aix网络参数调整（AIX network parameter adjustment）.docVIP

aix网络参数调整（AIX network parameter adjustment） In AIX, to optimize the network performance from the following aspects: Network memory (network memory) adjustment Socket buffer (socket buffer) adjustment The network interface (network interface) parameter adjustment The network adapter (network adapter) on the send / receive queue adjustment Name resolution (name resolution) in order to find the. 1. network memory adjustment The parameter thewall value in AIX system defines a maximum number of physical memory can be used in the network buffer. But the thewall value in AIX5L is not modified, is identified in the system startup: 32- core - the thewall value of the minimum value of 1/2 and 1GB in physical memory, which is a maximum of 1GB. 64- core - the thewall value of the minimum value of 1/2 and 65GB in physical memory, which is a maximum of 65GB. If the netstat - M command shows the lack of MBUF - rewuests for mbufs denied value 0. # netstat -m 2434 mbufs in use: 2432 MBUF cluster pages in use 10336 Kbytes allocated to mbufs 0 requests for mbufs denied 0 calls to protocol drain routines 0 sockets not created because sockthresh was reached Kernel malloc statistics: 0 * * * * * * * * * * * * * * CPU By size inuse calls failed delayed free hiwat freed0 6484241800447200 12810388146300313 36017 ... Use the following method of adjustment of network memory: If A. is 32, and the memory is less than 2GB, increasing the system memory. If B. is 64, and the memory is less than 65GB, increasing the system memory. C. if possible, the 32 core to 64 core, increasing the system memory. Send / d. check socket receivebuffersize, to determine whether it can be reduced. E. is the MBUF leakage phenomenon. 2. socket buffer (socket buffer) adjustment Send buffer TCP Socket (send buffer) is used for temporary storage of data application area. The size of the buffer is composed of no tcp_sendspace to define the parameters in the user application using the system call setsoc