查看Linux的系统配置-参数长度最大限制( Shell最大支持定义一个多长的字符串变量？
Linux\u7cfb\u7edf\u8c03\u4f18\u53c2\u6570\u77e5\u591a\u5c11\u6240\u6709\u7684TCP/IP\u8c03\u4f18\u53c2\u6570\u90fd\u4f4d\u4e8e/proc/sys/net/\u76ee\u5f55\u3002\u4f8b\u5982, \u4e0b\u9762\u662f\u6700\u91cd\u8981\u7684\u4e00\u4e9b\u8c03\u4f18\u53c2\u6570\uff0c\u540e\u9762\u662f\u5b83\u4eec\u7684\u542b\u4e49\uff1a
1\u3001/proc/sys/net/core/rmem_max \u2014 \u6700\u5927\u7684TCP\u6570\u636e\u63a5\u6536\u7f13\u51b2
2\u3001/proc/sys/net/core/wmem_max \u2014 \u6700\u5927\u7684TCP\u6570\u636e\u53d1\u9001\u7f13\u51b2
3\u3001/proc/sys/net/ipv4/tcp_timestamps \u2014 \u65f6\u95f4\u6233\u5728(\u8bf7\u53c2\u8003RFC 1323)TCP\u7684\u5305\u5934\u589e\u52a012\u4e2a\u5b57\u8282
4\u3001/proc/sys/net/ipv4/tcp_sack \u2014 \u6709\u9009\u62e9\u7684\u5e94\u7b54
5\u3001/proc/sys/net/ipv4/tcp_window_scaling \u2014 \u652f\u6301\u66f4\u5927\u7684TCP\u7a97\u53e3. \u5982\u679cTCP\u7a97\u53e3\u6700\u5927\u8d85\u8fc765535(64K), \u5fc5\u987b\u8bbe\u7f6e\u8be5\u6570\u503c\u4e3a1
6\u3001rmem_default \u2014 \u9ed8\u8ba4\u7684\u63a5\u6536\u7a97\u53e3\u5927\u5c0f
7\u3001rmem_max \u2014 \u63a5\u6536\u7a97\u53e3\u7684\u6700\u5927\u5927\u5c0f
8\u3001wmem_default \u2014 \u9ed8\u8ba4\u7684\u53d1\u9001\u7a97\u53e3\u5927\u5c0f
9. wmem_max \u2014 \u53d1\u9001\u7a97\u53e3\u7684\u6700\u5927\u5927\u5c0f
/proc\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u5185\u5bb9\u90fd\u662f\u4e34\u65f6\u6027\u7684, \u6240\u4ee5\u91cd\u542f\u52a8\u7cfb\u7edf\u540e\u4efb\u4f55\u4fee\u6539\u90fd\u4f1a\u4e22\u5931.
\u5efa\u8bae\u5728\u7cfb\u7edf\u542f\u52a8\u65f6\u81ea\u52a8\u4fee\u6539TCP/IP\u53c2\u6570:
\u628a\u4e0b\u9762\u4ee3\u7801\u589e\u52a0\u5230/etc/rc.local\u6587\u4ef6, \u7136\u540e\u4fdd\u5b58\u6587\u4ef6, \u7cfb\u7edf\u91cd\u65b0\u5f15\u5bfc\u7684\u65f6\u5019\u4f1a\u81ea\u52a8\u4fee\u6539\u4e0b\u9762\u7684TCP/IP\u53c2\u6570:
echo 256960 > /proc/sys/net/core/rmem_default
echo 256960 > /proc/sys/net/core/rmem_max
echo 256960 > /proc/sys/net/core/wmem_default
echo 256960 > /proc/sys/net/core/wmem_max
echo 0 > /proc/sys/net/ipv4/tcp_timestamps
echo 1 > /proc/sys/net/ipv4/tcp_sack
echo 1 > /proc/sys/net/ipv4/tcp_window_scaling
TCP/IP\u53c2\u6570\u90fd\u662f\u81ea\u89e3\u91ca\u7684\uff0c TCP\u7a97\u53e3\u5927\u5c0f\u8bbe\u7f6e\u4e3a256960\uff0c \u7981\u6b62TCP\u7684\u65f6\u95f4\u6233(\u53d6\u6d88\u5728\u6bcf\u4e2a\u6570\u636e\u5305\u7684\u5934\u4e2d\u589e\u52a012\u5b57\u8282), \u652f\u6301\u66f4\u5927\u7684TCP\u7a97\u53e3\u548cTCP\u6709\u9009\u62e9\u7684\u5e94\u7b54\u3002
\u4e0a\u9762\u6570\u503c\u7684\u8bbe\u5b9a\u662f\u6839\u636e\u4e92\u8fde\u7f51\u8fde\u63a5\u548c\u6700\u5927\u5e26\u5bbd/\u5ef6\u8fdf\u7387\u6765\u51b3\u5b9a.
\u6ce8: \u4e0a\u9762\u5b9e\u4f8b\u4e2d\u7684\u6570\u503c\u53ef\u4ee5\u5b9e\u9645\u5e94\u7528, \u4f46\u5b83\u53ea\u5305\u542b\u4e86\u4e00\u90e8\u5206\u53c2\u6570.
