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  1. 01 10月, 2009 1 次提交
  3. 12 9月, 2009 1 次提交
    • B
      Fix sys-queue.h conflict for good · 72cf2d4f
      由 Blue Swirl 提交于 
      Problem: Our file sys-queue.h is a copy of the BSD file, but there are
some additions and it's not entirely compatible. Because of that, there have
been conflicts with system headers on BSD systems. Some hacks have been
introduced in the commits 15cc9235,
f40d7537,
96555a96 and
3990d09a but the fixes were fragile.

Solution: Avoid the conflict entirely by renaming the functions and the
file. Revert the previous hacks.
Signed-off-by: NBlue Swirl <blauwirbel@gmail.com>
      72cf2d4f
  5. 11 9月, 2009 1 次提交
  7. 05 9月, 2009 1 次提交
  9. 04 9月, 2009 3 次提交
  11. 24 8月, 2009 1 次提交
  13. 11 8月, 2009 1 次提交
  15. 28 7月, 2009 3 次提交
  17. 27 7月, 2009 1 次提交
  19. 17 7月, 2009 1 次提交
  21. 16 7月, 2009 1 次提交
  23. 10 7月, 2009 2 次提交
    • M
      Don't abort if TUNSETSNDBUF fails where no sndbuf= arg is supplied · d026fb6d
      由 Mark McLoughlin 提交于 
      If no tap,sndbuf= arg is supplied, we use a default value. If
TUNSETSNDBUF fails in this case, we should not abort.
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      d026fb6d
    • M
      net: set a default value for sndbuf= · fc5b81d1
      由 Mark McLoughlin 提交于 
      On reflection, perhaps it does make sense to set a default value for
the sndbuf= tap parameter.

For best effect, sndbuf= should be set to just below the capacity of
the physical NIC.

Setting it higher will cause packets to be dropped before the limit
is hit. Setting it much lower will not cause any problems unless
you set it low enough such that the guest cannot queue up new packets
before the NIC has emptied its queue.

In Linux, txqueuelen=1000 by default for ethernet NICs. Given a 1500
byte MTU, 1Mb is a good choice for sndbuf.

If it turns out that txqueuelen is actually much lower than this, then
sndbuf is essentially disabled. In the event that txqueuelen is much
higher, it's unlikely that the NIC will be able to empty a 1Mb queue.

Thanks to Herbert Xu for this logic.
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Cc: Herbert Xu <herbert.xu@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      fc5b81d1
  25. 02 7月, 2009 1 次提交
  27. 29 6月, 2009 19 次提交
  29. 24 6月, 2009 1 次提交
  31. 22 6月, 2009 2 次提交
    • M
      net: add packet length to NetPacketSent callback · 783527a9
      由 Mark McLoughlin 提交于 
      virtio-net needs this - for the same purpose that it currently uses the
return value from qemu_sendv_packet().
Signed-off-by: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      783527a9
    • M
      net: add '-net tap,sndbuf=nbytes' · 0df0ff6d
      由 Mark McLoughlin 提交于 
      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: NMark McLoughlin <markmc@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
      0df0ff6d