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@4341 c046a42c-6fe2-441c-8c8c-71466251a162
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vl.c
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vl.c
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@ -4030,6 +4030,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
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if (!s)
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return NULL;
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s->fd = fd;
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enable_sigio_timer(fd);
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s->vc = qemu_new_vlan_client(vlan, tap_receive, NULL, s);
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qemu_set_fd_handler(s->fd, tap_send, NULL, s);
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snprintf(s->vc->info_str, sizeof(s->vc->info_str), "tap: fd=%d", fd);
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