From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263054AbUB0REI (ORCPT ); Fri, 27 Feb 2004 12:04:08 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263053AbUB0REH (ORCPT ); Fri, 27 Feb 2004 12:04:07 -0500 Received: from ms002msg.fastwebnet.it ([213.140.2.52]:38640 "EHLO ms002msg.fastwebnet.it") by vger.kernel.org with ESMTP id S263054AbUB0RCf (ORCPT ); Fri, 27 Feb 2004 12:02:35 -0500 From: Paolo Ornati To: linux-kernel@vger.kernel.org Subject: 2.6.x: iowait problem while burning a CD Date: Fri, 27 Feb 2004 18:02:51 +0100 User-Agent: KMail/1.5.4 MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Message-Id: <200402271802.51604.ornati@fastwebnet.it> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi, [hoping that my English is comprehensible...] trying to burn a CD "on the fly" I have noticed a strange thing. During the burning "iowait" remains enough low (~3%, MAX 10%) but, after a little time, it suddenly and quickly goes up to 80-90%: in this condition MKFS seems unable to fill the FIFO buffer as quickly as the CD-writer writes --> so the amount of data in the buffer is in "free fall" and sometime the buffer becomes empty (in this case I must thank the BurnFree technology ;) After this peak IOWAIT returns on reasonable values, the buffer is filled up and all work fine until IOWAIT goes up newly. KERNEL: 2.6.3 (but I see this also on 2.6.0.... so I think it affects all 2.6.x kernels) Cdrecord 2.00.3 K3B 0.11.5 MINIMAL-CONFIG is appended (I have tried to disable CONFIG_PREEMPT and this seems to reduce the problem, but doesn't eliminate it) Any ideas? # # Automatically generated make config: don't edit # CONFIG_X86=y CONFIG_MMU=y CONFIG_UID16=y CONFIG_GENERIC_ISA_DMA=y # # Code maturity level options # # CONFIG_EXPERIMENTAL is not set CONFIG_CLEAN_COMPILE=y CONFIG_STANDALONE=y CONFIG_BROKEN_ON_SMP=y # # General setup # CONFIG_SWAP=y CONFIG_SYSVIPC=y # CONFIG_BSD_PROCESS_ACCT is not set CONFIG_SYSCTL=y CONFIG_LOG_BUF_SHIFT=14 # CONFIG_IKCONFIG is not set # CONFIG_EMBEDDED is not set CONFIG_KALLSYMS=y CONFIG_FUTEX=y CONFIG_EPOLL=y CONFIG_IOSCHED_NOOP=y CONFIG_IOSCHED_AS=y CONFIG_IOSCHED_DEADLINE=y # CONFIG_CC_OPTIMIZE_FOR_SIZE is not set # # Loadable module support # # CONFIG_MODULES is not set # # Processor type and features # CONFIG_X86_PC=y # CONFIG_X86_VOYAGER is not set # 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 is not set # CONFIG_X86_ES7000 is not set # CONFIG_M386 is not set # CONFIG_M486 is not set # CONFIG_M586 is not set # CONFIG_M586TSC is not set # CONFIG_M586MMX is not set # CONFIG_M686 is not set # CONFIG_MPENTIUMII is not set # CONFIG_MPENTIUMIII is not set # CONFIG_MPENTIUM4 is not set # CONFIG_MK6 is not set CONFIG_MK7=y # CONFIG_MK8 is not set # CONFIG_MELAN is not set # CONFIG_MCRUSOE is not set # CONFIG_MWINCHIPC6 is not set # CONFIG_MWINCHIP2 is not set # CONFIG_MWINCHIP3D is not set # CONFIG_MCYRIXIII is not set # CONFIG_MVIAC3_2 is not set # CONFIG_X86_GENERIC is not set CONFIG_X86_CMPXCHG=y CONFIG_X86_XADD=y CONFIG_X86_L1_CACHE_SHIFT=6 CONFIG_RWSEM_XCHGADD_ALGORITHM=y CONFIG_X86_WP_WORKS_OK=y CONFIG_X86_INVLPG=y CONFIG_X86_BSWAP=y CONFIG_X86_POPAD_OK=y CONFIG_X86_GOOD_APIC=y CONFIG_X86_INTEL_USERCOPY=y CONFIG_X86_USE_PPRO_CHECKSUM=y CONFIG_X86_USE_3DNOW=y # CONFIG_HPET_TIMER is not set # CONFIG_HPET_EMULATE_RTC is not set # CONFIG_SMP is not set CONFIG_PREEMPT=y # CONFIG_X86_UP_APIC is not set CONFIG_X86_TSC=y # CONFIG_X86_MCE is not set # CONFIG_TOSHIBA is not set # CONFIG_I8K is not set # CONFIG_MICROCODE is not set CONFIG_X86_MSR=y CONFIG_X86_CPUID=y CONFIG_NOHIGHMEM=y # CONFIG_HIGHMEM4G is not set # CONFIG_HIGHMEM64G is not set # CONFIG_MATH_EMULATION is not set CONFIG_MTRR=y CONFIG_HAVE_DEC_LOCK=y # # Power management options (ACPI, APM) # # CONFIG_PM is not set # # ACPI (Advanced Configuration and Power Interface) Support # # CONFIG_ACPI is not set # # CPU Frequency scaling # # CONFIG_CPU_FREQ is not set # # Bus options (PCI, PCMCIA, EISA, MCA, ISA) # CONFIG_PCI=y # CONFIG_PCI_GOBIOS is not set # CONFIG_PCI_GODIRECT is not set CONFIG_PCI_GOANY=y CONFIG_PCI_BIOS=y CONFIG_PCI_DIRECT=y # CONFIG_PCI_LEGACY_PROC is not set CONFIG_PCI_NAMES=y # CONFIG_ISA is not set # CONFIG_MCA is not set # CONFIG_SCx200 is not set # CONFIG_HOTPLUG is not set # # Executable file formats # CONFIG_BINFMT_ELF=y # CONFIG_BINFMT_AOUT is not set # CONFIG_BINFMT_MISC is not set # # Device Drivers # # # Generic Driver Options # # # Memory Technology Devices (MTD) # # CONFIG_MTD is not set # # Parallel port support # # CONFIG_PARPORT is not set # # Plug and Play support # # # Block devices # CONFIG_BLK_DEV_FD=y # CONFIG_BLK_CPQ_DA is not set # CONFIG_BLK_CPQ_CISS_DA is not set # CONFIG_BLK_DEV_DAC960 is not set CONFIG_BLK_DEV_LOOP=y # CONFIG_BLK_DEV_CRYPTOLOOP is not set # CONFIG_BLK_DEV_NBD is not set # CONFIG_BLK_DEV_RAM is not set # CONFIG_BLK_DEV_INITRD is not set # CONFIG_LBD is not set # # ATA/ATAPI/MFM/RLL support # CONFIG_IDE=y CONFIG_BLK_DEV_IDE=y # # Please see Documentation/ide.txt for help/info on IDE drives # # CONFIG_BLK_DEV_HD_IDE is not set CONFIG_BLK_DEV_IDEDISK=y CONFIG_IDEDISK_MULTI_MODE=y # CONFIG_IDEDISK_STROKE is not set CONFIG_BLK_DEV_IDECD=y # CONFIG_BLK_DEV_IDEFLOPPY is not set # CONFIG_IDE_TASK_IOCTL is not set # # IDE chipset support/bugfixes # CONFIG_IDE_GENERIC=y # CONFIG_BLK_DEV_CMD640 is not set CONFIG_BLK_DEV_IDEPCI=y CONFIG_IDEPCI_SHARE_IRQ=y # CONFIG_BLK_DEV_OFFBOARD is not set CONFIG_BLK_DEV_GENERIC=y # CONFIG_BLK_DEV_RZ1000 is not set CONFIG_BLK_DEV_IDEDMA_PCI=y # CONFIG_BLK_DEV_IDEDMA_FORCED is not set CONFIG_IDEDMA_PCI_AUTO=y # CONFIG_IDEDMA_ONLYDISK is not set CONFIG_BLK_DEV_ADMA=y # CONFIG_BLK_DEV_AEC62XX is not set # CONFIG_BLK_DEV_ALI15X3 is not set # CONFIG_BLK_DEV_AMD74XX is not set # CONFIG_BLK_DEV_CMD64X is not set # CONFIG_BLK_DEV_TRIFLEX is not set # CONFIG_BLK_DEV_CY82C693 is not set # CONFIG_BLK_DEV_CS5530 is not set # CONFIG_BLK_DEV_HPT34X is not set # CONFIG_BLK_DEV_HPT366 is not set # CONFIG_BLK_DEV_SC1200 is not set # CONFIG_BLK_DEV_PIIX is not set # CONFIG_BLK_DEV_NS87415 is not set # CONFIG_BLK_DEV_PDC202XX_OLD is not set # CONFIG_BLK_DEV_PDC202XX_NEW is not set # CONFIG_BLK_DEV_SVWKS is not set # CONFIG_BLK_DEV_SIIMAGE is not set # CONFIG_BLK_DEV_SIS5513 is not set # CONFIG_BLK_DEV_SLC90E66 is not set # CONFIG_BLK_DEV_TRM290 is not set CONFIG_BLK_DEV_VIA82CXXX=y CONFIG_BLK_DEV_IDEDMA=y # CONFIG_IDEDMA_IVB is not set CONFIG_IDEDMA_AUTO=y # CONFIG_DMA_NONPCI is not set # CONFIG_BLK_DEV_HD is not set # # SCSI device support # # CONFIG_SCSI is not set # # Multi-device support (RAID and LVM) # # CONFIG_MD is not set # # Fusion MPT device support # # # I2O device support # # CONFIG_I2O is not set # # Macintosh device drivers # # # Networking support # CONFIG_NET=y # # Networking options # CONFIG_PACKET=y CONFIG_PACKET_MMAP=y # CONFIG_NETLINK_DEV is not set CONFIG_UNIX=y # CONFIG_NET_KEY is not set CONFIG_INET=y # CONFIG_IP_MULTICAST is not set # CONFIG_IP_ADVANCED_ROUTER is not set # CONFIG_IP_PNP is not set # CONFIG_NET_IPIP is not set # CONFIG_NET_IPGRE is not set # CONFIG_INET_ECN is not set # CONFIG_SYN_COOKIES is not set # CONFIG_INET_AH is not set # CONFIG_INET_ESP is not set # CONFIG_INET_IPCOMP is not set # CONFIG_DECNET is not set # CONFIG_BRIDGE is not set # CONFIG_NETFILTER is not set # CONFIG_VLAN_8021Q is not set # CONFIG_LLC2 is not set # CONFIG_IPX is not set # CONFIG_ATALK is not set # # QoS and/or fair queueing # # CONFIG_NET_SCHED is not set # # Network testing # # CONFIG_NET_PKTGEN is not set # CONFIG_NETDEVICES is not set # # Amateur Radio support # # CONFIG_HAMRADIO is not set # # IrDA (infrared) support # # CONFIG_IRDA is not set # # Bluetooth support # # CONFIG_BT is not set # # ISDN subsystem # # CONFIG_ISDN_BOOL is not set # # Telephony Support # # CONFIG_PHONE is not set # # Input device support # CONFIG_INPUT=y # # Userland interfaces # CONFIG_INPUT_MOUSEDEV=y CONFIG_INPUT_MOUSEDEV_PSAUX=y CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024 CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768 # CONFIG_INPUT_JOYDEV is not set # CONFIG_INPUT_TSDEV is not set # CONFIG_INPUT_EVDEV is not set # CONFIG_INPUT_EVBUG is not set # # Input I/O drivers # # CONFIG_GAMEPORT is not set CONFIG_SOUND_GAMEPORT=y CONFIG_SERIO=y CONFIG_SERIO_I8042=y # CONFIG_SERIO_SERPORT is not set # CONFIG_SERIO_CT82C710 is not set # CONFIG_SERIO_PCIPS2 is not set # # Input Device Drivers # CONFIG_INPUT_KEYBOARD=y CONFIG_KEYBOARD_ATKBD=y # CONFIG_KEYBOARD_SUNKBD is not set # CONFIG_KEYBOARD_XTKBD is not set # CONFIG_KEYBOARD_NEWTON is not set CONFIG_INPUT_MOUSE=y CONFIG_MOUSE_PS2=y # CONFIG_MOUSE_SERIAL is not set # CONFIG_INPUT_JOYSTICK is not set # CONFIG_INPUT_TOUCHSCREEN is not set # CONFIG_INPUT_MISC is not set # # Character devices # CONFIG_VT=y CONFIG_VT_CONSOLE=y CONFIG_HW_CONSOLE=y # CONFIG_SERIAL_NONSTANDARD is not set # # Serial drivers # # CONFIG_SERIAL_8250 is not set # # Non-8250 serial port support # # CONFIG_UNIX98_PTYS is not set # # Mice # # CONFIG_BUSMOUSE is not set # CONFIG_QIC02_TAPE is not set # # IPMI # # CONFIG_IPMI_HANDLER is not set # # Watchdog Cards # # CONFIG_WATCHDOG is not set # CONFIG_HW_RANDOM is not set # CONFIG_NVRAM is not set # CONFIG_RTC is not set # CONFIG_GEN_RTC is not set # CONFIG_DTLK is not set # CONFIG_R3964 is not set # CONFIG_APPLICOM is not set # # Ftape, the floppy tape device driver # # CONFIG_FTAPE is not set # CONFIG_AGP is not set # CONFIG_DRM is not set # CONFIG_MWAVE is not set # CONFIG_RAW_DRIVER is not set # CONFIG_HANGCHECK_TIMER is not set # # I2C support # # CONFIG_I2C is not set # # Multimedia devices # # CONFIG_VIDEO_DEV is not set # # Digital Video Broadcasting Devices # # CONFIG_DVB is not set # # Graphics support # # CONFIG_FB is not set # CONFIG_VIDEO_SELECT is not set # # Console display driver support # CONFIG_VGA_CONSOLE=y # CONFIG_MDA_CONSOLE is not set CONFIG_DUMMY_CONSOLE=y # # Sound # # CONFIG_SOUND is not set # # USB support # # CONFIG_USB is not set # # USB Gadget Support # # CONFIG_USB_GADGET is not set # # File systems # CONFIG_EXT2_FS=y # CONFIG_EXT2_FS_XATTR is not set # CONFIG_EXT3_FS is not set # CONFIG_JBD is not set CONFIG_REISERFS_FS=y # CONFIG_REISERFS_CHECK is not set # CONFIG_REISERFS_PROC_INFO is not set # CONFIG_JFS_FS is not set # CONFIG_XFS_FS is not set # CONFIG_MINIX_FS is not set # CONFIG_ROMFS_FS is not set # CONFIG_QUOTA is not set # CONFIG_AUTOFS_FS is not set # CONFIG_AUTOFS4_FS is not set # # CD-ROM/DVD Filesystems # CONFIG_ISO9660_FS=y CONFIG_JOLIET=y # CONFIG_ZISOFS is not set # CONFIG_UDF_FS is not set # # DOS/FAT/NT Filesystems # CONFIG_FAT_FS=y CONFIG_MSDOS_FS=y CONFIG_VFAT_FS=y # CONFIG_NTFS_FS is not set # # Pseudo filesystems # CONFIG_PROC_FS=y CONFIG_PROC_KCORE=y CONFIG_TMPFS=y # CONFIG_HUGETLBFS is not set # CONFIG_HUGETLB_PAGE is not set CONFIG_RAMFS=y # # Miscellaneous filesystems # # CONFIG_CRAMFS is not set # CONFIG_VXFS_FS is not set # CONFIG_HPFS_FS is not set # CONFIG_QNX4FS_FS is not set # CONFIG_SYSV_FS is not set # CONFIG_UFS_FS is not set # # Network File Systems # # CONFIG_NFS_FS is not set # CONFIG_NFSD is not set # CONFIG_EXPORTFS is not set # CONFIG_SMB_FS is not set # CONFIG_CIFS is not set # CONFIG_NCP_FS is not set # CONFIG_CODA_FS is not set # # Partition Types # # CONFIG_PARTITION_ADVANCED is not set CONFIG_MSDOS_PARTITION=y # # Native Language Support # CONFIG_NLS=y CONFIG_NLS_DEFAULT="iso8859-1" CONFIG_NLS_CODEPAGE_437=y # CONFIG_NLS_CODEPAGE_737 is not set # CONFIG_NLS_CODEPAGE_775 is not set # CONFIG_NLS_CODEPAGE_850 is not set # CONFIG_NLS_CODEPAGE_852 is not set # CONFIG_NLS_CODEPAGE_855 is not set # CONFIG_NLS_CODEPAGE_857 is not set # CONFIG_NLS_CODEPAGE_860 is not set # CONFIG_NLS_CODEPAGE_861 is not set # CONFIG_NLS_CODEPAGE_862 is not set # CONFIG_NLS_CODEPAGE_863 is not set # CONFIG_NLS_CODEPAGE_864 is not set # CONFIG_NLS_CODEPAGE_865 is not set # CONFIG_NLS_CODEPAGE_866 is not set # CONFIG_NLS_CODEPAGE_869 is not set # CONFIG_NLS_CODEPAGE_936 is not set # CONFIG_NLS_CODEPAGE_950 is not set # CONFIG_NLS_CODEPAGE_932 is not set # CONFIG_NLS_CODEPAGE_949 is not set # CONFIG_NLS_CODEPAGE_874 is not set # CONFIG_NLS_ISO8859_8 is not set # CONFIG_NLS_CODEPAGE_1250 is not set # CONFIG_NLS_CODEPAGE_1251 is not set CONFIG_NLS_ISO8859_1=y # CONFIG_NLS_ISO8859_2 is not set # CONFIG_NLS_ISO8859_3 is not set # CONFIG_NLS_ISO8859_4 is not set # CONFIG_NLS_ISO8859_5 is not set # CONFIG_NLS_ISO8859_6 is not set # CONFIG_NLS_ISO8859_7 is not set # CONFIG_NLS_ISO8859_9 is not set # CONFIG_NLS_ISO8859_13 is not set # CONFIG_NLS_ISO8859_14 is not set # CONFIG_NLS_ISO8859_15 is not set # CONFIG_NLS_KOI8_R is not set # CONFIG_NLS_KOI8_U is not set # CONFIG_NLS_UTF8 is not set # # Kernel hacking # CONFIG_DEBUG_KERNEL=y # CONFIG_DEBUG_STACKOVERFLOW is not set # CONFIG_DEBUG_SLAB is not set # CONFIG_DEBUG_IOVIRT is not set CONFIG_MAGIC_SYSRQ=y # CONFIG_DEBUG_SPINLOCK is not set # CONFIG_DEBUG_PAGEALLOC is not set # CONFIG_DEBUG_INFO is not set CONFIG_DEBUG_SPINLOCK_SLEEP=y # CONFIG_FRAME_POINTER is not set # # Security options # # CONFIG_SECURITY is not set # # Cryptographic options # # CONFIG_CRYPTO is not set # # Library routines # CONFIG_CRC32=y CONFIG_X86_BIOS_REBOOT=y CONFIG_PC=y -- Paolo Ornati Linux v2.6.3