 
-static void
-load_first_event(struct ovni_stream *stream)
-{
-	int i;
-	size_t n;
-	struct ovni_ev *ev;
-
-	if(!stream->active)
-		return;
-
-	ev = &stream->last;
-	if((n = fread(ev, sizeof(*ev), 1, stream->f)) != 1)
-	{
-		//fprintf(stderr, "failed to read an event, n=%ld\n", n);
-		stream->active = 0;
-		return;
-	}
-
-	stream->active = 1;
-}
-
 struct ovni_ethread *
 find_thread(struct ovni_eproc *proc, pid_t tid)
 {
@@ -89,7 +68,7 @@ hook_pre(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
 
-	switch(emu->cur_ev->model)
+	switch(emu->cur_ev->header.model)
 	{
 		case 'O': hook_pre_ovni(emu); break;
 		case 'V': hook_pre_nosv(emu); break;
@@ -104,7 +83,7 @@ hook_view(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
 
-	switch(emu->cur_ev->model)
+	switch(emu->cur_ev->header.model)
 	{
 		case 'O': hook_view_ovni(emu); break;
 		case 'V': hook_view_nosv(emu); break;
@@ -119,7 +98,7 @@ hook_post(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
 
-	switch(emu->cur_ev->model)
+	switch(emu->cur_ev->header.model)
 	{
 		case 'O': hook_post_ovni(emu); break;
 		default:
@@ -132,7 +111,7 @@ static void
 set_current(struct ovni_emu *emu, struct ovni_stream *stream)
 {
 	emu->cur_stream = stream;
-	emu->cur_ev = &stream->last;
+	emu->cur_ev = stream->cur_ev;
 	emu->cur_loom = &emu->trace.loom[stream->loom];
 	emu->cur_proc = &emu->cur_loom->proc[stream->proc];
 	emu->cur_thread = &emu->cur_proc->thread[stream->thread];
@@ -163,7 +142,7 @@ next_event(struct ovni_emu *emu)
 		if(!stream->active)
 			continue;
 
-		ev = &stream->last;
+		ev = stream->cur_ev;
 		if(f < 0 || ovni_ev_get_clock(ev) < minclock)
 		{
 			f = i;
@@ -179,13 +158,13 @@ next_event(struct ovni_emu *emu)
 
 	set_current(emu, stream);
 
-	if(emu->lastclock > ovni_ev_get_clock(&stream->last))
+	if(emu->lastclock > ovni_ev_get_clock(stream->cur_ev))
 	{
 		fprintf(stdout, "warning: backwards jump in time %lu -> %lu\n",
-				emu->lastclock, ovni_ev_get_clock(&stream->last));
+				emu->lastclock, ovni_ev_get_clock(stream->cur_ev));
 	}
 
-	emu->lastclock = ovni_ev_get_clock(&stream->last);
+	emu->lastclock = ovni_ev_get_clock(stream->cur_ev);
 
 	if(t0 < 0)
 		t0 = emu->lastclock;
diff --git a/emu.h b/emu.h
index efee92c..777f87e 100644
--- a/emu.h
+++ b/emu.h
@@ -25,7 +25,6 @@ enum ethread_state {
 	TH_ST_DEAD,
 };
 
-
 enum nosv_task_state {
 	TASK_ST_CREATED,
 	TASK_ST_RUNNING,
@@ -45,17 +44,17 @@ struct nosv_task {
 
 struct nosv_task_type {
 	int id;
+	const char *label;
 	UT_hash_handle hh;
 };
 
-
 /* State of each emulated thread */
 struct ovni_ethread {
 	/* Emulated thread tid */
 	pid_t tid;
 
-	/* Stream file */
-	FILE *f;
+	/* Stream fd */
+	int stream_fd;
 
 	enum ethread_state state;
 
@@ -95,14 +94,17 @@ struct ovni_loom {
 };
 
 struct ovni_stream {
-	FILE *f;
+	uint8_t *buf;
+	size_t size;
+	size_t offset;
+
 	int tid;
 	int thread;
 	int proc;
 	int loom;
 	int loaded;
 	int active;
-	struct ovni_ev last;
+	struct ovni_ev *cur_ev;
 	uint64_t lastclock;
 };
 
@@ -142,7 +144,6 @@ struct ovni_cpu {
 	struct ovni_ethread *thread[OVNI_MAX_THR];
 };
 
