Windows 2008r2 2k8r2 udp

[HellMind Zmaster]

I'm using Proxmox 1.8.
Using windows 7 32/64 , vista, 2008r2 , (New winsock), in some applications I detect problems with udp packets, if I do tcpdum I dont see the sum = ok in some packets and apps starts killing udp sessions.

I tried virtio e1000 rtl8139 pcnet.
Also I tried disabling offloading and other tcpip tweaks.

But with Windows xp and server 2003 works fine.

What can I try?

I need windows vista+ for symblinks support (mklink).

 

[AndyL]

I noticed this here http://www.sevenforums.com/network-sharing/63331-tcp-udp-checksum-offloading.html and a possible test you could try here:
http://msdn.microsoft.com/en-us/library/ff571012.aspx.

It might be related?

 

[HellMind Zmaster]

I tried to disable task offloading with e1000 and virtio drivers and the problem persist

 

[HellMind Zmaster]

I think there are no working drivers for w2k8/7/vista working yet if using on kvm.

 

[e100]

I am using e1000 for network with default driver settings in 2008 R2.
My systems seem to be working ok.
I am using the 2.6.35 kernel, maybe that makes a difference?

Tested using PCattcp from one Windows 2008 R2 VM to another one running on a different proxmox server:
F:\>PCATTCP.exe -u -t x.x.x.x
PCAUSA Test TCP Utility V2.01.01.14 (IPv4/IPv6)
IP Version : IPv4
Started UDP Transmit Test 0...
UDP Transmit Test
Transmit : UDPv4 0.0.0.0 -> x.x.x.x:5001
Buffer Size : 8192; Alignment: 16384/0
Send Mode : Send Pattern; Number of Buffers: 2048
Statistics : UDPv4 0.0.0.0 -> x.x.x.x:5001
16777216 bytes in 0.300 real seconds = 54613.33 KB/sec +++
numCalls: 2050; msec/call: 0.150; calls/sec: 6833.333

# pveversion -v
pve-manager: 1.8-18 (pve-manager/1.8/6070)
running kernel: 2.6.35-1-pve
proxmox-ve-2.6.35: 1.8-11
pve-kernel-2.6.32-4-pve: 2.6.32-33
pve-kernel-2.6.35-1-pve: 2.6.35-11
qemu-server: 1.1-30
pve-firmware: 1.0-11
libpve-storage-perl: 1.0-17
vncterm: 0.9-2
vzctl: 3.0.28-1pve1
vzdump: 1.2-14
vzprocps: 2.0.11-2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.14.1-1
ksm-control-daemon: 1.0-6

 

[HellMind Zmaster]

I am using

Linux 2.6.32-4-pve #1 SMP Mon May 9 12:59:57 CEST 2011 x86_64

pveversion -v
pve-manager: 1.8-18 (pve-manager/1.8/6070)
running kernel: 2.6.32-4-pve
proxmox-ve-2.6.32: 1.8-33
pve-kernel-2.6.32-4-pve: 2.6.32-33
qemu-server: 1.1-30
pve-firmware: 1.0-11
libpve-storage-perl: 1.0-17
vncterm: 0.9-2
vzctl: 3.0.27-1pve1
vzdump: 1.2-13
vzprocps: 2.0.11-2
vzquota: 3.0.11-1
pve-qemu-kvm: 0.14.1-1
ksm-control-daemon: 1.0-6

How can I upgrade the kernel to test?.

I will test first PCATTCP

 

[e100]

http://pve.proxmox.com/wiki/Proxmox_VE_Kernel#How_to_install_2.6.35
OpenVZ is not supported with 2.6.35, only KVM

Might not be worth the hassle to try the Kernel if you are unable to reproduce issue with PCATTCP.

 

[HellMind Zmaster]

PCATTCP isn't good to reproduce, where it shows the checksum? how do you know if it works?

