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    Subjectvery poor performance in 2.5.66[-mm1]

    Hi list.

    After all of the rave reviews about the interactivity fixes (both regular
    and I/O scheduler related), I decided to give the 2.5.latest a try on my
    desktop machine (system described below)

    I started X, everything seemed fine, maybe a bit faster. I opened a
    'gnome-terminal' and typed 'ls -ltr'. Wow, it was 20x slower.

    Here are the timings for 'ls -ltr':

    2.5.66-mm1: 'ls -ltr' 31 seconds
    2.5.66-mm1: 'ls -ltr | cat' 2 seconds
    2.4.18-rhlatest: 'ls -ltr' 1.14 seconds

    I also tried 2.5.66 vanilla with the exact same results. Everything else
    seemed fine about the system.

    I'm running Red Hat 8.0 updated to the latest packages, and I know that
    the anti-aliasing that gnome-terminal does takes a ton of CPU time. In
    fact, all of the 31 seconds above is used by X. You can see that when the
    output of 'ls' is piped through 'cat' (essentially changing the output
    from line buffered to block buffered), the time went down dramatically.

    I also have noticed in the past that under redhat 8.0, X runs at nice -10.
    With the 2.5.66 kernel it was 'nice 0' (i.e. not reniced). I tried
    various renicing, both positive and negative (+/- 1), to no effect. Also,
    renicing X to 0 in 2.4.18-rhlatest doesn't cause the above abnormality.

    This must be some scheduler interaction issue that has changed the way X
    buffers it's redraw requests or something. Seems like something that used
    to be asynchronous is now synchronous. Just a guess.

    System:

    UP,Preempt Athlon 1.4 Ghz, 512MB ram, IDE, SiS chipset for ide and video

    Kernel config:

