Nginx做负载均衡报:nginx: [emerg] could not build the types_hash

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　　环境：KVM/Centos6.3
　　用Nginx做负载均衡的时候在配置完成后，启动Nginx的时候报：
nginx: [emerg] could not build the types_hash, you should increase either types_hash_max_size: 1024 or types_hash_bucket_size: 32　　解决方法：在nginx配置文件http模块添加:types_hash_max_size 2048;
http{　　include       mime.types;
　　default_type application/octet-stream;
　　types_hash_max_size 2048;
　　server_names_hash_bucket_size 128;
　　client_header_buffer_size 32k;
　　large_client_header_buffers 4 32k;
　　错误原因真心不知道，只能Google了，方法找到了，错误原因也找到了，但真心不明白什么意思。
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　　I found out nginx is reporting the wrong cache line>　　On startup it reports:
　　Restarting nginx: nginx: [emerg] could not build the types_hash, you should
　　increase either types_hash_max_size: 1024 or types_hash_bucket_size: 32
　　This is caused by /etc/nginx/mime.types having a key which is 36 bytes long:

　　echo -n application/vnd.google-earth.kml+xml |wc -c
　　36

　　In src/core/ngx_cpuinfo.c , the ngx_cpuinfo() reports my CPU has having a 32 bytes cache line which is then used as the default value for types_hash_bucket_size and thus trigger the startup error.