-
 struct ovni_emu {
 	struct ovni_trace trace;
 
diff --git a/emu_nosv.c b/emu_nosv.c
index ffb7ef8..1b63609 100644
--- a/emu_nosv.c
+++ b/emu_nosv.c
@@ -148,7 +148,7 @@ static void
 pre_task(struct ovni_emu *emu)
 {
 	emu_emit(emu);
-	switch(emu->cur_ev->value)
+	switch(emu->cur_ev->header.value)
 	{
 		case 'c': pre_task_create(emu); break;
 		case 'x': pre_task_execute(emu); break;
@@ -165,16 +165,27 @@ static void
 pre_type_create(struct ovni_emu *emu)
 {
 	struct nosv_task_type *type, *p = NULL;
-	int typeid;
+	uint8_t *data;
+	uint32_t *typeid;
+	const char *label;
 
-	typeid = emu->cur_ev->payload.i32[0];
+	if((emu->cur_ev->header.flags & OVNI_EV_JUMBO) == 0)
+	{
+		err("expecting a jumbo event\n");
+		abort();
+	}
+
+	data = &emu->cur_ev->payload.jumbo.data[0];
+	typeid = (uint32_t *) data;
+	data += sizeof(*typeid);
+	label = (const char *) data;
 
 	/* Ensure the type id is new */
-	HASH_FIND_INT(types, &typeid, type);
+	HASH_FIND_INT(types, typeid, type);
 
 	if(type != NULL)
 	{
-		err("A task type with id %d already exists\n", p->id);
+		err("A task type with id %d already exists\n", *typeid);
 		abort();
 	}
 	
@@ -186,18 +197,20 @@ pre_type_create(struct ovni_emu *emu)
 		abort();
 	}
 
-	type->id = typeid;
+	type->id = *typeid;
+	type->label = label;
 
 	/* Add the new task type to the hash table */
 	HASH_ADD_INT(types, id, type);
 
-	dbg("new task type created id=%d\n", type->id);
+	dbg("new task type created id=%d label=%s\n", type->id,
+			type->label);
 }
 
 static void
 pre_type(struct ovni_emu *emu)
 {
-	switch(emu->cur_ev->value)
+	switch(emu->cur_ev->header.value)
 	{
 		case 'c': pre_type_create(emu); break;
 		default:
@@ -209,7 +222,7 @@ void
 hook_pre_nosv(struct ovni_emu *emu)
 {
 	dbg("pre nosv\n");
-	switch(emu->cur_ev->class)
+	switch(emu->cur_ev->header.class)
 	{
 		case 'T': pre_task(emu); break;
 		case 'Y': pre_type(emu); break;
@@ -266,7 +279,7 @@ emit_task_end(struct ovni_emu *emu)
 static void
 emit_task(struct ovni_emu *emu)
 {
-	switch(emu->cur_ev->value)
+	switch(emu->cur_ev->header.value)
 	{
 		case 'c': emit_task_create(emu); break;
 		case 'x': emit_task_execute(emu); break;
@@ -282,7 +295,7 @@ void
 hook_view_nosv(struct ovni_emu *emu)
 {
 	dbg("pre nosv\n");
-	switch(emu->cur_ev->class)
+	switch(emu->cur_ev->header.class)
 	{
 		case 'T': emit_task(emu); break;
 		default:
diff --git a/emu_ovni.c b/emu_ovni.c
index 222da97..5d88d7f 100644
--- a/emu_ovni.c
+++ b/emu_ovni.c
@@ -158,7 +158,7 @@ ev_thread(struct ovni_emu *emu)
 	cpu = thread->cpu;
 	ev = emu->cur_ev;
 
