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PostPosted: Tue Oct 08, 2013 1:59 pm 
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Senior Member

Joined: Sun Mar 28, 2010 2:43 pm
Posts: 76
Website: http://tomakefast.com
Location: Texas
Is there any harm in setting it higher than 16384 to 65536?

Right now I'm at vm.min_free_kbytes = 3429

I found this on the Fedora website, which is what I'm using on the Linode that went down.

Quote:
Unable to Allocate Memory / page allocation failure

Heavily-loaded network servers may have trouble allocating memory even though there is no shortage. Try setting the sysctl vm.min_free_kbytes to 65536 in order to keep additional memory free for allocation by network drivers.


Same error 16 days ago but that was "order:2" and today was "order:4" whatever that means. Looking at Linode graphs, just before the crash outgoing traffic was getting up over 5 Mbits/second (only around 3 Mbits/second in the morning) so I wonder if this "panic" was due to the server working harder. (Last night added more images to the website.)

Maybe this thread is old but it's nice to see other people were able to fix their "page allocation failure".

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PostPosted: Tue Oct 08, 2013 2:04 pm 
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Sysop

Joined: Sat Nov 27, 2010 3:32 am
Posts: 180
Website: https://blog.timheckman.net/
Location: San Francisco, CA
If you are still on our 2.6.x tree of kernels you need to upgrade. I also believe these issues are fixed in newer kernels. In addition to that, the 2.6.x line have a local root-escalation bug that's a bit concerning.

I'd suggest selecting the Latest 32-bit (or 64-bit if your OS is 64-bit) kernel in the Configuration Profile editor in the Linode Manager and then reboot.

-Tim

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'If debugging is the process of removing bugs, then programming must be the process of putting them in.' //Edsger Dijkstra
'Nothing is withheld from us which we have conceived to do.' | 'Do things that have never been done.' //Russell Kirsch


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