Re: Gigabit/SMP performance problem

Brian Tinsley
2003-01-06T19:17:57Z

I've been able to distribute IRQ servicing to other processors on P4
Xeon HT systems as described in the IRQ-affinity.txt file in the
kernel-source Documentation directory. Well, it shows up as doing so in
/proc/interrupts anyway! Looks like CPUs 0, 2, 4, etc.. are the real
processors and 1,3,5, etc.. are the logical processors (which do not
handle interrupts).

Daniel Blueman wrote:

>Even with HT turned off on this dual-Xeon box, all IRQs are routed to CPU 0.
>
>Kernel here is the latest RedHat 2.4.18 one.
>
>Just curious what kernel Avery is running...
>
>Dan
>
>
>
>>On 4 Jan 2003, Daniel Blueman wrote:
>>
>>
>>
>>>It's interesting you have IRQs balanced over the two logical
>>>processors. I can't get this on HT Xeons with stock RedHat 7.3 kernel.
>>>
>>>
>>I think he's using two physical processors, if by "logical processors" you
>>are thinking HT... I also recall he has HT off, but the original post
>>isn't handy.
>>
>>
>>
>>>Can you post the exact kernel version string, please?
>>>
>>>TIA,
>>> Dan
>>>
>>>"Avery Fay" <avery_fay@symantec.com> wrote in message
>>>
>>>
>news:<OF256CD297.9F92C038-ON85256CA3.006A4034-85256CA3.00705DEA@symantec.com>...
>
>
>>>>Dual Pentium 4 Xeon at 2.4 Ghz. I believe I am using irq load
>>>>
>>>>
>>balancing as
>>
>>
>>>>shown below (seems to be applied to Red Hat's kernel). Here's
>>>>/proc/interrupts:
>>>>
>>>>
>>--
>>bill davidsen <davidsen@tmr.com>
>> CTO, TMR Associates, Inc
>>Doing interesting things with little computers since 1979.
>>
>>
>>
>
>
>

--

-[========================]-
-[ Brian Tinsley ]-
-[ Chief Systems Engineer ]-
-[ Emageon ]-
-[========================]-