hi ALL，
I found app using VCL "epoll_wait" still occupy 70% cpu with "use_mq_eventfd" configuration even if very little traffic.
Then I investigate code in ldp_epoll_pwait, vls_epoll_wait is called with timeout equal to 0.
Then I have two questions:
1. What problems can "use_mq_eventfd" solve?
2.Any other way to decrease cpu usage?
Thanks!
code in ldp_epoll_pwait:
do
{
if (!ldpw->epoll_wait_vcl)
{
rv = vls_epoll_wait (ep_vlsh, events, maxevents, 0);
if (rv > 0)
{
ldpw->epoll_wait_vcl = 1;
goto done;
}
else if (rv < 0)
{
errno = -rv;
rv = -1;
goto done;
}
}
else
ldpw->epoll_wait_vcl = 0;
if (libc_epfd > 0)
{
rv = libc_epoll_pwait (libc_epfd, events, maxevents, 0, sigmask);
if (rv != 0)
goto done;
}
}
while ((timeout == -1) || (clib_time_now (&ldpw->clib_time) < max_time));
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