    CONFIG_X86=y
    CONFIG_MMU=y
    CONFIG_UID16=y
    CONFIG_GENERIC_ISA_DMA=y
    CONFIG_EXPERIMENTAL=y
    CONFIG_SWAP=y
    CONFIG_SYSVIPC=y
    CONFIG_SYSCTL=y
    CONFIG_LOG_BUF_SHIFT=14
    CONFIG_X86_PC=y
    CONFIG_MK7=y
    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_USE_PPRO_CHECKSUM=y
    CONFIG_X86_USE_3DNOW=y
    CONFIG_PREEMPT=y
    CONFIG_X86_TSC=y
    CONFIG_X86_MCE=y
    CONFIG_X86_MCE_NONFATAL=y
    CONFIG_MICROCODE=y
    CONFIG_X86_MSR=y
    CONFIG_X86_CPUID=y
    CONFIG_HIGHMEM4G=y
    CONFIG_HIGHMEM=y
    CONFIG_MTRR=y
    CONFIG_HAVE_DEC_LOCK=y
    CONFIG_PCI=y
    CONFIG_PCI_GOANY=y
    CONFIG_PCI_BIOS=y
    CONFIG_PCI_DIRECT=y
    CONFIG_PCI_NAMES=y
    CONFIG_ISA=y
    CONFIG_KCORE_ELF=y
    CONFIG_BINFMT_ELF=y
    CONFIG_PARPORT=y
    CONFIG_PARPORT_PC=y
    CONFIG_PARPORT_PC_CML1=y
    CONFIG_PARPORT_SERIAL=y
    CONFIG_PARPORT_PC_FIFO=y
    CONFIG_PARPORT_1284=y
    CONFIG_BLK_DEV_FD=y
    CONFIG_BLK_DEV_LOOP=y
    CONFIG_BLK_DEV_NBD=y
    CONFIG_BLK_DEV_RAM=y
    CONFIG_BLK_DEV_RAM_SIZE=4096
    CONFIG_BLK_DEV_INITRD=y
    CONFIG_IDE=y
    CONFIG_BLK_DEV_IDE=y
    CONFIG_BLK_DEV_IDEDISK=y
    CONFIG_IDEDISK_MULTI_MODE=y
    CONFIG_BLK_DEV_IDECD=y
    CONFIG_BLK_DEV_IDESCSI=y
    CONFIG_BLK_DEV_IDEPCI=y
    CONFIG_IDEPCI_SHARE_IRQ=y
    CONFIG_BLK_DEV_IDEDMA_PCI=y
    CONFIG_IDEDMA_PCI_AUTO=y
    CONFIG_BLK_DEV_IDEDMA=y
    CONFIG_BLK_DEV_ADMA=y
    CONFIG_BLK_DEV_SIS5513=y
    CONFIG_IDEDMA_AUTO=y
    CONFIG_BLK_DEV_IDE_MODES=y
    CONFIG_SCSI=y
    CONFIG_BLK_DEV_SR=y
    CONFIG_BLK_DEV_SR_VENDOR=y
    CONFIG_CHR_DEV_SG=y
    CONFIG_SCSI_REPORT_LUNS=y
    CONFIG_MD=y
    CONFIG_BLK_DEV_MD=y
    CONFIG_MD_LINEAR=y
    CONFIG_MD_RAID0=y
    CONFIG_MD_RAID1=y
    CONFIG_MD_RAID5=y
    CONFIG_BLK_DEV_DM=y
    CONFIG_NET=y
    CONFIG_PACKET=y
    CONFIG_PACKET_MMAP=y
    CONFIG_NETLINK_DEV=y
    CONFIG_UNIX=y
    CONFIG_INET=y
    CONFIG_IP_MULTICAST=y
    CONFIG_SYN_COOKIES=y
    CONFIG_IPV6_SCTP__=y
    CONFIG_NETDEVICES=y
    CONFIG_DUMMY=y
    CONFIG_TUN=y
    CONFIG_NET_ETHERNET=y
    CONFIG_NET_PCI=y
    CONFIG_8139TOO=y
    CONFIG_INPUT=y
    CONFIG_INPUT_MOUSEDEV=y
    CONFIG_INPUT_MOUSEDEV_PSAUX=y
    CONFIG_INPUT_MOUSEDEV_SCREEN_X=1024
    CONFIG_INPUT_MOUSEDEV_SCREEN_Y=768
    CONFIG_INPUT_EVDEV=y
    CONFIG_SOUND_GAMEPORT=y
    CONFIG_SERIO=y
    CONFIG_SERIO_I8042=y
    CONFIG_SERIO_SERPORT=y
    CONFIG_INPUT_KEYBOARD=y
    CONFIG_KEYBOARD_ATKBD=y
    CONFIG_INPUT_MOUSE=y
    CONFIG_MOUSE_PS2=y
    CONFIG_VT=y
    CONFIG_VT_CONSOLE=y
    CONFIG_HW_CONSOLE=y
    CONFIG_SERIAL_8250=y
    CONFIG_SERIAL_8250_CONSOLE=y
    CONFIG_SERIAL_CORE=y
    CONFIG_SERIAL_CORE_CONSOLE=y
    CONFIG_UNIX98_PTYS=y
    CONFIG_UNIX98_PTY_COUNT=2048
    CONFIG_PRINTER=y
    CONFIG_LP_CONSOLE=y
    CONFIG_PPDEV=y
    CONFIG_NVRAM=y
    CONFIG_RTC=y
    CONFIG_AGP=y
    CONFIG_AGP_SIS=y
    CONFIG_RAW_DRIVER=y
    CONFIG_EXT2_FS=y
    CONFIG_EXT3_FS=y
    CONFIG_JBD=y
    CONFIG_MINIX_FS=y
    CONFIG_ISO9660_FS=y
    CONFIG_JOLIET=y
    CONFIG_ZISOFS=y
    CONFIG_ZISOFS_FS=y
    CONFIG_UDF_FS=y
    CONFIG_FAT_FS=y
    CONFIG_MSDOS_FS=y
    CONFIG_VFAT_FS=y
    CONFIG_PROC_FS=y
    CONFIG_DEVPTS_FS=y
    CONFIG_TMPFS=y
    CONFIG_RAMFS=y
    CONFIG_NFS_FS=y
    CONFIG_NFS_V3=y
    CONFIG_LOCKD=y
    CONFIG_LOCKD_V4=y
    CONFIG_SUNRPC=y
    CONFIG_SMB_FS=y
    CONFIG_PARTITION_ADVANCED=y
    CONFIG_MSDOS_PARTITION=y
    CONFIG_SMB_NLS=y
    CONFIG_NLS=y
    CONFIG_NLS_DEFAULT="iso8859-1"
    CONFIG_NLS_CODEPAGE_437=y
    CONFIG_NLS_ISO8859_1=y
    CONFIG_NLS_ISO8859_15=y
    CONFIG_NLS_UTF8=y
    CONFIG_VIDEO_SELECT=y
    CONFIG_VGA_CONSOLE=y
    CONFIG_DUMMY_CONSOLE=y
    CONFIG_SOUND=y
    CONFIG_SND=y
    CONFIG_SND_OSSEMUL=y
    CONFIG_SND_MIXER_OSS=y
    CONFIG_SND_PCM_OSS=y
    CONFIG_SND_RTCTIMER=y
    CONFIG_SND_TRIDENT=y
    CONFIG_USB=y
    CONFIG_USB_DEVICEFS=y
    CONFIG_USB_OHCI_HCD=y
    CONFIG_USB_AUDIO=y
    CONFIG_USB_ACM=y
    CONFIG_USB_PRINTER=y
    CONFIG_USB_STORAGE=y
    CONFIG_USB_STORAGE_DATAFAB=y
    CONFIG_USB_STORAGE_FREECOM=y
    CONFIG_USB_STORAGE_ISD200=y
    CONFIG_USB_STORAGE_DPCM=y
    CONFIG_USB_STORAGE_HP8200e=y
    CONFIG_USB_STORAGE_SDDR09=y
    CONFIG_USB_STORAGE_JUMPSHOT=y
    CONFIG_USB_HID=y
    CONFIG_USB_HIDINPUT=y
    CONFIG_DEBUG_KERNEL=y
    CONFIG_MAGIC_SYSRQ=y
    CONFIG_KALLSYMS=y
    CONFIG_ZLIB_INFLATE=y
    CONFIG_X86_BIOS_REBOOT=y

    --
    /==============================\
    | David Mansfield |
    | lkml@dm.cobite.com |
    \==============================/

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