diff options
| -rw-r--r-- | trafgen.8 | 9 | ||||
| -rw-r--r-- | trafgen.c | 24 | ||||
| -rw-r--r-- | trafgen.zsh | 2 |
3 files changed, 32 insertions, 3 deletions
@@ -152,6 +152,15 @@ testing. .SS -u <uid>, --user <uid> resp. -g <gid>, --group <gid> After ring setup, drop privileges to a non-root user/group combination. .PP +.SS -H, --prio-high +Set this process as a high priority process in order to achieve a higher +scheduling rate resp. CPU time. This is however not the default setting, since +it could lead to starvation of other processes, for example low priority kernel +threads. +.PP +.SS -Q, --notouch-irq +Do not reassign the NIC's IRQ CPU affinity settings. +.PP .SS -V, --verbose Let trafgen be more talkative and let it print the parsed configuration and some ring buffer statistics. @@ -80,7 +80,7 @@ size_t plen = 0; struct packet_dyn *packet_dyn = NULL; size_t dlen = 0; -static const char *short_options = "d:c:n:t:vJhS:rk:i:o:VRs:P:eE:pu:g:C"; +static const char *short_options = "d:c:n:t:vJhS:rk:i:o:VRs:P:eE:pu:g:CHQ"; static const struct option long_options[] = { {"dev", required_argument, NULL, 'd'}, {"out", required_argument, NULL, 'o'}, @@ -95,6 +95,8 @@ static const struct option long_options[] = { {"seed", required_argument, NULL, 'E'}, {"user", required_argument, NULL, 'u'}, {"group", required_argument, NULL, 'g'}, + {"prio-high", no_argument, NULL, 'H'}, + {"notouch-irq", no_argument, NULL, 'Q'}, {"jumbo-support", no_argument, NULL, 'J'}, {"no-cpu-stats", no_argument, NULL, 'C'}, {"cpp", no_argument, NULL, 'p'}, @@ -189,6 +191,8 @@ static void __noreturn help(void) " -E|--seed <uint> Manually set srand(3) seed\n" " -u|--user <userid> Drop privileges and change to userid\n" " -g|--group <groupid> Drop privileges and change to groupid\n" + " -H|--prio-high Make this high priority process\n" + " -Q|--notouch-irq Do not touch IRQ CPU affinity of NIC\n" " -V|--verbose Be more verbose\n" " -C|--no-cpu-stats Do not print CPU time statistics on exit\n" " -v|--version Show version and exit\n" @@ -880,6 +884,7 @@ static unsigned int generate_srand_seed(void) int main(int argc, char **argv) { bool slow = false, invoke_cpp = false, reseed = true, cpustats = true; + bool prio_high = false, set_irq_aff = true; int c, opt_index, vals[4] = {0}, irq; uint64_t gap = 0; unsigned int i, j; @@ -923,6 +928,12 @@ int main(int argc, char **argv) case 'o': ctx.device = xstrndup(optarg, IFNAMSIZ); break; + case 'H': + prio_high = true; + break; + case 'Q': + set_irq_aff = false; + break; case 'r': ctx.rand = true; break; @@ -1060,6 +1071,11 @@ int main(int argc, char **argv) register_signal(SIGHUP, signal_handler); register_signal_f(SIGALRM, timer_elapsed, SA_SIGINFO); + if (prio_high) { + set_proc_prio(-20); + set_sched_status(SCHED_FIFO, sched_get_priority_max(SCHED_FIFO)); + } + set_system_socket_memory(vals, array_size(vals)); xlockme(); @@ -1072,7 +1088,8 @@ int main(int argc, char **argv) } irq = device_irq_number(ctx.device); - device_set_irq_affinity_list(irq, 0, ctx.cpus - 1); + if (set_irq_aff) + device_set_irq_affinity_list(irq, 0, ctx.cpus - 1); stats = setup_shared_var(ctx.cpus); @@ -1128,7 +1145,8 @@ int main(int argc, char **argv) thread_out: xunlockme(); destroy_shared_var(stats, ctx.cpus); - device_restore_irq_affinity_list(); + if (set_irq_aff) + device_restore_irq_affinity_list(); free(ctx.device); free(ctx.device_trans); diff --git a/trafgen.zsh b/trafgen.zsh index 8a90381..adfd8ad 100644 --- a/trafgen.zsh +++ b/trafgen.zsh @@ -48,6 +48,8 @@ _arguments -s -S \ "(-E --seed)"{-E,--seed}"[Manually set srand(3) seed]" \ "(-u --user)"{-u,--user}"[Drop privileges and change to userid]:user:_user_info" \ "(-g --group)"{-g,--group}"[Drop privileges and change to groupid]:group:_group_info" \ + "(-H --prio-high)"{-H,--prio-high}"[Make this high priority process]" \ + "(-Q --notouch-irq)"{-Q,--notouch-irq}"[Do not touch IRQ CPU affinity of NIC]" \ "(-e --example)"{-e,--example}"[Show built-in packet config example]:" \ "(-V --verbose)"{-V,--verbose}"[Be more verbose]" \ "(-C --no-cpu-stats)"{-C,--no-cpu-stats}"[Do not print CPU time statistics on exit]" \ |