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authorMark McLoughlin <markmc@redhat.com>2009-06-18 18:21:34 +0100
committerAnthony Liguori <aliguori@us.ibm.com>2009-06-22 10:15:30 -0500
commit0df0ff6de70393680cea81ad696d9d74b75f88da (patch)
tree4e6c037340aa0c7d3430dae6bc169a4c49c589b1 /hw/shix.c
parent4a77b25e2af0ccfa637c963f64a01468edcf94ac (diff)
net: add '-net tap,sndbuf=nbytes'
2.6.30 adds a new TUNSETSNDBUF ioctl() which allows a send buffer limit for the tap device to be specified. When this limit is reached, a tap write() will return EAGAIN and poll() will indicate the fd isn't writable. This allows people to tune their setups so as to avoid e.g. UDP packet loss when the sending application in the guest out-runs the NIC in the host. There is no obviously sensible default setting - a suitable value depends mostly on the capabilities of the physical NIC through which the packets are being sent. Also, note that when using a bridge with netfilter enabled, we currently never get EAGAIN because netfilter causes the packet to be immediately orphaned. Set /proc/sys/net/bridge/bridge nf-call-iptables to zero to disable this behaviour. Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'hw/shix.c')
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