High ping and packet loss in local network
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talking about pinging say the console or mgmt switches from say another switch - neither would be very active – idle sucking juice is about all they wold be doing.. Now in a DC where the run might be 100ft, or quite possible they are next to each other in the rack but again patch panels to connect them most likely.
I wouldn't be doing it for anyone other than myself - I don't recall ever seeing those kinds of speed in any network I have worked on in 20+ years.. But then again maybe I just never pinged anything directly connected ;) Quite possible.
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I only do that to quickly test structured runs really. It's not indicative of real world practical applications but any major issues or interference generally shows.
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Try prioritizing icmp using the floating rules and see what you get. In practical terms, it does little but if it works then you know what to do to get the best effect on your setup.
@192.168.2.1-QOS_ENABLED:
TEST1
ping -c50 192.168.2.1
–- 192.168.2.1 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.117/1.591/14.669/3.278 ms
TEST2
–- 192.168.2.1 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.132/1.868/19.644/3.629 ms@192.168.1.254-QOS_ENABLED:
TEST1
ping -c50 192.168.1.254
–- 192.168.1.254 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.640/2.117/10.636/2.417 ms
TEST2
–- 192.168.1.254 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.609/1.666/12.005/1.936 ms@192.168.2.1-QOS_DISABLED:
TEST1
–- 192.168.2.1 ping statistics ---
50 packets transmitted, 48 packets received, 4.0% packet loss
round-trip min/avg/max/stddev = 0.105/4.136/46.755/8.910 msTEST2
–- 192.168.2.1 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.116/2.888/20.880/5.121 ms@192.168.1.254-QOS_DISABLED:
TEST1
ping -c50 192.168.1.254
–- 192.168.1.254 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.614/3.516/78.450/10.933 ms
TEST2
–- 192.168.1.254 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.646/2.797/30.649/4.756 msAnd what macs are you seeing on those IPs from arp -a on 2.5 pinging 2.1
arp -a
? (192.168.2.1) at 00:0d:61:79:54:d8 on em1_vlan13 expires in 1175 seconds [vlan]
? (192.168.2.5) at 00:26:55:e3:3f:67 on em1_vlan13 permanent [vlan]Yesterday i've also updated to snapshot 2.1.1, but no changes.
I think that the prioritization give some benefits, but the proble are not the ping (obviously) but the internet traffic that go through this links wich results slower.. So if QoS is working, there is a bottleneck somewhere in my box? It seems strange load is low and the connections too..
Moreover, even if QoS reduces the problem, this is still present, is inconceivable go from 0.117 ms latency to 14.669 ms. :/P.S. At this time (12.00am) every day ping and packet loss are worsen
PING 192.168.2.1 (192.168.2.1): 56 data bytes 64 bytes from 192.168.2.1: icmp_seq=0 ttl=64 time=49.547 ms 64 bytes from 192.168.2.1: icmp_seq=1 ttl=64 time=54.244 ms 64 bytes from 192.168.2.1: icmp_seq=2 ttl=64 time=51.494 ms 64 bytes from 192.168.2.1: icmp_seq=3 ttl=64 time=27.504 ms 64 bytes from 192.168.2.1: icmp_seq=4 ttl=64 time=119.251 ms 64 bytes from 192.168.2.1: icmp_seq=5 ttl=64 time=43.744 ms 64 bytes from 192.168.2.1: icmp_seq=7 ttl=64 time=8.241 ms 64 bytes from 192.168.2.1: icmp_seq=8 ttl=64 time=0.118 ms 64 bytes from 192.168.2.1: icmp_seq=9 ttl=64 time=90.099 ms --- 192.168.2.1 ping statistics --- 10 packets transmitted, 9 packets received, 10.0% packet loss round-trip min/avg/max/stddev = 0.118/49.360/119.251/35.273 mstop
last pid: 55487; load averages: 0.00, 0.03, 0.01 up 0+19:20:19 12:23:35 39 processes: 1 running, 38 sleeping CPU: 0.0% user, 0.0% nice, 0.4% system, 0.0% interrupt, 99.6% idle Mem: 63M Active, 213M Inact, 143M Wired, 1052K Cache, 112M Buf, 1570M FreeSwap:
vmstat -i
interrupt total rate irq1: atkbd0 3 0 irq14: ata0 57 0 irq19: uhci1+ 135782 1 cpu0: timer 27847076 399 irq256: em0 4073157 58 irq257: em1 44002413 631 irq258: em2 818545 11 irq259: em3 40608091 583 cpu3: timer 27847053 399 cpu2: timer 27847052 399 cpu1: timer 27847052 399 Total 201026281 2886/0 /1 /2 /3 /4 /5 /6 /7 /8 /9 /10
Load AverageInterface Traffic Peak Total
em1_vlan13 in 216.004 KB/s 233.244 KB/s 2.379 GB
out 10.831 KB/s 11.537 KB/s 1.078 GBem0_vlan10 in 0.146 KB/s 2.091 KB/s 175.861 MB
out 1.430 KB/s 13.097 KB/s 3.474 GBlo0 in 0.000 KB/s 0.000 KB/s 957.725 KB
out 0.000 KB/s 0.000 KB/s 957.725 KBem3 in 126.926 KB/s 165.866 KB/s 2.608 GB
out 316.054 KB/s 316.054 KB/s 702.344 MBem2 in 0.600 KB/s 0.600 KB/s 70.714 MB