-	switch(ev->value)
+	switch(ev->header.value)
 	{
 		case 'c': /* create */
 			dbg("thread %d creates a new thread at cpu=%d with args=%x %x\n",
@@ -231,13 +231,13 @@ static void
 ev_affinity(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
-	switch(emu->cur_ev->value)
+	switch(emu->cur_ev->header.value)
 	{
 		case 's': ev_affinity_set(emu); break;
 		case 'r': ev_affinity_remote(emu); break;
 		default:
 			dbg("unknown affinity event value %c\n",
-					emu->cur_ev->value);
+					emu->cur_ev->header.value);
 			break;
 	}
 }
@@ -294,13 +294,13 @@ ev_cpu_id(struct ovni_emu *emu)
 static void
 ev_cpu(struct ovni_emu *emu)
 {
-	switch(emu->cur_ev->value)
+	switch(emu->cur_ev->header.value)
 	{
 		case 'n': ev_cpu_count(emu); break;
 		case 'i': ev_cpu_id(emu); break;
 		default:
 			dbg("unknown cpu event value %c\n",
-					emu->cur_ev->value);
+					emu->cur_ev->header.value);
 			break;
 	}
 }
@@ -310,15 +310,15 @@ hook_pre_ovni(struct ovni_emu *emu)
 {
 	//emu_emit(emu);
 
-	switch(emu->cur_ev->class)
+	switch(emu->cur_ev->header.class)
 	{
 		case 'H': ev_thread(emu); break;
 		case 'A': ev_affinity(emu); break;
 		case 'C': ev_cpu(emu); break;
-		case 'B': dbg("burst %c\n", emu->cur_ev->value); break;
+		case 'B': dbg("burst %c\n", emu->cur_ev->header.value); break;
 		default:
 			dbg("unknown ovni event class %c\n",
-					emu->cur_ev->class);
+					emu->cur_ev->header.class);
 			break;
 	}
 
@@ -367,7 +367,7 @@ emit:
 void
 hook_view_ovni(struct ovni_emu *emu)
 {
-	switch(emu->cur_ev->class)
+	switch(emu->cur_ev->header.class)
 	{
 		case 'H':
 		case 'A':
diff --git a/ovni.c b/ovni.c
index eda549e..4aff761 100644
--- a/ovni.c
+++ b/ovni.c
@@ -9,6 +9,7 @@
 #include <linux/limits.h>
 #include <errno.h>
 #include <sys/stat.h>
+#include <sys/mman.h>
 #include <stdatomic.h>
 #include <assert.h>
 #include <unistd.h>
@@ -284,8 +285,8 @@ flush_evbuf()
 static void
 ovni_ev_set_clock(struct ovni_ev *ev)
 {
-	ev->clock_lo = (uint32_t) (rthread.clockvalue & 0xffffffff);
-	ev->clock_hi = (uint16_t) ((rthread.clockvalue >> 32) & 0xffff);
+	ev->header.clock_lo = (uint32_t) (rthread.clockvalue & 0xffffffff);
+	ev->header.clock_hi = (uint16_t) ((rthread.clockvalue >> 32) & 0xffff);
 }
 
 uint64_t
@@ -293,16 +294,22 @@ ovni_ev_get_clock(struct ovni_ev *ev)
 {
 	uint64_t clock;
 
-	clock = ((uint64_t) ev->clock_hi) << 32 | ((uint64_t) ev->clock_lo);
+	clock = ((uint64_t) ev->header.clock_hi) << 32 | ((uint64_t) ev->header.clock_lo);
 	return clock;
 }
 
 void
 ovni_ev_set_mcv(struct ovni_ev *ev, char *mcv)
 {
-	ev->model = mcv[0];
-	ev->class = mcv[1];
-	ev->value = mcv[2];
+	ev->header.model = mcv[0];
+	ev->header.class = mcv[1];
+	ev->header.value = mcv[2];
+}
+
+static size_t
+get_jumbo_payload_size(struct ovni_ev *ev)
+{
+	return sizeof(ev->payload.jumbo.size) + ev->payload.jumbo.size;
 }
 
 int
@@ -310,7 +317,10 @@ ovni_payload_size(struct ovni_ev *ev)
 {
 	int size;
 
-	size = ev->flags & 0x0f;
+	if(ev->header.flags & OVNI_EV_JUMBO)
+		return get_jumbo_payload_size(ev);
+
+	size = ev->header.flags & 0x0f;
 
 	if(size == 0)
 		return 0;
@@ -327,6 +337,9 @@ ovni_payload_add(struct ovni_ev *ev, uint8_t *buf, int size)
 {
 	int payload_size;
 
+	assert((ev->header.flags & OVNI_EV_JUMBO) == 0);
+	assert(size >= 2);
+
 	payload_size = ovni_payload_size(ev);
 
 	/* Ensure we have room */
@@ -335,37 +348,17 @@ ovni_payload_add(struct ovni_ev *ev, uint8_t *buf, int size)
 	memcpy(&ev->payload.u8[payload_size], buf, size);
 	payload_size += size;
 
