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Network Latency Issue on 2 Servers

BashedRoot
Level 2
Level 2

I'm having these strange network latency, crawling speed issues on a couple of Dell R610 servers I have. I have multiple other R610's with same specs, connected to the same Cisco 3750 switch and they're fine. I've done a lot of troubleshooting and still cannot fix the problem. I would appreciate help here. My observium shows no spikes on my network or aggressive traffic on any other server that would cause some bottle-necking of any kind.

1. Tried replacement NIC cards
2. Tried multiple ports on server NIC and Cisco switch
3. Tried Centos 6.8 and Centos 7
4. Upgraded NIC drivers via Dell OMSA
5. Replaced Cat5 cables
6. Rebooted Servers
7. GigE enabled on server and Cisco switch, full duplex
8. Tried both Google resolvers and data center resolvers


Public speed test though are so slow

Code:
[root@localhost ~]# wget -O /dev/null http://cachefly.cachefly.net/100mb.test
--2016-07-05 13:32:59--  http://cachefly.cachefly.net/100mb.test
Resolving cachefly.cachefly.net (cachefly.cachefly.net)... 205.234.175.175
Connecting to cachefly.cachefly.net (cachefly.cachefly.net)|205.234.175.175|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 104857600 (100M) [application/octet-stream]
Saving to: ‘/dev/null’

0% [                                                                                                                                                                                                    ] 162,475     24.4KB/s  eta 73m 24s

Installed Dell OMSA this way:

Code:
INSTALL Dell System Update (DSU) AND OpenManage Server Administrator
---------------------------------------------------------------------

yum install perl wget -y
wget -q -O - https://linux.dell.com/repo/hardware/dsu/bootstrap.cgi | bash
yum install dell-system-update -y
yum install srvadmin-all -y
/opt/dell/srvadmin/sbin/srvadmin-services.sh start
dsu -u
1 Reply 1

BashedRoot
Level 2
Level 2

On the other proper working servers, a 30MB/ps is common or greater. GigE uplink. On these 2 servers, 200Kb/s or less is common and the issue. I can rarely break 1MB/s. I did a quick intranet test, doing scp from my NAS to one of the problematic servers, slow 300-400KB/s transfer. NAS to a good server via intranet, scp method is normal 20-30+MB/s transfer. No QoS, NAT on switch. I have dual failover drops (Ethernet) from the data center upstream (blended bandwidth).These are Broadcom NICs. The servers are running with SSD, RAID 0 on H700 PERC. I have similar good servers with the same exact config with no issue.

[root@server2 ~]# lspci -v | grep Ethernet -A 1
01:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
        Subsystem: Dell PowerEdge R610 BCM5709 Gigabit Ethernet
        Flags: bus master, fast devsel, latency 0, IRQ 36
--
01:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
        Subsystem: Dell PowerEdge R610 BCM5709 Gigabit Ethernet
        Flags: bus master, fast devsel, latency 0, IRQ 48
--
02:00.0 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
        Subsystem: Dell PowerEdge R610 BCM5709 Gigabit Ethernet
        Flags: bus master, fast devsel, latency 0, IRQ 32
--
02:00.1 Ethernet controller: Broadcom Corporation NetXtreme II BCM5709 Gigabit Ethernet (rev 20)
        Subsystem: Dell PowerEdge R610 BCM5709 Gigabit Ethernet
        Flags: bus master, fast devsel, latency 0, IRQ 42
[root@server2 ~]# ethtool em1
Settings for em1:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 1000Mb/s
        Duplex: Full
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off
        Supports Wake-on: g
        Wake-on: d
        Link detected: yes
[root@localhost ~]# ethtool -i em1
driver: bnx2
version: 2.2.6
firmware-version: 7.12.19 bc 7.10.0 NCSI 2.0.13
bus-info: 0000:01:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: no   

Output from switch on the 2 ports...

Cisco3750#show interface Gi1/0/13
GigabitEthernet1/0/13 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 001f.6c8a.938d (bia 001f.6c8a.938d)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 0 bits/sec, 0 packets/sec
  5 minute output rate 1000 bits/sec, 1 packets/sec
     23470 packets input, 5854358 bytes, 0 no buffer
     Received 12 broadcasts (5 multicasts)
Cisco3750#show interface Gi1/0/12
GigabitEthernet1/0/12 is up, line protocol is up (connected)
  Hardware is Gigabit Ethernet, address is 001f.6c8a.938c (bia 001f.6c8a.938c)
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output 00:00:01, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 3000 bits/sec, 5 packets/sec
  5 minute output rate 182000 bits/sec, 6 packets/sec
     286214 packets input, 35687041 bytes, 0 no buffer
     Received 29 broadcasts (23 multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 23 multicast, 0 pause input
     0 input packets with dribble condition detected
     479017 packets output, 484189224 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

Cisco VLAN  Output

VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
2    VLAN2                            active    Gi1/0/13
93   VLAN93                           active    Gi1/0/12
Cisco3750#show run interface g1/0/12
Building configuration...

Current configuration : 115 bytes
!
interface GigabitEthernet1/0/12
switchport access vlan 93
switchport mode access
speed 1000
duplex full
end

Cisco3750#show run interface g1/0/13
Building configuration...

Current configuration : 114 bytes
!
interface GigabitEthernet1/0/13
switchport access vlan 2
switchport mode access
speed 1000
duplex full
end