From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.12) Gecko/20050922 Fedora/1.0.7-1.1.fc3 Firefox/1.0.7 Description of problem: I notice very high CPU wait utilization and slow disk operation during varios disk operation with MegaRaid. For example: 190 mb test file 1.coping file inside one disk parttion # time cp fedora-ds.tar fedora-ds.tar1 real 0m58.426s user 0m0.096s sys 0m2.252s the top show me Tasks: 70 total, 1 running, 69 sleeping, 0 stopped, 0 zombie Cpu(s): 0.3% us, 4.0% sy, 0.0% ni, 0.0% id, 95.7% wa, 0.0% hi, 0.0% si Mem: 514740k total, 508260k used, 6480k free, 1192k buffers Swap: 1048568k total, 616k used, 1047952k free, 469152k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 22384 root 18 0 3744 628 552 D 2.3 0.1 0:00.32 cp 22359 root 16 0 2016 1040 808 R 0.7 0.2 0:00.53 top in /var/log/dmesg ...... PCI: setting IRQ 11 as level-triggered PCI: Assigned IRQ 11 for device 0000:03:02.1 megaraid: found 0x8086:0x1960:bus 3:slot 2:func 1 scsi2:Found MegaRAID controller at 0xe082c000, IRQ:11 megaraid: [..F :..B ] detected 1 logical drives. megaraid: channel[0] is raid. scsi2 : LSI Logic MegaRAID ..F 254 commands 16 targs 4 chans 7 luns scsi2: scanning scsi channel 0 for logical drives. Vendor: MegaRAID Model: LD0 RAID5 17354R Rev: F Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 35540992 512-byte hdwr sectors (18197 MB) sda: asking for cache data failed sda: assuming drive cache: write through ....... asking for cache data failed - is it normaly? for information /sbin/lspci -s 03:02.1 -v -x 03:02.1 RAID bus controller: Intel Corporation 80960RP [i960RP Microprocessor] (rev 05) Subsystem: Hewlett-Packard Company HP NetRAID-1Si Flags: bus master, medium devsel, latency 64, IRQ 11 Memory at fd010000 (32-bit, prefetchable) [size=64K] [virtual] Expansion ROM at 20020000 [disabled] [size=32K] Capabilities: [80] Power Management version 2 00: 86 80 60 19 16 01 90 02 05 00 04 01 08 40 80 00 10: 08 00 01 fd 00 00 00 00 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 3c 10 cd 10 30: 00 00 00 00 80 00 00 00 00 00 00 00 0b 01 00 00 Version-Release number of selected component (if applicable): kernel-2.6.13-1.1526 How reproducible: Always Steps to Reproduce: 1.Install FC4 2.Create any test file with size 200-300 mb 3.execute time cp test_file test_file2 4.During coping look at 'CPU IO wait' in top Additional info:
2.6.14-1.1637_FC4 has been released as an update for FC4. Please retest with this update, as a large amount of code has been changed in this release, which may have fixed your problem. Thank you.
This is a mass-update to all currently open kernel bugs. A new kernel update has been released (Version: 2.6.15-1.1830_FC4) based upon a new upstream kernel release. Please retest against this new kernel, as a large number of patches go into each upstream release, possibly including changes that may address this problem. This bug has been placed in NEEDINFO_REPORTER state. Due to the large volume of inactive bugs in bugzilla, if this bug is still in this state in two weeks time, it will be closed. Should this bug still be relevant after this period, the reporter can reopen the bug at any time. Any other users on the Cc: list of this bug can request that the bug be reopened by adding a comment to the bug. If this bug is a problem preventing you from installing the release this version is filed against, please see bug 169613. Thank you.
Closing per previous comment.