[Lustre-discuss] socknal_sd00 100% lower?

[Liang Zhen]

Hi Brock,
As Andreas said, change it by proc wouldn't affect any existed 
connections , but it will affect new connections.

Regards
Liang

Brock Palen wrote:
>> echo 0 > /sys/modules/ksocklnd/{parameters}/enable_irq_affinity
>>     
>
> I set the option,  'cat' confirms it was set, so far i see no effect  
> (zero cpu time on 01)  but I will keep a eye on it.
>   
>> The "{parameters}" subdir is present or not, depending on the kernel
>> version (yay consistency!).
>>
>> That said, it is implementation dependent on whether changing the
>> parameter after the module is loaded has any effect.  I suspect in
>> this case it will not have any effect because the kernel threads
>> are already bound to their CPUs, but this isn't my strongest area.
>>
>> Maxim, Isaac, what are your thoughts about disabling IRQ affinity
>> by default?  In the past this was important for maximizing performance
>> with N CPUs and N ethernet NICs, but the CPUs have gotten much faster
>> and more cores and I believe other customers have found better  
>> performance
>> with irq_affinity disabled.
>>
>> Cheers, Andreas
>> --
>> Andreas Dilger
>> Sr. Staff Engineer, Lustre Group
>> Sun Microsystems of Canada, Inc.
>>
>>
>>
>>     
>
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