diff --git a/hermit/arch/x86/include/asm/tasks_types.h b/hermit/arch/x86/include/asm/tasks_types.h
index 555c740b2..7287e1eeb 100644
--- a/hermit/arch/x86/include/asm/tasks_types.h
+++ b/hermit/arch/x86/include/asm/tasks_types.h
@@ -82,10 +82,14 @@ typedef struct {
 	uint64_t reserved[6];
 } xsave_header_t;
 
+typedef struct {
+	uint32_t ymmh_space[64];
+} ymmh_t;
+
 typedef struct {
 	i387_fxsave_t fxsave;
 	xsave_header_t hdr;
-	uint32_t ymmh[64];
+	ymmh_t ymmh;
 } xsave_t __attribute__ ((aligned (64)));
 
 union fpu_state {
diff --git a/hermit/arch/x86/kernel/entry.asm b/hermit/arch/x86/kernel/entry.asm
index 4fd1fe550..e0c1e3d3f 100644
--- a/hermit/arch/x86/kernel/entry.asm
+++ b/hermit/arch/x86/kernel/entry.asm
@@ -407,7 +407,7 @@ gdt_flush:
 ; NASM macro which pushs also an pseudo error code
 %macro isrstub_pseudo_error 1
     global isr%1
-    align 8
+    align 16
     isr%1:
         push byte 0 ; pseudo error code
         push byte %1
@@ -419,7 +419,7 @@ gdt_flush:
 ; on the stack.
 %macro isrstub 1
     global isr%1
-    align 8
+    align 16
     isr%1:
         push byte %1
         jmp common_stub
@@ -472,7 +472,7 @@ isrstub_pseudo_error 9
 ; NASM macro for asynchronous interrupts (no exceptions)
 %macro irqstub 1
     global irq%1
-    align 8
+    align 16
     irq%1:
         push byte 0 ; pseudo error code
         push byte 32+%1
@@ -487,35 +487,35 @@ isrstub_pseudo_error 9
 %endrep
 
 global apic_timer
-align 8
+align 16
 apic_timer:
     push byte 0 ; pseudo error code
     push byte 123
     jmp common_stub
 
 global apic_lint0
-align 8
+align 16
 apic_lint0:
     push byte 0 ; pseudo error code
     push byte 124
     jmp common_stub
 
 global apic_lint1
-align 8
+align 16
 apic_lint1:
     push byte 0 ; pseudo error code
     push byte 125
     jmp common_stub
 
 global apic_error
-align 8
+align 16
 apic_error:
     push byte 0 ; pseudo error code
     push byte 126
     jmp common_stub
 
 global apic_svr
-align 8
+align 16
 apic_svr:
     push byte 0 ; pseudo error code
     push byte 127
@@ -528,7 +528,7 @@ extern syscall_handler
 extern kernel_stack
 
 global isrsyscall
-align 8
+align 16
 ; used to realize system calls
 isrsyscall:
     ; IF flag is already cleared 
@@ -586,7 +586,7 @@ isrsyscall:
     o64 sysret
 
 global switch_context
-align 8
+align 16
 switch_context:
     ; create on the stack a pseudo interrupt
     ; afterwards, we switch to the task with iret
@@ -618,11 +618,11 @@ switch_context:
 
     jmp common_switch
 
-align 8
+align 16
 rollback:
     ret
 
-align 8
+align 16
 common_stub:
     ; do we interrupt user-level code?
     cmp QWORD [rsp+24], 0x08
@@ -695,7 +695,7 @@ kernel_space2:
 SECTION .data
 
 global mb_info:
-align 8
+align 16
 mb_info:
     DQ 0
 
diff --git a/hermit/arch/x86/kernel/processor.c b/hermit/arch/x86/kernel/processor.c
index 24c0a666f..838492e07 100644
--- a/hermit/arch/x86/kernel/processor.c
+++ b/hermit/arch/x86/kernel/processor.c
@@ -114,11 +114,11 @@ static void restore_fpu_state_xsave(union fpu_state* state)
 
 static void fpu_init_xsave(union fpu_state* fpu)
 {
-	i387_fsave_t* fp = &fpu->fsave;
 	xsave_t* xs = &fpu->xsave;
 
 	memset(xs, 0x00, sizeof(xsave_t));
-	fp->twd = 0xffffu;
+	//xs->fxsave.twd = 0xffffu;
+	xs->fxsave.mxcsr = 0x1f80;
 }
 
 uint32_t detect_cpu_frequency(void)
diff --git a/hermit/arch/x86/kernel/tasks.c b/hermit/arch/x86/kernel/tasks.c
index 8fdcc4e2b..43d0137ca 100644
--- a/hermit/arch/x86/kernel/tasks.c
+++ b/hermit/arch/x86/kernel/tasks.c
@@ -38,7 +38,7 @@
 #include <asm/page.h>
 #include <asm/tss.h>
 
-extern tss_t	task_state_segments[MAX_CORES] __attribute__ ((aligned (PAGE_SIZE)));
+extern tss_t	task_state_segments[MAX_CORES];
 
 size_t* get_current_stack(void)
 {
diff --git a/hermit/newlib/Makefile b/hermit/newlib/Makefile
index 75f12e32e..be3b2a85f 100644
--- a/hermit/newlib/Makefile
+++ b/hermit/newlib/Makefile
@@ -17,8 +17,8 @@ ifeq ($V,0)
 endif
 
 default: $(ARCH)
-	$Q$(MAKE) ARCH=$(ARCH) TARGET=$(TARGET) CFLAGS+="-ffreestanding -O3 -Wall -I$(NEWLIB)/include -I../../include -I../../arch/$(ARCH)/include" LDFLAGS+="-nostdlib -L$(NEWLIB)/lib" -C examples depend
-	$Q$(MAKE) ARCH=$(ARCH) TARGET=$(TARGET) CFLAGS+="-ffreestanding -O3 -Wall -I$(NEWLIB)/include -I../../include -I../../arch/$(ARCH)/include" LDFLAGS+="-nostdlib -L$(NEWLIB)/lib" -C examples
+	$Q$(MAKE) ARCH=$(ARCH) TARGET=$(TARGET) CFLAGS+="-DSTREAM_ARRAY_SIZE=100000 -ffreestanding -O3 -Wall -I$(NEWLIB)/include -I../../include -I../../arch/$(ARCH)/include" LDFLAGS+="-nostdlib -L$(NEWLIB)/lib" -C examples depend
+	$Q$(MAKE) ARCH=$(ARCH) TARGET=$(TARGET) CFLAGS+="-DSTREAM_ARRAY_SIZE=100000 -ffreestanding -O3 -Wall -I$(NEWLIB)/include -I../../include -I../../arch/$(ARCH)/include" LDFLAGS+="-nostdlib -L$(NEWLIB)/lib" -C examples
 
 $(ARCH):
 	@echo Build newlib
diff --git a/hermit/newlib/examples/jacobi.c b/hermit/newlib/examples/jacobi.c
index 9b57e95e3..335978fa6 100644
--- a/hermit/newlib/examples/jacobi.c
+++ b/hermit/newlib/examples/jacobi.c
@@ -34,7 +34,7 @@
 #include <errno.h>
 
 #define MATRIX_SIZE 	128
-#define MAXVALUE	1337
+#define MAXVALUE	17
 #define PAGE_SIZE	4096
 #define CACHE_SIZE	(256*1024)
 #define ALIGN(x,a)	(((x)+(a)-1)&~((a)-1))