>> А если памяти ядру на
>>сеть добавить, мегабайт 500? Может сгладяться пики?
>
>как конкретно это сделать??
>если не секрет Вы сначала проверте в этом ли проблема с помощью, netstat -m, параметра два в sysctl
kern.ipc.nmbclusters и kern.ipc.nsfbufs.
The NMBCLUSTERS kernel configuration option dictates the amount of network Mbufs available to the system. A heavily-trafficked server with a low number of Mbufs will hinder FreeBSD's ability. Each cluster represents approximately 2 K of memory, so a value of 1024 represents 2 megabytes of kernel memory reserved for network buffers. A simple calculation can be done to figure out how many are needed. If you have a web server which maxes out at 1000 simultaneous connections, and each connection eats a 16 K receive and 16 K send buffer, you need approximately 32 MB worth of network buffers to cover the web server. A good rule of thumb is to multiply by 2, so 2x32 MB / 2 KB = 64 MB / 2 kB = 32768. We recommend values between 4096 and 32768 for machines with greater amounts of memory. Under no circumstances should you specify an arbitrarily high value for this parameter as it could lead to a boot time crash. The -m option to netstat(1) may be used to observe network cluster use.
kern.ipc.nmbclusters loader tunable should be used to tune this at boot time. Only older versions of FreeBSD will require you to use the NMBCLUSTERS kernel config(8) option.
For busy servers that make extensive use of the sendfile(2) system call, it may be necessary to increase the number of sendfile(2) buffers via the NSFBUFS kernel configuration option or by setting its value in /boot/loader.conf (see loader(8) for details). A common indicator that this parameter needs to be adjusted is when processes are seen in the sfbufa state. The sysctl variable kern.ipc.nsfbufs is a read-only glimpse at the kernel configured variable. This parameter nominally scales with kern.maxusers, however it may be necessary to tune accordingly.
Important: Even though a socket has been marked as non-blocking, calling sendfile(2) on the non-blocking socket may result in the sendfile(2) call blocking until enough struct sf_buf's are made available.
