[Centos] Re: kernel question

William Warren hescominsoon at emmanuelcomputerconsulting.com
Tue Sep 21 18:29:05 UTC 2004

read the pugzilla post for redhat here:


there was a series of patches released..but patching the kernel 
is beyond my abililties right now.  I am running hte new kernel 
and am watching my little server's memory performance.

Bart Schaefer wrote:

> William Warren wrote:
>>An interesting bug in RHEL 3(which affects CentOS 3) has been 
>>bantered around for a while.  There are some kernel 
>>patches(beyond my scope right now) or some echo statements tht 
>>are used(this helped my situation).
>>   https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=89226
> I don't have any direct feedback on Warren's [not excerpted] question 
> about using other kernels, but I have some feedback on the echo statements 
> that he mentions.
> I had been noticing that memory-intensive apps such as Mozilla were taking 
> a very long time to swap back in after having been idle overnight -- more 
> than a couple of minutes, often, when I would switch desktops for the 
> first time each day to the one where I keep Moz running, before the window
> would refresh.
> Scanning through the bugzilla report, I saw the kernel patch that changes
> the vm.pagecache defaults.  So I executed
> 	echo "1 5 10" > /proc/sys/vm/pagecache
> My applications are now MUCH more responsive; there's never a delay before 
> the Mozilla window refreshes, and VMware works noticeably better.  If you
> are running CentOS 3.1 or RHEL3, you might want to try this, even if you
> aren't seeing serious problems with swapping.
> This brings me to two questions:
> (1) Is the aforementioned kernel patch already present in the CentOS-3.3
>     kernels?
> (2) (Somwhat OT) Is there an equivalent pagecache tweak for RedHat 9?  The
>     /proc/sys/vm/pagecache "device" is not present in RH9.
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My "Foundation" verse:
Isa 54:17  No weapon that is formed against thee shall prosper; 
and every tongue that shall rise against thee in judgment thou 
shalt condemn. This is the heritage of the servants of the LORD, 
and their righteousness is of me, saith the LORD.

-- carpe ductum -- "Grab the tape"

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