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Serial port driver generated mass of hardware Interrupts



Hello All,

I have an issue when I sent/received data from serial port by using minicom, the system generated lot of hardware interrupts (1,000,000.00 per second).

I'm using Red Hat Enterprise Linux WS version 6.2.
Is there any way in the kernel we can configure to increase the buffers sizes so the system cannot generate lot of hardware interrupts?

Below is the output of lspci from our serial port:
02:01.0 Bridge: PLX Technology, Inc. Device 9601 (rev ba)
Subsystem: PLX Technology, Inc. Device 9656
Flags: 66MHz, medium devsel, IRQ 26
Memory at c0280000 (32-bit, non-prefetchable)
I/O ports at 3000
Memory at c0260000 (32-bit, non-prefetchable) [size=128K]

Memory at c0240000 (32-bit, non-prefetchable) [size=128K]
Capabilities: [40] Power Management version 2
Capabilities: [48] CompactPCI hot-swap <?>
Capabilities: [4c] Vital Product Data
Kernel driver in use: xrserial
Please help.

Thanks in advance.
Last edited:
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