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| author | Ashish Chaudhari <ashish@ettus.com> | 2014-06-27 10:50:51 -0700 |
|---|---|---|
| committer | Ashish Chaudhari <ashish@ettus.com> | 2014-06-27 10:50:51 -0700 |
| commit | 1bca847406dc4829fd6cfe0ba8bc49b83d25e1ee (patch) | |
| tree | 0c248544b07d0f05d547526d035b932a4867e9d4 | |
| parent | 96c30a11f2924fcb5f914f2922506fe6cfdd93ec (diff) | |
| download | uhd-1bca847406dc4829fd6cfe0ba8bc49b83d25e1ee.tar.gz uhd-1bca847406dc4829fd6cfe0ba8bc49b83d25e1ee.tar.bz2 uhd-1bca847406dc4829fd6cfe0ba8bc49b83d25e1ee.zip | |
x300: Bugfix for overflows on PCIe at 200MS/s
| -rw-r--r-- | host/lib/usrp/x300/x300_impl.cpp | 4 | ||||
| -rw-r--r-- | host/lib/usrp/x300/x300_impl.hpp | 6 |
2 files changed, 7 insertions, 3 deletions
diff --git a/host/lib/usrp/x300/x300_impl.cpp b/host/lib/usrp/x300/x300_impl.cpp index 2c291f422..a624ebf6b 100644 --- a/host/lib/usrp/x300/x300_impl.cpp +++ b/host/lib/usrp/x300/x300_impl.cpp @@ -1129,12 +1129,12 @@ x300_impl::both_xports_t x300_impl::make_transport( if (mb.xport_path == "nirio") { default_buff_args.send_frame_size = (prefix == X300_RADIO_DEST_PREFIX_TX) - ? X300_PCIE_DATA_FRAME_SIZE + ? X300_PCIE_TX_DATA_FRAME_SIZE : X300_PCIE_MSG_FRAME_SIZE; default_buff_args.recv_frame_size = (prefix == X300_RADIO_DEST_PREFIX_RX) - ? X300_PCIE_DATA_FRAME_SIZE + ? X300_PCIE_RX_DATA_FRAME_SIZE : X300_PCIE_MSG_FRAME_SIZE; default_buff_args.num_send_frames = diff --git a/host/lib/usrp/x300/x300_impl.hpp b/host/lib/usrp/x300/x300_impl.hpp index 80f3e8faa..27f20fbd9 100644 --- a/host/lib/usrp/x300/x300_impl.hpp +++ b/host/lib/usrp/x300/x300_impl.hpp @@ -63,7 +63,11 @@ static const size_t X300_RX_SW_BUFF_SIZE_ETH_MACOS = 0x100000; //1Mib static const double X300_RX_SW_BUFF_FULL_FACTOR = 0.90; //Buffer should ideally be 90% full. static const size_t X300_RX_FC_REQUEST_FREQ = 32; //per flow-control window -static const size_t X300_PCIE_DATA_FRAME_SIZE = 8192; //bytes +//The FIFO closest to the DMA controller is 1023 elements deep for RX and 1029 elements deep for TX +//where an element is 8 bytes. For best throughput ensure that the data frame fits in these buffers. +//Also ensure that the kernel has enough frames to hold buffered TX and RX data +static const size_t X300_PCIE_RX_DATA_FRAME_SIZE = 8184; //bytes +static const size_t X300_PCIE_TX_DATA_FRAME_SIZE = 8192; //bytes static const size_t X300_PCIE_DATA_NUM_FRAMES = 2048; static const size_t X300_PCIE_MSG_FRAME_SIZE = 256; //bytes static const size_t X300_PCIE_MSG_NUM_FRAMES = 32; |