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qemu: generate signals on tap I/O

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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@4341 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-05-05 21:26:43 +00:00
parent b2eb849d4b
commit 603d3e79b2
1 changed files with 1 additions and 0 deletions
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1
vl.c
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@ -4030,6 +4030,7 @@ 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);