-	ev->flags = ev->flags & 0xf0 | (payload_size-1) & 0x0f;
+	ev->header.flags = ev->header.flags & 0xf0 | (payload_size-1) & 0x0f;
 }
 
 int
 ovni_ev_size(struct ovni_ev *ev)
 {
-	return sizeof(*ev) - sizeof(ev->payload) +
-		ovni_payload_size(ev);
+	return sizeof(ev->header) + ovni_payload_size(ev);
 }
 
-
 static void
-ovni_ev_add(struct ovni_ev *ev)
-{
-	int size;	
-
-	ovni_ev_set_clock(ev);
-	
-	size = ovni_ev_size(ev);
-
-
-	memcpy(&rthread.evbuf[rthread.evlen], ev, size);
-	rthread.evlen += size;
-}
-
-void
-ovni_ev(struct ovni_ev *ev)
-{
-	ovni_ev_set_clock(ev);
-	ovni_ev_add(ev);
-}
+ovni_ev_add(struct ovni_ev *ev);
 
 int
 ovni_flush()
@@ -393,6 +386,79 @@ ovni_flush()
 	return ret;
 }
 
+void
+ovni_ev_add_jumbo(struct ovni_ev *ev, uint8_t *buf, uint32_t bufsize)
+{
+	size_t evsize, totalsize;
+
+	assert(ovni_payload_size(ev) == 0);
+
+	ovni_payload_add(ev, (uint8_t *) &bufsize, sizeof(bufsize));
+	evsize = ovni_ev_size(ev);
+
+	totalsize = evsize + bufsize;
+
+	/* Check if the event fits or flush first otherwise */
+	if(rthread.evlen + totalsize >= OVNI_MAX_EV_BUF)
+		ovni_flush();
+
+	/* Se the jumbo flag here, so we capture the previous evsize
+	 * properly, ignoring the jumbo buffer */
+	ev->header.flags |= OVNI_EV_JUMBO;
+
+	memcpy(&rthread.evbuf[rthread.evlen], ev, evsize);
+	rthread.evlen += evsize;
+	memcpy(&rthread.evbuf[rthread.evlen], buf, bufsize);
+	rthread.evlen += bufsize;
+
+	assert(rthread.evlen < OVNI_MAX_EV_BUF);
+}
+
+
+static void
+ovni_ev_add(struct ovni_ev *ev)
+{
+	int size;	
+
+	size = ovni_ev_size(ev);
+
+	/* Check if the event fits or flush first otherwise */
+	if(rthread.evlen + size >= OVNI_MAX_EV_BUF)
+		ovni_flush();
+
+	memcpy(&rthread.evbuf[rthread.evlen], ev, size);
+	rthread.evlen += size;
+}
+
+void
+ovni_ev_jumbo(struct ovni_ev *ev, uint8_t *buf, uint32_t bufsize)
+{
+	ovni_ev_set_clock(ev);
+	ovni_ev_add_jumbo(ev, buf, bufsize);
+}
+
+void
+ovni_ev(struct ovni_ev *ev)
+{
+	ovni_ev_set_clock(ev);
+	ovni_ev_add(ev);
+}
+
+static int
+load_thread(struct ovni_ethread *thread, int tid, char *filepath)
+{
+	thread->tid = tid;
+	thread->stream_fd = open(filepath, O_RDONLY);
+
+	if(thread->stream_fd == -1)
+	{
+		perror("open");
+		return -1;
+	}
+
+	thread->state = TH_ST_UNKNOWN;
+	return 0;
+}
 
 static int
 load_proc(struct ovni_eproc *proc, char *procdir)
@@ -425,20 +491,12 @@ load_proc(struct ovni_eproc *proc, char *procdir)
 			return -1;
 		}
 
+		sprintf(path, "%s/%s", procdir, dirent->d_name);
 
 		thread = &proc->thread[proc->nthreads++];
-		thread->tid = atoi(p);
 
-		sprintf(path, "%s/%s", procdir, dirent->d_name);
-		thread->f = fopen(path, "r");
-		thread->state = TH_ST_UNKNOWN;
-
-		if(thread->f == NULL)
-		{
-			fprintf(stderr, "fopen %s failed: %s\n",
-					path, strerror(errno));
+		if(load_thread(thread, atoi(p), path) != 0)
 			return -1;
-		}
 	}
 
 	closedir(dir);
@@ -503,6 +561,30 @@ ovni_load_trace(struct ovni_trace *trace, char *tracedir)
 	return 0;
 }
 
