[Bug 13307] New: Constant High SoftIRQ

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Ubuntu | linux

           Summary: Constant High SoftIRQ
           Product: Ubuntu
           Version: unspecified
          Platform: i386
               URL: http://kerneltrap.org/node/5534#comment-190748
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: linux
        AssignedTo: fabbione at ubuntu.com
        ReportedBy: askxfs at gmail.com
         QAContact: kernel-bugs at lists.ubuntu.com
                CC: askxfs at gmail.com


Hello, I am running Ubuntu Linux, with kernel version 2.6.12, on a HP ze2113us
laptop,
I had a hard time configuring it, until I find out that the standard 2.6.10
kernel that comes with it does not support the onboard ATI ide, so no DMA was
avaliable, upgrading the kernel fixed that, but now I have my CPU at 50% use all
time, even on single user mode with no daemons running at all.

I tried 2.6.11 and 2.6.12 from backports.

check vmstat sy field.
alvaro at pavilhao:~$ vmstat -n 2

procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 3  0      0  33704  45628 258656    0    0    21    44 1026   243  3 51 45  1
 0  0      0  33704  45628 258656    0    0     0     0 1011    93  0 50 50  0
 0  0      0  33704  45628 258656    0    0     0     0 1011    88  0 50 50  0
 0  0      0  33688  45628 258656    0    0     0    38 1026   125  0 50 50  0
 0  0      0  33688  45628 258656    0    0     0     0 1011    80  0 50 50  0
 0  0      0  33672  45628 258656    0    0     0    18 1015   116  2 50 48  0
op also show 50% use, but no process is using that (see picture attached).

Cpu(s): 4.7% us, 0.7% sy, 0.0% ni, 44.5% id, 0.0% wa, 0.3% hi, 49.8% si

Any hints?

Thanks

Álvaro
Brazil

Ps - I assume the 'si' field on top is soft irq, but I was unable to find any
info on Google to confirm that)

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