1. 05 7月, 2012 10 次提交
  2. 04 7月, 2012 4 次提交
  3. 03 7月, 2012 2 次提交
  4. 02 7月, 2012 3 次提交
  5. 30 6月, 2012 3 次提交
  6. 29 6月, 2012 3 次提交
    • D
      Remove sub-mounts under /dev when starting an LXC container · 5bb83236
      Daniel P. Berrange 提交于
      Since we are mounting a new /dev in the container, we must
      remove any sub-mounts like /dev/shm, /dev/mqueue, etc,
      otherwise they'll be recorded in /proc/mounts, but not be
      accessible to applications.
      5bb83236
    • E
      Fix vm's outbound traffic control problem · 0ac3baee
      Eiichi Tsukata 提交于
      Hello,
      
      This is a patch to fix vm's outbound traffic control problem.
      
      Currently, vm's outbound traffic control by libvirt doesn't go well.
      This problem was previously discussed at libvir-list ML, however
      it seems that there isn't still any answer to the problem.
      http://www.redhat.com/archives/libvir-list/2011-August/msg00333.html
      
      I measured Guest(with virtio-net) to Host TCP throughput with the
      command "netperf -H".
      Here are the outbound QoS parameters and the results.
      
      outbound average rate[kilobytes/s] : Guest to Host throughput[Mbit/s]
      ======================================================================
      1024  (8Mbit/s)                    : 4.56
      2048  (16Mbit/s)                   : 3.29
      4096  (32Mbit/s)                   : 3.35
      8192  (64Mbit/s)                   : 3.95
      16384 (128Mbit/s)                  : 4.08
      32768 (256Mbit/s)                  : 3.94
      65536 (512Mbit/s)                  : 3.23
      
      The outbound traffic goes down unreasonably and is even not controled.
      
      The cause of this problem is too large mtu value in "tc filter" command run by
      libvirt. The command uses burst value to set mtu and the burst is equal to
      average rate value if it's not set. This value is too large. For example
      if the average rate is set to 1024 kilobytes/s, the mtu value is set to 1024
      kilobytes. That's too large compared to the size of network packets.
      Here libvirt applies tc ingress filter to Host's vnet(tun) device.
      Tc ingress filter is implemented with TBF(Token Buckets Filter) algorithm. TBF
      uses mtu value to calculate the amount of token consumed by each packet. With too
      large mtu value, the token consumption rate is set too large. This leads to
      token starvation and deterioration of TCP throughput.
      
      Then, should we use the default mtu value 2 kilobytes?
      The anser is No, because Guest with virtio-net device uses 65536 bytes
      as mtu to transmit packets to Host, and the tc filter with the default mtu
      value 2k drops packets whose size is larger than 2k. So, the most packets
      is droped and again leads to deterioration of TCP throughput.
      
      The appropriate mtu value is 65536 bytes which is equal to the maximum value
      of network interface device defined in <linux/netdevice.h>. The value is
      not so large that it causes token starvation and not so small that it
      drops most packets.
      Therefore this patch set the mtu value to 64kb(== 65535 bytes).
      
      Again, here are the outbound QoS parameters and the TCP throughput with
      the libvirt patched.
      
      outbound average rate[kilobytes/s] : Guest to Host throughput[Mbit/s]
      ======================================================================
      1024  (8Mbit/s)                    : 8.22
      2048  (16Mbit/s)                   : 16.42
      4096  (32Mbit/s)                   : 32.93
      8192  (64Mbit/s)                   : 66.85
      16384 (128Mbit/s)                  : 133.88
      32768 (256Mbit/s)                  : 271.01
      65536 (512Mbit/s)                  : 547.32
      
      The outbound traffic conforms to the given limit.
      
      Thank you,
      Signed-off-by: NEiichi Tsukata <eiichi.tsukata.xh@hitachi.com>
      0ac3baee
    • P
      network_conf: Don't free uninitialized pointers while parsing DNS SRV · 96ebb4fe
      Peter Krempa 提交于
      If the user specified invalid protocol type in a network's SRV record
      the error path ended up in freeing uninitialized pointers causing a
      daemon crash.
      
      *network_conf.c: virNetworkDNSSrvDefParseXML(): initialize local
                                                      variables
      96ebb4fe
  7. 28 6月, 2012 5 次提交
  8. 27 6月, 2012 6 次提交
  9. 25 6月, 2012 4 次提交