 

[HellMind Zmaster]

15:35:46.368752 IP (tos 0x0, ttl 119, id 5001, offset 0, flags [none], proto UDP (17), length 34) client.65121 > w2k8r2onproxmox.7242: [udp sum ok] UDP, length 6
15:35:46.376224 IP (tos 0x0, ttl 128, id 513, offset 0, flags [none], proto UDP (17), length 54) w2k8r2onproxmox.7242 > client.65121: [udp sum ok] UDP, length 26
15:35:46.385215 IP (tos 0x0, ttl 128, id 515, offset 0, flags [none], proto UDP (17), length 33) w2k8r2onproxmox.7242 > client.65121: [udp sum ok] UDP, length 5
15:35:46.462748 IP (tos 0x0, ttl 119, id 5007, offset 0, flags [none], proto UDP (17), length 64) client.65121 > w2k8r2onproxmox.7242: [udp sum ok] UDP, length 36
15:35:46.479482 IP (tos 0x0, ttl 119, id 5009, offset 0, flags [none], proto UDP (17), length 69) client.65121 > w2k8r2onproxmox.7242: [udp sum ok] UDP, length 41
15:35:46.579131 IP (tos 0x0, ttl 119, id 5013, offset 0, flags [none], proto UDP (17), length 75) client.65121 > w2k8r2onproxmox.7242: [udp sum ok] UDP, length 47
15:35:46.595130 IP (tos 0x0, ttl 119, id 5014, offset 0, flags [none], proto UDP (17), length 80) client.65121 > w2k8r2onproxmox.7242: [udp sum ok] UDP, length 52
15:35:46.694795 IP (tos 0x0, ttl 119, id 5019, offset 0, flags [none], proto UDP (17), length 85) client.65121 > w2k8r2onproxmox.7242: UDP, length 57
15:35:46.711070 IP (tos 0x0, ttl 119, id 5020, offset 0, flags [none], proto UDP (17), length 90) client.65121 > w2k8r2onproxmox.7242: UDP, length 62
15:35:46.816441 IP (tos 0x0, ttl 119, id 5025, offset 0, flags [none], proto UDP (17), length 95) client.65121 > w2k8r2onproxmox.7242: UDP, length 67
15:35:46.831359 IP (tos 0x0, ttl 119, id 5026, offset 0, flags [none], proto UDP (17), length 101) client.65121 > w2k8r2onproxmox.7242: UDP, length 73
15:35:46.933141 IP (tos 0x0, ttl 119, id 5030, offset 0, flags [none], proto UDP (17), length 107) client.65121 > w2k8r2onproxmox.7242: UDP, length 79
15:35:46.948125 IP (tos 0x0, ttl 119, id 5032, offset 0, flags [none], proto UDP (17), length 112) client.65121 > w2k8r2onproxmox.7242: UDP, length 84
15:35:47.049135 IP (tos 0x0, ttl 119, id 5036, offset 0, flags [none], proto UDP (17), length 117) client.65121 > w2k8r2onproxmox.7242: UDP, length 89
15:35:47.064325 IP (tos 0x0, ttl 119, id 5037, offset 0, flags [none], proto UDP (17), length 123) client.65121 > w2k8r2onproxmox.7242: UDP, length 95
15:35:47.165342 IP (tos 0x0, ttl 119, id 5041, offset 0, flags [none], proto UDP (17), length 128) client.65121 > w2k8r2onproxmox.7242: UDP, length 100
15:35:47.185206 IP (tos 0x0, ttl 119, id 5043, offset 0, flags [none], proto UDP (17), length 133) client.65121 > w2k8r2onproxmox.7242: UDP, length 105
15:35:47.284426 IP (tos 0x0, ttl 119, id 5047, offset 0, flags [none], proto UDP (17), length 138) client.65121 > w2k8r2onproxmox.7242: UDP, length 110
15:35:47.301670 IP (tos 0x0, ttl 119, id 5048, offset 0, flags [none], proto UDP (17), length 144) client.65121 > w2k8r2onproxmox.7242: UDP, length 116
15:35:47.400073 IP (tos 0x0, ttl 119, id 5052, offset 0, flags [none], proto UDP (17), length 151) client.65121 > w2k8r2onproxmox.7242: UDP, length 123
15:35:47.419614 IP (tos 0x0, ttl 119, id 5053, offset 0, flags [none], proto UDP (17), length 156) client.65121 > w2k8r2onproxmox.7242: UDP, length 128
