diff options
| author | Eric Blossom | 2010-09-29 12:41:07 -0700 |
|---|---|---|
| committer | Eric Blossom | 2010-09-29 12:41:07 -0700 |
| commit | 7fad5c4fe2f5ee6b9fa7403fa0b23eb154001798 (patch) | |
| tree | b441e6b9215f0d645719bf2d35d71f89563ad67f /vrt/lib | |
| parent | c7219d7aced26483ffe9c935fd1033dc3803891b (diff) | |
| download | gnuradio-7fad5c4fe2f5ee6b9fa7403fa0b23eb154001798.tar.gz gnuradio-7fad5c4fe2f5ee6b9fa7403fa0b23eb154001798.tar.bz2 gnuradio-7fad5c4fe2f5ee6b9fa7403fa0b23eb154001798.zip | |
16-byte align receive buffer to facilitate SIMD use
Diffstat (limited to 'vrt/lib')
| -rw-r--r-- | vrt/lib/socket_rx_buffer.cc | 12 | ||||
| -rw-r--r-- | vrt/lib/socket_rx_buffer.h | 1 |
2 files changed, 7 insertions, 6 deletions
diff --git a/vrt/lib/socket_rx_buffer.cc b/vrt/lib/socket_rx_buffer.cc index 87c36375c..5212af432 100644 --- a/vrt/lib/socket_rx_buffer.cc +++ b/vrt/lib/socket_rx_buffer.cc @@ -43,12 +43,11 @@ #define DEFAULT_MEM_SIZE 62.5e6 // ~0.5s @ 125 MB/s #define MAX_MEM_SIZE 1000e6 // ~10.00s @ 100 MB/s. - +#define RX_BUF_ALIGNMENT 16 // 16-byte aligned for SIMD (must be power-of-2) namespace vrt { const unsigned int socket_rx_buffer::MAX_PKTLEN = 8192; - const unsigned int socket_rx_buffer::MIN_PKTLEN = 64; socket_rx_buffer::socket_rx_buffer(int socket_fd, size_t rx_bufsize) : d_fd(socket_fd) @@ -111,11 +110,14 @@ namespace vrt { socket_rx_buffer::result socket_rx_buffer::rx_frames(data_handler *f, int timeout_in_ms) { - unsigned char buf[MAX_PKTLEN]; + unsigned char unaligned[MAX_PKTLEN + RX_BUF_ALIGNMENT]; + unsigned char *buf = (unsigned char *) + (((intptr_t)unaligned + RX_BUF_ALIGNMENT) & -RX_BUF_ALIGNMENT); + bool dont_wait = timeout_in_ms == 0; // FIXME treating timeout as 0 or inf int flags = dont_wait ? MSG_DONTWAIT : 0; - ssize_t rr = recv(d_fd, buf, sizeof(buf), flags); + ssize_t rr = recv(d_fd, buf, MAX_PKTLEN, flags); if (rr == -1){ // error? if (errno == EAGAIN){ // non-blocking, nothing there return EB_WOULD_BLOCK; @@ -133,7 +135,7 @@ namespace vrt { // Now do as many as we can without blocking while (1){ - rr = recv(d_fd, buf, sizeof(buf), MSG_DONTWAIT); + rr = recv(d_fd, buf, MAX_PKTLEN, MSG_DONTWAIT); if (rr == -1){ // error? if (errno == EAGAIN) // non-blocking, nothing there return EB_OK; // return OK; we've processed >= 1 packets diff --git a/vrt/lib/socket_rx_buffer.h b/vrt/lib/socket_rx_buffer.h index 146fe97fe..ef80fac43 100644 --- a/vrt/lib/socket_rx_buffer.h +++ b/vrt/lib/socket_rx_buffer.h @@ -55,7 +55,6 @@ namespace vrt { }; static const unsigned int MAX_PKTLEN; - static const unsigned int MIN_PKTLEN; /*! * \param socket_fd file descriptor that corresponds to a socket |