MikroTik

Occasionally, I have very slow response from my SSH session.
As if the system has suspended the operation for a few seconds (10-15 secs) and resumed.
Sometimes it disconnect my Winbox and SSH session.
When it happened, it didn't even response when I press "Enter" key.

It feels like when you do a "debug all" on Cisco router.
But the cpu-load on my router is 0 or 1.
System capacity is way way plentiful.
I checked system log, it shows nothing significant (like dhcp leases, etc)

This router doesn't do anything fancy, just a LAN router with 7 ethernet interfaces running DHCP server for each interface.

Has anyone encountered similar experience before? Thanks.



uptime: 6d19h9m22s
version: "2.9.50"
free-memory: 878820kB
total-memory: 905768kB
cpu: "Intel(R)"
cpu-frequency: 2992MHz
cpu-load: 1
free-hdd-space: 76841264kB
total-hdd-space: 76904380kB
write-sect-since-reboot: 761680
write-sect-total: 5625856


IRQ OWNER
1 keyboard
2 APIC
5 [usb-uhci]
5 L6
7 L4
7 L5
8 [rtc]
10 INTERNET
11 L1
14 IDE 1
15 L2
15 L3


PORT-RANGE OWNER
0x20-0x3F APIC
0x40-0x43 [timer0]
0x50-0x53 [timer1]
0x60-0x6F keyboard
0x70-0x7F [rtc]
0x80-0x8F DMA
0xA0-0xBF APIC
0xC0-0xDF DMA
0xF0-0xFF FPU
0x1F0-0x1F7 IDE 1
0x3C0-0x3DF VGA
0x3F6-0x3F6 IDE 1
0x500-0x51F Intel Corporation I/O Controller Hub SMBus
0xCF8-0xCFF [PCI conf1]
0xA000-0xAFFF [PCI Bus #06]
0xAE00-0xAE1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xAE00-0xAE1F [e100]
0xAF00-0xAF1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xAF00-0xAF1F [e100]
0xB000-0xBFFF [PCI Bus #05]
0xBE00-0xBE1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xBE00-0xBE1F [e100]
0xBF00-0xBF1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xBF00-0xBF1F [e100]
0xC000-0xCFFF [PCI Bus #04]
0xCE00-0xCE1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xCE00-0xCE1F [e100]
0xCF00-0xCF1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xCF00-0xCF1F [e100]
0xD000-0xDFFF [PCI Bus #03]
0xDE00-0xDE1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xDE00-0xDE1F [e100]
0xDF00-0xDF1F Intel Corporation 82557/8/9 [Ethernet Pro 100]
0xDF00-0xDF1F [e100]
0xE000-0xEFFF [PCI Bus #01]
0xEF00-0xEF1F Intel Corporation unknown device
0xEF00-0xEF1F [e1000]
0xF800-0xF80F Intel Corporation I/O Controller Hub PATA
0xFE00-0xFE1F Intel Corporation I/O Controller Hub UHCI USB #1
0xFE00-0xFE1F [usb-uhci]
0xFF00-0xFF07 Intel Corporation Integrated Graphics Controller

found the answer to this problem: It's due to IRQ conflict.

When conflict occurred, the router "lost" its mind for a few second before resume the operation.