15:35:47.518207 IP (tos 0x0, ttl 119, id 5056, offset 0, flags [none], proto UDP (17), length 162) client.65121 > w2k8r2onproxmox.7242: UDP, length 134
15:35:47.534548 IP (tos 0x0, ttl 119, id 5057, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.633848 IP (tos 0x0, ttl 119, id 5061, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.653762 IP (tos 0x0, ttl 119, id 5062, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.754688 IP (tos 0x0, ttl 119, id 5065, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.771650 IP (tos 0x0, ttl 119, id 5068, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.874630 IP (tos 0x0, ttl 119, id 5071, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.885856 IP (tos 0x0, ttl 119, id 5072, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:47.988044 IP (tos 0x0, ttl 119, id 5076, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.002770 IP (tos 0x0, ttl 119, id 5078, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.102616 IP (tos 0x0, ttl 119, id 5081, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.118603 IP (tos 0x0, ttl 119, id 5082, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.221958 IP (tos 0x0, ttl 119, id 5086, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.238872 IP (tos 0x0, ttl 119, id 5088, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.338114 IP (tos 0x0, ttl 119, id 5093, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.357808 IP (tos 0x0, ttl 119, id 5095, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.453726 IP (tos 0x0, ttl 119, id 5098, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.470281 IP (tos 0x0, ttl 119, id 5101, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.575986 IP (tos 0x0, ttl 119, id 5104, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.589719 IP (tos 0x0, ttl 119, id 5105, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.690893 IP (tos 0x0, ttl 119, id 5109, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.705384 IP (tos 0x0, ttl 119, id 5110, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.806582 IP (tos 0x0, ttl 119, id 5113, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.822809 IP (tos 0x0, ttl 119, id 5114, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.923270 IP (tos 0x0, ttl 119, id 5118, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:48.939045 IP (tos 0x0, ttl 119, id 5119, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.038236 IP (tos 0x0, ttl 119, id 5124, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.058119 IP (tos 0x0, ttl 119, id 5125, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.159456 IP (tos 0x0, ttl 119, id 5129, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.174627 IP (tos 0x0, ttl 119, id 5130, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.274672 IP (tos 0x0, ttl 119, id 5133, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.292307 IP (tos 0x0, ttl 119, id 5134, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.389378 IP (tos 0x0, ttl 119, id 5138, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139
15:35:49.405958 IP (tos 0x0, ttl 119, id 5139, offset 0, flags [none], proto UDP (17), length 167) client.65121 > w2k8r2onproxmox.7242: UDP, length 139

