The patch below from KVM improves network transfers in a huge way. wget
in a MIPS target now gives me a transfer speed of up to 120 Mbits/s with
an e1000 emulated card.
kvm: 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: Avi Kivity <[EMAIL PROTECTED]>
---
vl.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/vl.c b/vl.c
index c87e8bc..fb01a46 100644
--- a/vl.c
+++ b/vl.c
@@ -3939,6 +3939,7 @@ static TAPState *net_tap_fd_init(VLANState *vlan, int fd)
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);
--
.''`. Aurelien Jarno | GPG: 1024D/F1BCDB73
: :' : Debian developer | Electrical Engineer
`. `' [EMAIL PROTECTED] | [EMAIL PROTECTED]
`- people.debian.org/~aurel32 | www.aurel32.net
