gwj / at91sam9263 · Commits

Commit 3587f82a683122e25da59e1e81150ffde313e54f

Authored by aurel32
1 parent 7aa763c7

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 <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5688 c046a42c-6fe2-441c-8c8c-71466251a162
Inline Side-by-side
Showing 2 changed files with 4 additions and 1 deletions
@@ -622,6 +622,8 @@ static void tap_send(void *opaque) @@ -622,6 +622,8 @@ static void tap_send(void *opaque)
622 622
623 /* fd support */ 623 /* fd support */
624 624
  625 +void enable_sigio_timer(int fd);
  626 +
625 static TAPState *net_tap_fd_init(VLANState *vlan, int fd) 627 static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
626 { 628 {
627 TAPState *s; 629 TAPState *s;
@@ -630,6 +632,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd) @@ -630,6 +632,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
630 if (!s) 632 if (!s)
631 return NULL; 633 return NULL;
632 s->fd = fd; 634 s->fd = fd;
  635 + enable_sigio_timer(fd);
633 s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s); 636 s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
634 qemu_set_fd_handler(s->fd, tap_send, NULL, s); 637 qemu_set_fd_handler(s->fd, tap_send, NULL, s);
635 snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd); 638 snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);
@@ -1403,7 +1403,7 @@ static int fcntl_setfl(int fd, int flag) @@ -1403,7 +1403,7 @@ static int fcntl_setfl(int fd, int flag)
1403 1403
1404 #define RTC_FREQ 1024 1404 #define RTC_FREQ 1024
1405 1405
1406 -static void enable_sigio_timer(int fd) 1406 +void enable_sigio_timer(int fd)
1407 { 1407 {
1408 struct sigaction act; 1408 struct sigaction act;
1409 1409