dunno if that sum ok got something to do, its like it fails when the lenght is bigger than 5x

 

[HellMind Zmaster]

Today the w2k8r2 lost connectivity, I Had to reboot the guest os.

How can I fix this

 

[e100]

The only suggestion I can think of is to use e1000 and also download the latest drivers from Intel and install those in the 2k8r2 machine.

 

[HellMind Zmaster]

To fix the lost connectivity issue I ve installed another virtio, (newer).

I tried to fix the udp issue with e1000 and latest intel driver but its the same.
Maybe I should upgrade kvm?

 

[HellMind Zmaster]

I think I found a way to test:

with iperf

On w2k8r2 and host:
iperf -u -s -p 7240

On a client:
iperf -u -p 7240 -c host -d -b 128K -m -l 135 -i 1--t 1000


How look when doing it against the host:

[ 3] 45.0-46.0 sec 15.7 KBytes 129 Kbits/sec 1.103 ms 0/ 119 (0%)
[ 4] 46.0-47.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 46.0-47.0 sec 15.6 KBytes 127 Kbits/sec 0.603 ms 0/ 118 (0%)
[ 4] 47.0-48.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 47.0-48.0 sec 15.7 KBytes 129 Kbits/sec 0.437 ms 0/ 119 (0%)
[ 4] 48.0-49.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 48.0-49.0 sec 15.4 KBytes 126 Kbits/sec 0.451 ms 0/ 117 (0%)
[ 4] 49.0-50.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 49.0-50.0 sec 15.8 KBytes 130 Kbits/sec 0.249 ms 0/ 120 (0%)
[ 4] 50.0-51.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 50.0-51.0 sec 15.6 KBytes 127 Kbits/sec 0.205 ms 0/ 118 (0%)
[ 4] 51.0-52.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 51.0-52.0 sec 15.3 KBytes 125 Kbits/sec 4.399 ms 0/ 116 (0%)
[ 4] 52.0-53.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 52.0-53.0 sec 16.0 KBytes 131 Kbits/sec 0.606 ms 0/ 121 (0%)
[ 4] 53.0-54.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 53.0-54.0 sec 15.7 KBytes 129 Kbits/sec 0.497 ms 0/ 119 (0%)
[ 4] 54.0-55.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 54.0-55.0 sec 15.6 KBytes 127 Kbits/sec 0.225 ms 0/ 118 (0%)
[ 4] 55.0-56.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 55.0-56.0 sec 15.7 KBytes 129 Kbits/sec 0.209 ms 0/ 119 (0%)
[ 4] 56.0-57.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 56.0-57.0 sec 15.6 KBytes 127 Kbits/sec 0.728 ms 0/ 118 (0%)
[ 4] 57.0-58.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 57.0-58.0 sec 15.7 KBytes 129 Kbits/sec 1.619 ms 0/ 119 (0%)
[ 4] 58.0-59.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 58.0-59.0 sec 15.6 KBytes 127 Kbits/sec 0.279 ms 0/ 118 (0%)
[ 4] 59.0-60.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 59.0-60.0 sec 15.7 KBytes 129 Kbits/sec 0.465 ms 0/ 119 (0%)
[ 4] 60.0-61.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 60.0-61.0 sec 15.6 KBytes 127 Kbits/sec 0.983 ms 0/ 118 (0%)
[ 4] 61.0-62.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 61.0-62.0 sec 15.7 KBytes 129 Kbits/sec 0.809 ms 0/ 119 (0%)
[ 4] 62.0-63.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 62.0-63.0 sec 15.7 KBytes 129 Kbits/sec 0.249 ms 0/ 119 (0%)
[ 4] 63.0-64.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 63.0-64.0 sec 15.6 KBytes 127 Kbits/sec 0.333 ms 0/ 118 (0%)
[ 4] 64.0-65.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 64.0-65.0 sec 15.7 KBytes 129 Kbits/sec 0.537 ms 0/ 119 (0%)
[ 4] 65.0-66.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 65.0-66.0 sec 15.6 KBytes 127 Kbits/sec 0.220 ms 0/ 118 (0%)
[ 4] 66.0-67.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 66.0-67.0 sec 15.7 KBytes 129 Kbits/sec 2.459 ms 0/ 119 (0%)
[ 4] 67.0-68.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 67.0-68.0 sec 15.6 KBytes 127 Kbits/sec 0.429 ms 0/ 118 (0%)
[ 4] 68.0-69.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 68.0-69.0 sec 15.7 KBytes 129 Kbits/sec 0.290 ms 0/ 119 (0%)
[ 4] 69.0-70.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 69.0-70.0 sec 15.6 KBytes 127 Kbits/sec 0.335 ms 0/ 118 (0%)
[ 4] 70.0-71.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 70.0-71.0 sec 15.7 KBytes 129 Kbits/sec 0.221 ms 0/ 119 (0%)
[ 4] 71.0-72.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 71.0-72.0 sec 15.6 KBytes 127 Kbits/sec 0.430 ms 0/ 118 (0%)
[ 4] 72.0-73.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 72.0-73.0 sec 15.7 KBytes 129 Kbits/sec 1.080 ms 0/ 119 (0%)
[ 4] 73.0-74.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 73.0-74.0 sec 15.6 KBytes 127 Kbits/sec 0.788 ms 0/ 118 (0%)
[ 4] 74.0-75.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 74.0-75.0 sec 15.7 KBytes 129 Kbits/sec 0.209 ms 0/ 119 (0%)
[ 4] 75.0-76.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 75.0-76.0 sec 15.6 KBytes 127 Kbits/sec 3.612 ms 0/ 118 (0%)
[ 4] 76.0-77.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 76.0-77.0 sec 15.7 KBytes 129 Kbits/sec 0.308 ms 0/ 119 (0%)
[ 4] 77.0-78.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 77.0-78.0 sec 15.6 KBytes 127 Kbits/sec 0.257 ms 0/ 118 (0%)
[ 4] 78.0-79.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 78.0-79.0 sec 15.7 KBytes 129 Kbits/sec 0.461 ms 0/ 119 (0%)
[ 4] 79.0-80.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 79.0-80.0 sec 15.6 KBytes 127 Kbits/sec 0.268 ms 0/ 118 (0%)
[ 4] 80.0-81.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 80.0-81.0 sec 15.7 KBytes 129 Kbits/sec 1.749 ms 0/ 119 (0%)
[ 4] 81.0-82.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 81.0-82.0 sec 15.6 KBytes 127 Kbits/sec 0.236 ms 0/ 118 (0%)
[ 4] 82.0-83.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 82.0-83.0 sec 15.7 KBytes 129 Kbits/sec 1.222 ms 0/ 119 (0%)
[ 4] 83.0-84.0 sec 15.7 KBytes 129 Kbits/sec
[

against the w2k8r2:

[ 4] 33.0-34.0 sec 15.0 KBytes 123 Kbits/sec
[ 4] 41.0-42.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 41.0-42.0 sec 14.9 KBytes 122 Kbits/sec 3.897 ms 0/ 113 (0%)
[ 4] 42.0-43.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 42.0-43.0 sec 15.3 KBytes 125 Kbits/sec 2.956 ms 1/ 116 (0.86%)
[ 3] 42.0-43.0 sec 1 datagrams received out-of-order
[ 4] 43.0-44.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 43.0-44.0 sec 15.3 KBytes 125 Kbits/sec 1.411 ms 0/ 116 (0%)
[ 4] 44.0-45.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 44.0-45.0 sec 15.2 KBytes 124 Kbits/sec 1.869 ms 0/ 115 (0%)
[ 4] 45.0-46.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 45.0-46.0 sec 14.5 KBytes 119 Kbits/sec 6.041 ms 0/ 110 (0%)
[ 4] 46.0-47.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 46.0-47.0 sec 15.2 KBytes 124 Kbits/sec 4.750 ms 0/ 115 (0%)
[ 4] 47.0-48.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 47.0-48.0 sec 15.0 KBytes 123 Kbits/sec 4.452 ms 0/ 114 (0%)
[ 4] 48.0-49.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 48.0-49.0 sec 14.8 KBytes 121 Kbits/sec 3.118 ms 0/ 112 (0%)
[ 4] 49.0-50.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 49.0-50.0 sec 15.0 KBytes 123 Kbits/sec 2.475 ms 0/ 114 (0%)
[ 4] 50.0-51.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 50.0-51.0 sec 14.9 KBytes 122 Kbits/sec 0.992 ms 0/ 113 (0%)
[ 4] 51.0-52.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 51.0-52.0 sec 15.6 KBytes 127 Kbits/sec 0.851 ms 0/ 118 (0%)
[ 4] 52.0-53.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 52.0-53.0 sec 15.4 KBytes 126 Kbits/sec 0.783 ms 0/ 117 (0%)
[ 4] 53.0-54.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 53.0-54.0 sec 15.4 KBytes 126 Kbits/sec 1.187 ms 0/ 117 (0%)
[ 4] 54.0-55.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 54.0-55.0 sec 15.6 KBytes 127 Kbits/sec 1.088 ms 0/ 118 (0%)
[ 4] 55.0-56.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 55.0-56.0 sec 15.3 KBytes 125 Kbits/sec 0.868 ms 0/ 116 (0%)
[ 4] 56.0-57.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 56.0-57.0 sec 15.3 KBytes 125 Kbits/sec 1.536 ms 0/ 116 (0%)
[ 4] 57.0-58.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 57.0-58.0 sec 15.6 KBytes 127 Kbits/sec 1.513 ms 0/ 118 (0%)
[ 4] 58.0-59.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 58.0-59.0 sec 14.8 KBytes 121 Kbits/sec 0.851 ms 0/ 112 (0%)
[ 4] 59.0-60.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 59.0-60.0 sec 14.9 KBytes 122 Kbits/sec 1.700 ms 1/ 113 (0.88%)
[ 3] 59.0-60.0 sec 1 datagrams received out-of-order
[ 4] 60.0-61.0 sec 15.7 KBytes 129 Kbits/sec
[ 3] 60.0-61.0 sec 15.6 KBytes 127 Kbits/sec 0.812 ms 0/ 118 (0%)
[ 4] 61.0-62.0 sec 15.6 KBytes 127 Kbits/sec
[ 3] 61.0-62.0 sec 15.2 KBytes 124 Kbits/sec 0.898 ms 0/ 115 (0%)

maybe this is the problem ?
datagrams received out-of-order

 

[HellMind Zmaster]

What settings do you recommend for w2k8r2 ?
Should I use e1000 or virtio?
What about vhost=on/off?

I need low latency for UDP

 

[softlion]

I've experienced over the past 2 years with virtio drivers (for network).
They are not stable under load and fails unexpectedly under some probably specific circumstances (the driver fails - the vm loose connectivity and needs a reboot).
It happened with all versions, and is really related to load with lots of different clients.

I have a machine which always has the e1000 interface with the OS driver and never lost connectivity under load (as intel drivers won't install, unlike what e100 wrote).

Since january i switched all machines to e1000 and never seen connectivity lost again.

I'm speaking about the virtio network drivers, not the virtio disk drivers which seems to work ok.

 

[holgihero]

I totally agree to softlion, same problems here w. virtio lan drivers and Win2008 (lost connections). Had no problems w. microsoft e1000 drivrs so far.

One thing differs: On one machine (HP Server w hw raid) I had problems w. virtio disk drivers (vm rebooted once a week) so i switched back to standard IDE which seems to work stable.

Regards, Holger