Hi,
I am trying to increase the buffer size in tx.
According to https://files.ettus.com/manual/page_transport.html,
it seems that we can change the default send_buff_size by specifying value in
device arguments. I tried the following configuration:
uhd::usrp::multi_usrp::make('addr=192.168.12.2, second_addr=192.168.13.2,
mgmt_addr=192.168.10.16, master_clock_rate=245.76e6, type=n3xx,
send_buff_size=33554432')
But this didn't have any impact. I measured that the actual buffer is always
about ~1MB.
Then in UHD library, I find the following limit:
static const size_t MAX_BUFF_SIZE_ETH_MACOS = 0x100000; // 1Mib
if (link_params.send_buff_size > MAX_BUFF_SIZE_ETH_MACOS) {
link_params.send_buff_size = MAX_BUFF_SIZE_ETH_MACOS; }
33554432 > 1048576 (1Mib), so this may be why the above config didn't work.
Then I tried the following configuration:
uhd::usrp::multi_usrp::make('addr=192.168.12.2,second_addr=192.168.13.2,mgmt_addr=192.168.10.16,master_clock_rate=245.76e6,type=n3xx,send_buff_size=524288')
This one didn't have any impact either.So, am I wrong in configuring
send_buff_size in this way? what is the correct way?
1M buffer size is too small for my application. I am using sampling rate
245.76MHz. This buffer can only save data up to 0.5ms. I want to allocate a
bigger buffer to achieve better reliability.
Thanks for any comment.
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