我在vmware-esxi虚拟化中使用debian 7 x64.
每个客户端的最大下载量为1mb / s,Nginx一起使用不超过50mbps,我的问题是什么可能导致传输速度变慢？
服务器
**Settings for eth1:
Supported ports: [ TP ]
Supported link modes: 1000baseT/Full
10000baseT/Full**
root@www:~# iostat
Linux 3.2.0-4-amd64 (www) 09.02.2015 _x86_64_ (4 cpu)
avg-cpu: %user %nice %system %iowait %steal %idle
1,75 0,00 0,76 0,64 0,00 96,84
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
sda 173,93 1736,11 219,06 354600 44744
root@www:~# free -m
total used free shared buffers cached
Mem: 12048 1047 11000 0 106 442
-/+ buffers/cache: 498 11549
Swap: 713 0 713
Nginx.cof
user www-data; worker_processes 4; pid /var/run/Nginx.pid; events { worker_connections 3072; # multi_accept on; } http { ## # Basic Settings ## sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 5; types_hash_max_size 2048; server_tokens off; # server_names_hash_bucket_size 64; # server_name_in_redirect off; include /etc/Nginx/mime.types; default_type application/octet-stream; ## # Logging Settings ## access_log /var/log/Nginx/access.log; error_log /var/log/Nginx/error.log; ## # Gzip Settings ## gzip on; gzip_disable "msie6"; # gzip_vary on; # gzip_proxied any; # gzip_comp_level 6; # gzip_buffers 16 8k; # gzip_http_version 1.1; # gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+RSS text/javascript; ## # Nginx-naxsi config ## # Uncomment it if you installed Nginx-naxsi ## #include /etc/Nginx/naxsi_core.rules; ## Start: Size Limits & Buffer Overflows ## client_body_buffer_size 1k; client_header_buffer_size 1k; client_max_body_size 4M; large_client_header_buffers 2 1k; ## END: Size Limits & Buffer Overflows ## ## Start: Timeouts ## client_body_timeout 10; client_header_timeout 10; send_timeout 10; ## End: Timeouts ## ## END: Size Limits & Buffer Overflof ## # Nginx-passenger config ## # Uncomment it if you installed Nginx-passenger ## #passenger_root /usr; #passenger_ruby /usr/bin/ruby; ## # Virtual Host Configs ## include /etc/Nginx/conf.d/*.conf; include /etc/Nginx/sites-enabled/*; }
/etc/sysctl.conf中
# Increase system IP port limits to allow for more connections net.ipv4.ip_local_port_range = 2000 65000 net.ipv4.tcp_window_scaling = 1 # number of packets to keep in backlog before the kernel starts dropping them net.ipv4.tcp_max_syn_backlog = 3240000 # increase socket listen backlog net.core.somaxconn = 3240000 net.ipv4.tcp_max_tw_buckets = 1440000 # Increase TCP buffer sizes net.core.rmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.ipv4.tcp_rmem = 4096 87380 16777216 net.ipv4.tcp_wmem = 4096 65536 16777216
更新：
调试日志完全为空,只有当我手动取消下载时才会出现以下错误
2015/02/09 20:05:32 [info] 4452#0: *2786 client prematurely closed connection while sending response to client,client: 83.11.xxx.xxx,server: xxx.com,request: "GET filename HTTP/1.1",host: "xxx.com"
卷曲输出：
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 1309M 100 1309M 0 0 374M 0 0:00:03 0:00:03 --:--:-- 382M
解决方法
通过Google为这里的任何人提供答案：
Sendfile是阻塞的,并且不允许Nginx设置前瞻,因此如果文件只读取一次,效率非常低.
Sendfile依赖于文件系统缓存等,并且从未为这样的大文件做过.
你想要的是禁用大文件的sendfile,并使用directio(最好使用线程,因此它是非阻塞的).
仍然可以使用sendfile读取16MB以下的任何文件.
aio threads; directio 16M; output_buffers 2 1M; sendfile on; sendfile_max_chunk 512k;
通过使用directio,您可以直接从磁盘读取,在途中跳过许多步骤.
附：
请注意,要使用aio线程,您需要使用支持https://www.nginx.com/blog/thread-pools-boost-performance-9x/的线程编译Nginx
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