Not-Handled-By : "Kok, Auke" <auke-jan.h.kok@intel.com>

On Saturday, 13 of September 2008, Christoph Lameter wrote:
> Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> > 
> > The following bug entry is on the current list of known regressions
> > from 2.6.26.  Please verify if it still should be listed and let me know
> > (either way).
> > 
> > 
> > Bug-Entry   : http://bugzilla.kernel.org/show_bug.cgi?id=11308
> > Subject             : tbench regression on each kernel release from 2.6.22
> -> 2.6.28
> > Submitter   : Christoph Lameter <cl@linux-foundation.org>
> > Date                : 2008-08-11 18:36 (33 days old)
> > References  : http://marc.info/?l=linux-kernel&m=121847986119495&w=4
> > 
> > 
> > 
> 
> tbench
> 
> 2.6.27-rc6    2760 MB/sec
> 2.6.22                3235.47 MB/sec
> 
> diff on the .config files for each (took .22 config and did a make oldconfig)
> 
> --- /boot/config-2.6.22.1-4U4JUMP1.12 2008-01-22 08:06:38.000000000 -0600
> +++ .config   2008-09-12 16:33:52.000000000 -0500
> @@ -1,55 +1,89 @@
>  #
>  # Automatically generated make config: don't edit
> -# Linux kernel version: 2.6.22.1-4U4JUMP1.12
> -# Mon Jan 21 16:05:52 2008
> +# Linux kernel version: 2.6.27-rc6
> +# Fri Sep 12 16:33:52 2008
>  #
> +# CONFIG_64BIT is not set
>  CONFIG_X86_32=y
> +# CONFIG_X86_64 is not set
> +CONFIG_X86=y
> +CONFIG_ARCH_DEFCONFIG="arch/x86/configs/i386_defconfig"
> +# CONFIG_GENERIC_LOCKBREAK is not set
>  CONFIG_GENERIC_TIME=y
> +CONFIG_GENERIC_CMOS_UPDATE=y
>  CONFIG_CLOCKSOURCE_WATCHDOG=y
>  CONFIG_GENERIC_CLOCKEVENTS=y
>  CONFIG_GENERIC_CLOCKEVENTS_BROADCAST=y
>  CONFIG_LOCKDEP_SUPPORT=y
>  CONFIG_STACKTRACE_SUPPORT=y
> -CONFIG_SEMAPHORE_SLEEPERS=y
> -CONFIG_X86=y
> +CONFIG_HAVE_LATENCYTOP_SUPPORT=y
> +CONFIG_FAST_CMPXCHG_LOCAL=y
>  CONFIG_MMU=y
>  CONFIG_ZONE_DMA=y
> -CONFIG_QUICKLIST=y
>  CONFIG_GENERIC_ISA_DMA=y
>  CONFIG_GENERIC_IOMAP=y
>  CONFIG_GENERIC_BUG=y
>  CONFIG_GENERIC_HWEIGHT=y
> +# CONFIG_GENERIC_GPIO is not set
>  CONFIG_ARCH_MAY_HAVE_PC_FDC=y
> -CONFIG_DMI=y
> +# CONFIG_RWSEM_GENERIC_SPINLOCK is not set
> +CONFIG_RWSEM_XCHGADD_ALGORITHM=y
> +# CONFIG_ARCH_HAS_ILOG2_U32 is not set
> +# CONFIG_ARCH_HAS_ILOG2_U64 is not set
> +CONFIG_ARCH_HAS_CPU_IDLE_WAIT=y
> +CONFIG_GENERIC_CALIBRATE_DELAY=y
> +# CONFIG_GENERIC_TIME_VSYSCALL is not set
> +CONFIG_ARCH_HAS_CPU_RELAX=y
> +CONFIG_ARCH_HAS_CACHE_LINE_SIZE=y
> +CONFIG_HAVE_SETUP_PER_CPU_AREA=y
> +# CONFIG_HAVE_CPUMASK_OF_CPU_MAP is not set