\u53e6\u5916\u4e00\u4e2a\u65b9\u6cd5: \u4f7f\u7528 /etc/sysctl.conf \u5728\u7cfb\u7edf\u542f\u52a8\u65f6\u5c06\u53c2\u6570\u914d\u7f6e\u6210\u60a8\u6240\u8bbe\u7f6e\u7684\u503c:
net.core.rmem_default = 256960
net.core.rmem_max = 256960
net.core.wmem_default = 256960
net.core.wmem_max = 256960
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack =1
net.ipv4.tcp_window_scaling = 1
----------------------------------------------------------------
/proc/sys/fs/super-max
\u8be5\u6587\u4ef6\u6307\u5b9a\u8d85\u7ea7\u5757\u5904\u7406\u7a0b\u5e8f\u7684\u6700\u5927\u6570\u76ee\u3002\u6302\u88c5\u7684\u4efb\u4f55\u6587\u4ef6\u7cfb\u7edf\u9700\u8981\u4f7f\u7528\u8d85\u7ea7\u5757\uff0c\u6240\u4ee5\u5982\u679c\u6302\u88c5\u4e86\u5927\u91cf\u6587\u4ef6\u7cfb\u7edf\uff0c\u5219\u53ef\u80fd\u4f1a\u7528\u5c3d\u8d85\u7ea7\u5757\u5904\u7406\u7a0b\u5e8f\u3002
\u7f3a\u7701\u8bbe\u7f6e\uff1a256
/proc/sys/fs/super-nr
\u8be5\u6587\u4ef6\u663e\u793a\u5f53\u524d\u5df2\u5206\u914d\u8d85\u7ea7\u5757\u7684\u6570\u76ee\u3002\u8be5\u6587\u4ef6\u662f\u53ea\u8bfb\u7684\uff0c\u4ec5\u7528\u4e8e\u663e\u793a\u4fe1\u606f\u3002
/proc/sys/kernel
/proc/sys/kernel/acct
\u8be5\u6587\u4ef6\u6709\u4e09\u4e2a\u53ef\u914d\u7f6e\u503c\uff0c\u6839\u636e\u5305\u542b\u65e5\u5fd7\u7684\u6587\u4ef6\u7cfb\u7edf\u4e0a\u53ef\u7528\u7a7a\u95f4\u7684\u6570\u91cf(\u4ee5\u767e\u5206\u6bd4\u8868\u793a)\uff0c\u8fd9\u4e9b\u503c\u63a7\u5236\u4f55\u65f6\u5f00\u59cb\u8fdb\u884c\u8fdb\u7a0b\u8bb0\u5e10\uff1a
\u5982\u679c\u53ef\u7528\u7a7a\u95f4\u4f4e\u4e8e\u8fd9\u4e2a\u767e\u5206\u6bd4\u503c\uff0c\u5219\u505c\u6b62\u8fdb\u7a0b\u8bb0\u5e10
\u5982\u679c\u53ef\u7528\u7a7a\u95f4\u9ad8\u4e8e\u8fd9\u4e2a\u767e\u5206\u6bd4\u503c\uff0c\u5219\u5f00\u59cb\u8fdb\u7a0b\u8bb0\u5e10
\u68c0\u67e5\u4e0a\u9762\u4e24\u4e2a\u503c\u7684\u9891\u7387(\u4ee5\u79d2\u4e3a\u5355\u4f4d)
\u8981\u66f4\u6539\u8fd9\u4e2a\u6587\u4ef6\u7684\u67d0\u4e2a\u503c\uff0c\u5e94\u8be5\u56de\u9001\u7528\u7a7a\u683c\u5206\u9694\u5f00\u7684\u4e00\u4e32\u6570\u5b57\u3002
\u7f3a\u7701\u8bbe\u7f6e\uff1a2 4 30
\u5982\u679c\u5305\u542b\u65e5\u5fd7\u7684\u6587\u4ef6\u7cfb\u7edf\u4e0a\u53ea\u6709\u5c11\u4e8e 2% \u7684\u53ef\u7528\u7a7a\u95f4\uff0c\u5219\u8fd9\u4e9b\u503c\u4f1a\u4f7f\u8bb0\u5e10\u505c\u6b62\uff0c\u5982\u679c\u6709 4% \u6216\u66f4\u591a\u53ef\u7528\u7a7a\u95f4\uff0c\u5219\u518d\u6b21\u542f\u52a8\u8bb0\u5e10\u3002\u6bcf 30 \u79d2\u505a\u4e00\u6b21\u68c0\u67e5\u3002
\u8981\u770b\u4f60\u600e\u4e48\u7528\u5427\uff0c\u7528\u4f5cshell\u547d\u4ee4\u53c2\u6570\uff0c\u80af\u5b9a\u6709\u9650\u5236\u554a
getconf ARG_MAX
\u6216\u8005
xargs --show-limits
\u67e5\u770b\u4f60\u7684\u7cfb\u7edf\u7684\u9650\u5236
getconf ARG_MAX
代码编程可通过：
#include <stdio.h>
#include <unistd.h>
int main()
{
long max=sysconf(_SC_ARG_MAX);
printf("max[%ld]\n", max);
return 0;
}
getconf ARG_MAX
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