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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
This commit is contained in:
aurel32 2008-11-11 13:30:53 +00:00
parent 7aa763c72e
commit 3587f82a68
2 changed files with 4 additions and 1 deletions
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3
net.c
View File

@ -622,6 +622,8 @@ static void tap_send(void *opaque)
/* fd support */ /* fd support */
void enable_sigio_timer(int fd);
static TAPState *net_tap_fd_init(VLANState *vlan, int fd) static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
{ {
TAPState *s; TAPState *s;
@ -630,6 +632,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
if (!s) if (!s)
return NULL; return NULL;
s->fd = fd; s->fd = fd;
enable_sigio_timer(fd);
s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s); s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
qemu_set_fd_handler(s->fd, tap_send, 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); snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);

2
vl.c
View File

@ -1403,7 +1403,7 @@ static int fcntl_setfl(int fd, int flag)
#define RTC_FREQ 1024 #define RTC_FREQ 1024
static void enable_sigio_timer(int fd) void enable_sigio_timer(int fd)
{ {
struct sigaction act; struct sigaction act;