> +CONFIG_ARCH_HIBERNATION_POSSIBLE=y
> +CONFIG_ARCH_SUSPEND_POSSIBLE=y
> +# CONFIG_ZONE_DMA32 is not set
> +CONFIG_ARCH_POPULATES_NODE_MAP=y
> +# CONFIG_AUDIT_ARCH is not set
> +CONFIG_ARCH_SUPPORTS_AOUT=y
> +CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING=y
> +CONFIG_GENERIC_HARDIRQS=y
> +CONFIG_GENERIC_IRQ_PROBE=y
> +CONFIG_GENERIC_PENDING_IRQ=y
> +CONFIG_X86_SMP=y
> +CONFIG_X86_32_SMP=y
> +CONFIG_X86_HT=y
> +CONFIG_X86_BIOS_REBOOT=y
> +CONFIG_X86_TRAMPOLINE=y
> +CONFIG_KTIME_SCALAR=y
>  CONFIG_DEFCONFIG_LIST="/lib/modules/$UNAME_RELEASE/.config"
> 
>  #
> -# Code maturity level options
> +# General setup
>  #
>  CONFIG_EXPERIMENTAL=y
>  CONFIG_LOCK_KERNEL=y
>  CONFIG_INIT_ENV_ARG_LIMIT=32
> -
> -#
> -# General setup
> -#
>  CONFIG_LOCALVERSION=""
>  CONFIG_LOCALVERSION_AUTO=y
>  CONFIG_SWAP=y
>  CONFIG_SYSVIPC=y
> -# CONFIG_IPC_NS is not set
>  CONFIG_SYSVIPC_SYSCTL=y
>  CONFIG_POSIX_MQUEUE=y
>  # CONFIG_BSD_PROCESS_ACCT is not set
>  # CONFIG_TASKSTATS is not set
> -# CONFIG_UTS_NS is not set
>  # CONFIG_AUDIT is not set
>  CONFIG_IKCONFIG=y
>  CONFIG_IKCONFIG_PROC=y
>  CONFIG_LOG_BUF_SHIFT=18
> -# CONFIG_CPUSETS is not set
> +# CONFIG_CGROUPS is not set
> +CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y
> +# CONFIG_GROUP_SCHED is not set
>  CONFIG_SYSFS_DEPRECATED=y
> +CONFIG_SYSFS_DEPRECATED_V2=y
>  # CONFIG_RELAY is not set
> +CONFIG_NAMESPACES=y
> +# CONFIG_UTS_NS is not set
> +# CONFIG_IPC_NS is not set
> +# CONFIG_USER_NS is not set
> +# CONFIG_PID_NS is not set
>  CONFIG_BLK_DEV_INITRD=y
>  CONFIG_INITRAMFS_SOURCE=""
>  CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> @@ -64,6 +98,8 @@
>  CONFIG_PRINTK=y
>  CONFIG_BUG=y
>  CONFIG_ELF_CORE=y
> +CONFIG_PCSPKR_PLATFORM=y
> +CONFIG_COMPAT_BRK=y
>  CONFIG_BASE_FULL=y
>  CONFIG_FUTEX=y
>  CONFIG_ANON_INODES=y
> @@ -76,28 +112,40 @@
>  CONFIG_SLAB=y
>  # CONFIG_SLUB is not set
>  # CONFIG_SLOB is not set
> +CONFIG_PROFILING=y
> +# CONFIG_MARKERS is not set
> +CONFIG_OPROFILE=y
> +CONFIG_HAVE_OPROFILE=y
> +CONFIG_KPROBES=y
> +CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
> +CONFIG_KRETPROBES=y
> +CONFIG_HAVE_IOREMAP_PROT=y
> +CONFIG_HAVE_KPROBES=y
> +CONFIG_HAVE_KRETPROBES=y
> +# CONFIG_HAVE_ARCH_TRACEHOOK is not set
> +# CONFIG_HAVE_DMA_ATTRS is not set
> +CONFIG_USE_GENERIC_SMP_HELPERS=y
> +# CONFIG_HAVE_CLK is not set
> +CONFIG_PROC_PAGE_MONITOR=y
> +CONFIG_HAVE_GENERIC_DMA_COHERENT=y
> +CONFIG_SLABINFO=y
