[Qemu-devel] [4341] qemu: generate signals on tap I/O

[Aurelien Jarno]

Revision: 4341
          http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=4341
Author:   aurel32
Date:     2008-05-05 21:26:43 +0000 (Mon, 05 May 2008)

Log Message:
-----------
qemu: generate signals on tap I/O

Currently tap does not generate signals on I/O; this causes
network latency to be dependent on the timer tick (1ms without
dyntick, guest dependent with dyntick).  By generating a signal
on I/O, we can inform the guest immediately that a packet has
arrived.

Signed-off-by: Aurelien Jarno <address@hidden>

Modified Paths:
--------------
    trunk/vl.c

Modified: trunk/vl.c
===================================================================
--- trunk/vl.c  2008-05-05 21:26:31 UTC (rev 4340)
+++ trunk/vl.c  2008-05-05 21:26:43 UTC (rev 4341)
@@ -4030,6 +4030,7 @@
     if (!s)
         return NULL;
     s->fd = fd;
+    enable_sigio_timer(fd);
     s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
     qemu_set_fd_handler(s->fd, tap_send, NULL, s);
     snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);