Monitoring packet rate & softirq
Hi,
on a server running Debian Squeeze and keepalived I ran into some issues.
If I produce many requests against the server the amount of softirqs increases very fast until 1 CPU is at 100%.
I want to investigate this problem but I don't know of a tool to monitor the paket rate and the IPs causing it.
Also I need for this investigation a way to examine the softirqs, what's causing them, what are they waiting for and so on.
Does anyone of you know of such tools?
Kind regards,
Andrwe
marvn wrote:you can use iftop as a network monitor
Unfortunately iftop isn't able to monitor the packet rate but only the bandwidth.
There is quite a difference between both.
A network card can be able to process terabit/s but that doesn't mean it can process terapackets/s.
And if your system can't handle the packet rate it gets cpu load because of softirqs very fast.
While too much bandwidth is just cut at the maximum which can be handled and that can cause slowly increasing cpu load.
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I have a iPhone 5 that constantly switches back and for between 1.0Mb/s and 54.0Mb/s.
Is this any indication that the wifi is faulty on this phone? There are two other devices on the same ap
that are totally fine and maintain a constant rate.
Name: last-resort-FORD-6434259
Session ID: 23239
Global ID: SESS-23239-ab492e-948980-4ee
Login type: open
SSID: FORD
IP: 10.207.28.252
MAC: c8:bc:c8:b9:d9:2a
AP/Radio: 44/1 local-switching
State: ACTIVE
Session tag: 10
Host name: -
Vlan name: default (service profile)
Up time: 01:38:24
Roaming history:
Switch AP/Radio Association time Duration
10.134.1.109 44/1 05/07/13 13:49:40 01:38:25
Session Start: Tue May 7 13:49:41 2013 EDT
Last Auth Time: Tue May 7 13:49:40 2013 EDT
Last Activity: Tue May 7 15:27:57 2013 EDT ( <15s ago)
Session Timeout: 0
Idle Time-To-Live: 171
EAP Method: NONE, using server 10.134.1.109
Protocol: 802.11 WMM
Session CAC: disabled
Stats age: 0 seconds
Radio type: 802.11g
Last packet rate: 54.0 Mb/s
Last packet RSSI: -53 dBm
Last packet SNR: 42
Power Save: disabled
Voice Queue: ACTIVE
Packets Bytes
Rx Unicast 37527 3181096
Rx Multicast 2128 179452
Rx Encrypt Err 0 0
Tx Unicast 80053 110839580
Rx peak A-MSDU 0 0
Rx peak A-MPDU 0 0
Tx peak A-MSDU 0 0
Tx peak A-MPDU 0 0
Queue Tx Packets Tx Dropped Re-Transmit Rx Dropped
Background 0 0 0 0
BestEffort 79685 66 5905 0
Video 0 0 0 0
Voice 25 0 0 0
NMH-MX200# sh sessions network session-id 23239
1 of 450 sessions matched
Name: last-resort-FORD-6434259
Session ID: 23239
Global ID: SESS-23239-ab492e-948980-4ee
Login type: open
SSID: FORD
IP: 10.207.28.252
MAC: c8:bc:c8:b9:d9:2a
AP/Radio: 44/1 local-switching
State: ACTIVE
Session tag: 10
Host name: -
Vlan name: default (service profile)
Up time: 01:38:32
Roaming history:
Switch AP/Radio Association time Duration
10.134.1.109 44/1 05/07/13 13:49:40 01:38:33
Session Start: Tue May 7 13:49:41 2013 EDT
Last Auth Time: Tue May 7 13:49:40 2013 EDT
Last Activity: Tue May 7 15:28:11 2013 EDT ( <15s ago)
Session Timeout: 0
Idle Time-To-Live: 177
EAP Method: NONE, using server 10.134.1.109
Protocol: 802.11 WMM
Session CAC: disabled
Stats age: 0 seconds
Radio type: 802.11g
Last packet rate: 1.0 Mb/s
Last packet RSSI: -50 dBm
Last packet SNR: 45
Power Save: enabled
Voice Queue: ACTIVE
Packets Bytes
Rx Unicast 37538 3181569
Rx Multicast 2130 179556
Rx Encrypt Err 0 0
Tx Unicast 80057 110840129
Rx peak A-MSDU 0 0
Rx peak A-MPDU 0 0
Tx peak A-MSDU 0 0
Tx peak A-MPDU 0 0
Queue Tx Packets Tx Dropped Re-Transmit Rx Dropped
Background 0 0 0 0
BestEffort 79689 66 5905 0
Video 0 0 0 0
Voice 25 0 0 0
General attributes
SSID name: FORD
SSID type: crypto
Backup SSID
Mode: disable
Timeout: 0
Keep existing clients: enabled
11n attributes
11n Mode (na): required
11n Mode (ng): disabled
Guard Interval: short
Frame aggregation mode: all
MSDU Max length: 4k
MPDU Max length: 64k
Options
Auth: Fallthru last-resort
Mesh: None
L2: None
802.11: Beacon, Idle-client-probing
Crypto
WPA-IE
Authentication: PSK
Encryption: WPA
Cipher: TKIP (countermeasures time 60000 ms)
Pre-shared-key: 045e53005a221b1c5a4f52424b0809007f797c7e606c71105e425a5555080f05075f0549120f5c5 202045002590c575f0e52561700500f58515671191d5c4b5544
SSID attributes
Vlan name: default
Radio 1 (802.11ng)
Mode:
enabled
Radio profile:
FORD
Channel:
dynamic
Load balancing:
YES
Tx power:
14
Load balancing group:
Auto tune max power: default
Force rebalance:
NO
Antenna location:
indoors
Antenna type:
INTERNALUpdate: Most of the time the Last packet rate: is 1.0 Mb/s. The rate only improves to 54 once in a long while.
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ALL
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