out 0.744 KB/s 0.744 KB/s 286.328 MBem1 in 316.593 KB/s 316.593 KB/s 2.063 GB
out 123.062 KB/s 129.154 KB/s 2.080 GBem0 in 1.521 KB/s 4.879 KB/s 376.255 MB
netstat -i -b -n -I em1_vlan13
Name Mtu Network Address Ipkts Ierrs Idrop Ibytes Opkts Oerrs Obytes Coll em1_vlan13 1496 <link#11> 00:26:55:e3:3f:67 14875307 0 0 2561511047 8441171 72643 1157981020 0 em1_vlan13 1496 fe80::226:55f fe80::226:55ff:fe 0 - - 0 2 - 152 - em1_vlan13 1496 192.168.2.0/2 192.168.2.5 7945 - - 508860 20 - 1680 -</link#11>netstat -i -b -n -I em1
Name Mtu Network Address Ipkts Ierrs Idrop Ibytes Opkts Oerrs Obytes Coll em1 1500 <link#2> 00:26:55:e3:3f:67 32198966 0 0 2232366523 19473909 0 2238003408 0 em1 1500 fe80::226:55f fe80::226:55ff:fe 0 - - 0 1 - 96 - em1 1500 192.168.1.0/2 192.168.1.130 25921 - - 3280518 10 - 840 -</link#2> -
@bullet: I meant prioritizing the ping packets rather than to disable the qos as a whole. That is, for the purpose of testing, set floating rules on each interface with direction out, protocol icmp, source address of the interface and place in the highest priority queue.
Edit: By any chance, do you have Upperlimit, or Limiter, or PowerD with P4TCC, or any combination of those enabled?
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@dreamslacker
yes, i understand that, infact is what i've done!I've setted the traffic shaper with the wizard and it's automatically set a Upperlimit.
So now i tried to remove all the shaper and this is what i get:
–- 192.168.2.1 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.100/0.174/0.251/0.039 msSOLVED!!!! ;D ;D ;D ;D
ps: So now I only need to configure correctly the traffic shaping
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Glad you got your issue solved.. I want to do some more testing in my own DC, trying to find these sub .2 ms response times.. So couple of cisco switches yesterday I pinged from one to the other.. Now the IPs were SVI on a vlan, but switches not doing anything and directly connected was seeing .4 ms roughly.. Which is bit of difference from .1 ms ;)
I will be keeping an eye out.. I just personally don't recall seeing such low response times even just local lan with directly connected equipment unless you were pinging loopback, local IP, etc.
But I will be paying more attention in the future on the hunt ;)
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@dreamslacker
yes, i understand that, infact is what i've done!I've setted the traffic shaper with the wizard and it's automatically set a Upperlimit.
So now i tried to remove all the shaper and this is what i get:
–- 192.168.2.1 ping statistics ---
50 packets transmitted, 50 packets received, 0.0% packet loss
round-trip min/avg/max/stddev = 0.100/0.174/0.251/0.039 msSOLVED!!!! ;D ;D ;D ;D
ps: So now I only need to configure correctly the traffic shaping
I dislike the wizard, it never gives an optimal solution (nor should it since every use-case is different).
Nevertheless, you can run the wizard but remove all upperlimits in all queues once it's done. I've found that it increases latencies across the board (usually when it's active on the queue and occasionally at low loads) for some unknown reason.
I've settled on manually setting up my own queues and settings damn nearly since day 1 (pfSense 1.2rc2).
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Good call. :)
Time for a low ping contest Johnpoz?
Steve
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I dislike the wizard, it never gives an optimal solution (nor should it since every use-case is different).
Nevertheless, you can run the wizard but remove all upperlimits in all queues once it's done. I've found that it increases latencies across the board (usually when it's active on the queue and occasionally at low loads) for some unknown reason.
I've settled on manually setting up my own queues and settings damn nearly since day 1 (pfSense 1.2rc2).I will try your advice, thanks ;)
Glad you got your issue solved.. I want to do some more testing in my own DC, trying to find these sub .2 ms response times.. So couple of cisco switches yesterday I pinged from one to the other.. Now the IPs were SVI on a vlan, but switches not doing anything and directly connected was seeing .4 ms roughly.. Which is bit of difference from .1 ms ;)
I will be keeping an eye out.. I just personally don't recall seeing such low response times even just local lan with directly connected equipment unless you were pinging loopback, local IP, etc.
But I will be paying more attention in the future on the hunt ;)Thx :) I advice you to try to ping a zeroshell box! Just out of curiosity :D
