Windows 2008r2 2k8r2 udp

H

HellMind Zmaster

Active Member
Jul 8, 2011
33
7
28
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).
 
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
 
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
 
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
Click to expand...
dunno if that sum ok got something to do, its like it fails when the lenght is bigger than 5x
 
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?
 
Last edited:
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
[
Click to expand...

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%)
Click to expand...

maybe this is the problem ?
datagrams received out-of-order
 
What settings do you recommend for w2k8r2 ?
Should I use e1000 or virtio?
What about vhost=on/off?

I need low latency for UDP
 
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.
 
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
 
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