+static int
+load_stream_buf(struct ovni_stream *stream, struct ovni_ethread *thread)
+{
+	struct stat st;
+
+	if(fstat(thread->stream_fd, &st) < 0)
+	{
+		perror("fstat");
+		return -1;
+	}
+
+	stream->size = st.st_size;
+	stream->buf = mmap(NULL, stream->size, PROT_READ, MAP_SHARED,
+			thread->stream_fd, 0);
+
+	if(stream->buf == MAP_FAILED)
+	{
+		perror("mmap");
+		return -1;
+	}
+
+	return 0;
+}
+
 /* Populates the streams in a single array */
 int
 ovni_load_streams(struct ovni_trace *trace)
@@ -549,13 +631,20 @@ ovni_load_streams(struct ovni_trace *trace)
 				thread = &proc->thread[k];
 				stream = &trace->stream[s++];
 
-				stream->f = thread->f;
+				if(load_stream_buf(stream, thread) != 0)
+				{
+					err("load_stream_buf failed\n");
+					return -1;
+				}
+
 				stream->tid = thread->tid;
 				stream->thread = k;
 				stream->proc = j;
 				stream->loom = i;
 				stream->active = 1;
 				stream->lastclock = 0;
+				stream->offset = 0;
+				stream->cur_ev = NULL;
 			}
 		}
 	}
@@ -569,45 +658,51 @@ ovni_free_streams(struct ovni_trace *trace)
 	free(trace->stream);
 }
 
-void
+int
 ovni_load_next_event(struct ovni_stream *stream)
 {
 	int i;
 	size_t n, size;
-	struct ovni_ev *ev;
 	uint8_t flags;
 
-	if(!stream->active)
-		return;
-
-	ev = &stream->last;
-	if((n = fread(&ev->flags, sizeof(ev->flags), 1, stream->f)) != 1)
+	if(stream->active == 0)
 	{
-		dbg("stream is empty\n");
-		stream->active = 0;
-		return;
+		dbg("stream is inactive, cannot load more events\n");
+		return -1;
 	}
 
-	//dbg("flags = %d\n", ev->flags);
-
-	size = ovni_ev_size(ev) - sizeof(ev->flags);
-	//dbg("ev size = %d\n", size);
-
-
-	/* Clean payload from previous event */
-	memset(&ev->payload, 0, sizeof(ev->payload));
-
-	if((n = fread(((uint8_t *) ev) + sizeof(ev->flags), 1, size, stream->f)) != size)
+	if(stream->cur_ev == NULL)
 	{
-		err("warning: garbage found at the end of the stream\n");
-		stream->active = 0;
-		return;
+		stream->cur_ev = (struct ovni_ev *) stream->buf;
+		stream->offset = 0;
+		dbg("first event\n");
+		goto out;
 	}
 
+	//printf("advancing offset %ld bytes\n", ovni_ev_size(stream->cur_ev));
+	stream->offset += ovni_ev_size(stream->cur_ev);
+
+	/* We have reached the end */
+	if(stream->offset == stream->size)
+	{
+		stream->active = 0;
+		dbg("stream runs out of events\n");
+		return -1;
+	}
+
+	/* It cannot overflow, otherwise we are reading garbage */
+	assert(stream->offset < stream->size);
+
+	stream->cur_ev = (struct ovni_ev *) &stream->buf[stream->offset];
+
+out:
+
+	//dbg("---------\n");
+	//dbg("ev size = %d\n", ovni_ev_size(stream->cur_ev));
+	//dbg("ev flags = %02x\n", stream->cur_ev->header.flags);
 	//dbg("loaded next event:\n");
-	//hexdump((uint8_t *) ev, ovni_ev_size(ev));
+	//hexdump((uint8_t *) stream->cur_ev, ovni_ev_size(stream->cur_ev));
 	//dbg("---------\n");
 
-	stream->active = 1;
-
+	return 0;
 }
diff --git a/ovni.h b/ovni.h
index 9318bbb..71452fc 100644
--- a/ovni.h
+++ b/ovni.h
@@ -18,25 +18,46 @@
 
