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What's the default socket buffer size of linux? Is there any command to see it?
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default The default size of the send buffer for a TCP socket. This value overwrites the initial default buffer size from the generic global /proc/sys/net/core/wmem_default defined for all protocols. The default value is 16 kB.
You can try ioctl . FIONREAD tells you how many bytes are immediately readable. If this is the same as the buffer size (which you might be able to retrieve and/or set with another icotl call), then the buffer is full.
The socket buffer is the structure used to address and manage a packet over the entire time this packet is being processed in the kernel.
Change the following set of parameters as needed: /proc/sys/net/core/rmem_default > recv > 124928 > changed to 512000. /proc/sys/net/core/wmem_default > send > 124928 > changed to 512000. /proc/sys/net/core/rmem_max > 124928 > changed to 512000.
If you want see your buffer size in terminal, you can take a look at:
/proc/sys/net/ipv4/tcp_rmem (for read) /proc/sys/net/ipv4/tcp_wmem (for write)They contain three numbers, which are minimum, default and maximum memory size values (in byte), respectively.
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For getting the buffer size in c/c++ program the following is the flow
int n; unsigned int m = sizeof(n); int fdsocket; fdsocket = socket(AF_INET,SOCK_DGRAM,IPPROTO_UDP); // example getsockopt(fdsocket,SOL_SOCKET,SO_RCVBUF,(void *)&n, &m); // now the variable n will have the socket size If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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