Looking at source the default size if you don't call
pcap_set_buffer_size is *massively* larger than the PCAP_BUFFERSIZE
constant libvirt has defined:
$ grep -r 'buffer_size =' *
pcap.c: p->opt.buffer_size = 0; /* use the platform's default */
pcap.c: p->opt.buffer_size = buffer_size;
pcap-linux.c: if (handle->opt.buffer_size == 0) {
pcap-linux.c: handle->opt.buffer_size = 2*1024*1024;
pcap-win32.c: if (p->opt.buffer_size == 0)
pcap-win32.c: p->opt.buffer_size =
WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
$ grep -r WIN32_DEFAULT_KERNEL_BUFFER_SIZE *
pcap-win32.c:#define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000
pcap-win32.c: * WIN32_DEFAULT_KERNEL_BUFFER_SIZE.
pcap-win32.c: p->opt.buffer_size =
WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
So libpcap uses 2 MB on Linux, or 1 MB on Windows.
We need to consider what maximum oldest libpcap we support to support
is, to decide whether we can safely drop the pcap_Set_buffer_size call,
vs increase its value.
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https://bugs.launchpad.net/bugs/1758037
Title:
LTC Test- Ubuntu18.04: Starting the guest with network filter defined
will fail with "cause is unknown".
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