Feb 16 00:24:05 aramis kernel: swapper: page allocation failure. order:0,mode:0x20
我想知道：@H_404_5@
>这条消息到底意味着什么？
>我的服务器内存不足吗？@H_404_5@
交换使用率非常低(低于10％),到目前为止,我没有注意到由于内存不足而导致任何进程被杀死.@H_404_5@
附加信息：@H_404_5@
>服务器是运行Debian 6.0的Xen实例(DomU)
>它有512 MB的RAM和512 MB的交换分区
>虚拟机内的cpu负载平均显示为0.25@H_404_5@
解决方法
#change value for this boot sysctl -w vm.min_free_kbytes=65536 #change value for subsequent boots echo "vm.min_free_kbytes=65536" >> /etc/sysctl.conf
http://russ.garrett.co.uk/2009/01/01/linux-kernel-tuning/讨论了何时更改此设置可能有用,转载于此处：@H_404_5@
This tells the kernel to try and keep 64MB of RAM free at all times.
It’s useful in two main cases:@H_404_5@
Swap-less machines,where you don’t want incoming network traffic to overwhelm the kernel and force an OOM before it has time to flush
any buffers.@H_404_5@x86 machines,for the same reason: the x86 architecture only allows DMA transfers below approximately 900MB of RAM. So you can end
up with the bizarre situation of an OOM error with tons of RAM free.@H_404_5@