 /* ----------------------- common ------------------------ */
 
-union __attribute__((__packed__)) ovni_ev_payload {
-	uint8_t u8[16];
-	int8_t i8[16];
-	uint16_t u16[8];
-	int16_t i16[8];
-	uint32_t u32[4];
-	int32_t i32[4];
-	uint64_t u64[2];
-	int64_t i64[2];
+enum ovni_ev_flags {
+	OVNI_EV_JUMBO = 0x10,
 };
 
-struct __attribute__((__packed__)) ovni_ev {
+struct __attribute__((__packed__)) ovni_jumbo_payload {
+	uint32_t size;
+	uint8_t data[1];
+};
+
+union __attribute__((__packed__)) ovni_ev_payload {
+
+	int8_t i8[16];
+	int16_t i16[8];
+	int32_t i32[4];
+	int64_t i64[2];
+
+	uint8_t u8[16];
+	uint16_t u16[8];
+	uint32_t u32[4];
+	uint64_t u64[2];
+
+	struct ovni_jumbo_payload jumbo;
+};
+
+struct __attribute__((__packed__)) ovni_ev_header {
 	/* first 4 bits reserved, last 4 for payload size */
 	uint8_t flags;
 	uint8_t model;
 	uint8_t class;
 	uint8_t value;
-	uint16_t clock_hi;
 	uint32_t clock_lo;
+	uint16_t clock_hi;
+};
+
+struct __attribute__((__packed__)) ovni_ev {
+	struct ovni_ev_header header;
+
+	/* The payload size may vary depending on the ev type:
+	 *   - normal: 0, or 2 to 16 bytes
+	 *   - jumbo: 0 to 2^32 - 1 bytes */
 	union ovni_ev_payload payload;
 };
 
@@ -100,6 +121,7 @@ int ovni_payload_size(struct ovni_ev *ev);
 
 /* Set the current clock in the event and queue it */
 void ovni_ev(struct ovni_ev *ev);
+void ovni_ev_jumbo(struct ovni_ev *ev, uint8_t *buf, uint32_t bufsize);
 
 int ovni_flush();
 
diff --git a/ovni2prv.c b/ovni2prv.c
index ed89246..d589bcb 100644
--- a/ovni2prv.c
+++ b/ovni2prv.c
@@ -31,7 +31,7 @@ void emit(struct ovni_stream *stream, struct ovni_ev *ev)
 	//2:0:1:1:7:1542091:6400025:1
 	//2:0:1:1:7:1542091:6400017:0
 
-	printf("2:0:1:1:%d:%ld:%d:%d\n", stream->thread+1, delta, ev->class, ev->value);
+	printf("2:0:1:1:%d:%ld:%d:%d\n", stream->thread+1, delta, ev->header.class, ev->header.value);
 }
 
 void dump_events(struct ovni_trace *trace)
@@ -63,7 +63,7 @@ void dump_events(struct ovni_trace *trace)
 			if(!stream->active)
 				continue;
 
-			ev = &stream->last;
+			ev = stream->cur_ev;
 			if(f < 0 || ovni_ev_get_clock(ev) < minclock)
 			{
 				f = i;
@@ -78,15 +78,15 @@ void dump_events(struct ovni_trace *trace)
 
 		stream = &trace->stream[f];
 
-		if(lastclock >= ovni_ev_get_clock(&stream->last))
+		if(lastclock >= ovni_ev_get_clock(stream->cur_ev))
 		{
 			fprintf(stderr, "warning: backwards jump in time\n");
 		}
 
 		/* Emit current event */
-		emit(stream, &stream->last);
+		emit(stream, stream->cur_ev);
 
-		lastclock = ovni_ev_get_clock(&stream->last);
+		lastclock = ovni_ev_get_clock(stream->cur_ev);
 
 		/* Read the next one */
 		ovni_load_next_event(stream);
diff --git a/ovni_trace.h b/ovni_trace.h
index 59990b9..9606d84 100644
--- a/ovni_trace.h
+++ b/ovni_trace.h
@@ -4,7 +4,7 @@
 #include "ovni.h"
 #include "emu.h"
 
-void ovni_load_next_event(struct ovni_stream *stream);
+int ovni_load_next_event(struct ovni_stream *stream);
 
 int ovni_load_trace(struct ovni_trace *trace, char *tracedir);