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RFsim: don't shell out to improve kernel socket buffer sizes, teach the user instead

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A later commit in this series adds performance tuning tips, which
includes the call made in RFsim until this commit.
This commit is contained in:
Robert Schmidt
2024-06-03 14:00:41 +02:00
parent 105368a437
commit 6a12784872
2 changed files with 16 additions and 38 deletions
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radio/rfsimulator/README.md
+15
View File
@@ -174,3 +174,18 @@ To successfully establish a connection with such a GEO satellite channel, both g
# Caveats
There are issues in power control: txgain/rxgain setting is not supported.
# How to improve performance
Most importantly, note that the RFsimulator is not designed to be as performant
as possible, nor is it designed to run close to real-time. It might run faster
or slower than realtime, depending on CPU, and by design, as this allows to
stop the entire system for inspection, e.g., using a debugger.
In order to improve performance, you can modify the radio parameters of the gNB
to reduce the amount of transported samples:
- Use option `-E` for three-quarter sampling (also to be done on the UE-side!)
- Prefer smaller cell bandwidths
A possible, unimplemented optimization would be to compress samples.
radio/rfsimulator/simulator.c
+1 -38
View File
@@ -86,8 +86,7 @@
//
// #define MAX_FD_RFSIMU FD_SETSIZE
#define MAX_FD_RFSIMU 250
#define SYSCTL_MEM_VALUE 134217728 // Kernel network buffer size
#define SEND_BUFF_SIZE SYSCTL_MEM_VALUE // Socket buffer size
#define SEND_BUFF_SIZE 100000000 // Socket buffer size
// Simulator role
typedef enum { SIMU_ROLE_SERVER = 1, SIMU_ROLE_CLIENT } simuRole;
@@ -540,40 +539,6 @@ static int rfsimu_vtime_cmd(char *buff, int debug, telnet_printfunc_t prnt, void
return CMDSTATUS_FOUND;
}
static void customNetForPerf()
{
int res = 0;
char sysctlmem[256];
memset(sysctlmem, 0, 256);
sprintf(sysctlmem, "/sbin/sysctl -n -e -q -w net.core.rmem_default=%d", SYSCTL_MEM_VALUE);
LOG_W(HW, "running command \"%s\" to increase RFsim performance\n", sysctlmem);
res = system(sysctlmem);
if (res != 0) {
LOG_W(HW, "Cannot set net.core.rmem_default to %d\n", SYSCTL_MEM_VALUE);
}
memset(sysctlmem, 0, 256);
sprintf(sysctlmem, "/sbin/sysctl -n -e -q -w net.core.rmem_max=%d", SYSCTL_MEM_VALUE);
LOG_W(HW, "running command \"%s\" to increase RFsim performance\n", sysctlmem);
res = system(sysctlmem);
if (res != 0) {
LOG_W(HW, "Cannot set net.core.rmem_max to %d\n", SYSCTL_MEM_VALUE);
}
memset(sysctlmem, 0, 256);
sprintf(sysctlmem, "/sbin/sysctl -n -e -q -w net.core.wmem_default=%d", SYSCTL_MEM_VALUE);
LOG_W(HW, "running command \"%s\" to increase RFsim performance\n", sysctlmem);
res = system(sysctlmem);
if (res != 0) {
LOG_W(HW, "Cannot set net.core.wmem_default to %d\n", SYSCTL_MEM_VALUE);
}
memset(sysctlmem, 0, 256);
sprintf(sysctlmem, "/sbin/sysctl -n -e -q -w net.core.wmem_max=%d", SYSCTL_MEM_VALUE);
LOG_W(HW, "running command \"%s\" to increase RFsim performance\n", sysctlmem);
res = system(sysctlmem);
if (res != 0) {
LOG_W(HW, "Cannot set net.core.wmem_max to %d\n", SYSCTL_MEM_VALUE);
}
}
static int startServer(openair0_device *device) {
rfsimulator_state_t *t = (rfsimulator_state_t *) device->priv;
t->role = SIMU_ROLE_SERVER;
@@ -588,7 +553,6 @@ static int startServer(openair0_device *device) {
return -1;
}
struct sockaddr_in addr = {.sin_family = AF_INET, .sin_port = htons(t->port), .sin_addr = {.s_addr = INADDR_ANY}};
customNetForPerf();
int rc = bind(t->listen_sock, (struct sockaddr *)&addr, sizeof(addr));
if (rc < 0) {
LOG_E(HW, "bind() failed, errno(%d)\n", errno);
@@ -620,7 +584,6 @@ static int startClient(openair0_device *device) {
addr.sin_addr.s_addr = inet_addr(t->ip);
bool connected=false;
customNetForPerf();
while(!connected) {
LOG_I(HW, "Trying to connect to %s:%d\n", t->ip, t->port);