[CentOS] centos + kswapd0 error

[Johnny Hughes]

On Fri, 2005-05-13 at 13:50 -0600, mbeltran at americatel.com.sv wrote:

> > >> Hi all
> > >> 
> > >> I have a box with Centos 4 and qmail with all pathches. since Last
> month
> > i
> > >> have had twice the same problem. The process kswapd0 uses all my
> > resources
> > >> of CPU and RAM memory and the consequence is that my local queue
> grow up
> > and
> > >> the box go slow too.
> > >> 
> > >> The first time i guess the problem was the version of the kernel,
> so i
> > did
> > >> an upgrade form kernel.i686 2.6.9-5.0.3.EL to kernel.i686
> 2.6.9-5.0.5.EL
> > >> 
> > >> apparently the problem was solved but today the problem came again.
> The
> > >> following snapshot shows the situation:
> > >> 
> > >> 
> > >> top - 10:53:48 up 16 days, 20:05,  1 user,  load average: 119.27,
> 116.16,
> > >> 114.33
> > >> Tasks: 528 total,  13 running, 515 sleeping,   0 stopped,   0
> zombie
> > >> Cpu(s):  5.4% us, 89.4% sy,  0.0% ni,  0.3% id,  4.8% wa,  0.0% hi,
> 0.1%
> > si
> > >> Mem:   2075012k total,  2073404k used,     1608k free,    71056k
> buffers
> > >> Swap:  4192924k total,  4192924k used,        0k free,    36380k
> cached
> > >> 
> > >> PID    USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+
> COMMAND
> > >> 60     root      17   0     0    0    0 D 75.4  0.0   585:22.79
> kswapd0
> > >> 2164   root      15   0  1736  484  432 S 31.0  0.0   31:57.07
> > couriertcpd
> > >> 16334  vpopmail  19   0  2660  804  668 R 24.7  0.0   0:01.69
> imapd
> > >> 2158   root      15   0  3264  488  432 S 23.4  0.0   1:17.51
> > couriertcpd
> > >> 32608  apache    16   0 21604 8440 3016 R 15.5  0.4   1:38.09
> httpd
> > >> 15284  vpopmail  18   0  4384 1032  760 R 14.9  0.0   0:08.32
> > vdelivermail
> > >> 
> > >> 
> > >> 
> > >> I really do not know what thing should i do for solve this problem
> > >> 
> > >> thanks in advance
> > >> 
> > >> Mario
> > >
> > >I think this bug is your problem:
> > >
> > >https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=150971
> > >
> > >You can try the kernel at:
> > >
> > >http://people.redhat.com/davej/kernels/RHEL4/RPMS.kernel/
> > >
> > >(or I can give you version 2.6.9-6.37.EL that is in 4Update1 beta)
> > 
> > Hi Mr. Hughes
> > 
> > The kernel version 2.6.9-6.37.EL has known issues
> 
> >That is the only other one I have for EL4 (other than the released
> >kernels).
> 
> >Maybe the 2.6.9-10.EL then ... but that is pretty new ... he just made
> >it yesterday :)
> 
> Hi again Mr Hughes
> 
> So sorry but i forgot the question mark :S
> 
> I really want to know if this kernel has known issues (The kernel version
> 2.6.9-6.37.EL has known issues?)
> 

OK ... got it :)

The 2.6.9-6.37.EL kernel is supposed to fix the memory bug that I
pointed to earlier.  The 2.6.9-10.EL kernel is also supposed to fix that
issue.

As to other issues, I am sure there are some ... but none that I know
about.
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