>  CONFIG_RT_MUTEXES=y
>  # CONFIG_TINY_SHMEM is not set
>  CONFIG_BASE_SMALL=0
> -
> -#
> -# Loadable module support
> -#
>  CONFIG_MODULES=y
> +# CONFIG_MODULE_FORCE_LOAD is not set
>  CONFIG_MODULE_UNLOAD=y
>  CONFIG_MODULE_FORCE_UNLOAD=y
>  # CONFIG_MODVERSIONS is not set
>  # CONFIG_MODULE_SRCVERSION_ALL is not set
> -# CONFIG_KMOD is not set
> +CONFIG_KMOD=y
>  CONFIG_STOP_MACHINE=y
> -
> -#
> -# Block layer
> -#
>  CONFIG_BLOCK=y
>  CONFIG_LBD=y
>  # CONFIG_BLK_DEV_IO_TRACE is not set
>  # CONFIG_LSF is not set
> +# CONFIG_BLK_DEV_BSG is not set
> +# CONFIG_BLK_DEV_INTEGRITY is not set
> 
>  #
>  # IO Schedulers
> @@ -111,6 +159,7 @@
>  # CONFIG_DEFAULT_CFQ is not set
>  # CONFIG_DEFAULT_NOOP is not set
>  CONFIG_DEFAULT_IOSCHED="anticipatory"
> +CONFIG_CLASSIC_RCU=y
> 
>  #
>  # Processor type and features
> @@ -118,17 +167,23 @@
>  CONFIG_TICK_ONESHOT=y
>  CONFIG_NO_HZ=y
>  CONFIG_HIGH_RES_TIMERS=y
> +CONFIG_GENERIC_CLOCKEVENTS_BUILD=y
>  CONFIG_SMP=y
> +CONFIG_X86_FIND_SMP_CONFIG=y
> +CONFIG_X86_MPPARSE=y
>  # CONFIG_X86_PC is not set
>  # CONFIG_X86_ELAN is not set
>  # CONFIG_X86_VOYAGER is not set
> +CONFIG_X86_GENERICARCH=y
>  # CONFIG_X86_NUMAQ is not set
>  # CONFIG_X86_SUMMIT is not set
> -# CONFIG_X86_BIGSMP is not set
> -# CONFIG_X86_VISWS is not set
> -CONFIG_X86_GENERICARCH=y
>  # CONFIG_X86_ES7000 is not set
> -# CONFIG_PARAVIRT is not set
> +# CONFIG_X86_BIGSMP is not set
> +# CONFIG_X86_VSMP is not set
> +# CONFIG_X86_RDC321X is not set
> +CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER=y
> +# CONFIG_PARAVIRT_GUEST is not set
> +# CONFIG_MEMTEST is not set
>  CONFIG_X86_CYCLONE_TIMER=y
>  # CONFIG_M386 is not set
>  # CONFIG_M486 is not set
> @@ -139,7 +194,6 @@
>  # CONFIG_MPENTIUMII is not set
>  # CONFIG_MPENTIUMIII is not set
>  # CONFIG_MPENTIUMM is not set
> -CONFIG_MCORE2=y
>  # CONFIG_MPENTIUM4 is not set
>  # CONFIG_MK6 is not set
>  # CONFIG_MK7 is not set
> @@ -154,33 +208,34 @@
>  # CONFIG_MCYRIXIII is not set
>  # CONFIG_MVIAC3_2 is not set
>  # CONFIG_MVIAC7 is not set
> +# CONFIG_MPSC is not set
> +CONFIG_MCORE2=y
> +# CONFIG_GENERIC_CPU is not set
>  CONFIG_X86_GENERIC=y
> +CONFIG_X86_CPU=y
>  CONFIG_X86_CMPXCHG=y

References: http://marc.info/?l=linux-kernel&m=122125737421332&w=4

Partially fixed by: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0c4b83da58ec2e96ce9c44c211d6eac5f9dae478

Should be fixed in 2.6.28-rc6 (multiple commits).