Reduced java/tomcat performance 6-beta3 -> 6-stable ?

[Eirik Øverby]

Firmware versions are equal. BIOS settings are equal.
However, a diff of the dmesgs show (apart from MAC address differences):

30c30
< Timecounter "ACPI-safe" frequency 3579545 Hz quality 1000
---
 > Timecounter "ACPI-fast" frequency 3579545 Hz quality 1000

What on earth is that all about? The "slow" box has the ACPI-fast  
timecounter...

/Eirik

On Nov 28, 2005, at 22:14 , Kris Kennaway wrote:

> On Mon, Nov 28, 2005 at 09:54:30PM +0100, Eirik ?verby wrote:
>> Hi,
>>
>> I think I have found the culprit. There must be some sort of
>> difference between the machines after all (BIOS revision?), because
>> while on one machine the interrupt rate for the bge card stays very
>> low (2 to be exact) during maximum load, the other machine goes
>> beyond 1000 and keeps rising constantly. This might also explain why
>> performance slowly degrades over time on that machine, and response
>> times vary wildly, while the "fast" machine responds nicely within
>> 1-2 seconds no matter the load and testing time.
>>
>> I will have to investigate this more closely. Is there a way to force
>> the NIC to polling mode (I'm assuming that is the difference, an IRQ
>> rate of 2 is too low for a heavily loaded server if the NIC is
>> interrupt-driven)?
>>
>> Anything else I could look at?
>
> BIOS update.
>
> Kris