Hi Paul,

   What is the configuration of your xrootd system?  How many data servers, redirector etc.



On 10/07/2011 02:37 PM, Paul T. Keener wrote:
> Lukasz,
>> 2011/10/7 Paul T. Keener <[log in to unmask]>:
>>> I see load averages of 140 to 200 or more and I see a high percent of CPU
>>> time in wait states (70-80%) with a large number of interrupts (10-15K),
>>> both of these reported by dstat.
>> Hi Paul,
>>    if a significant fraction of the CPU is used by ksoftirqd it's
>> usually an indication that the kernel has troubles managing the
>> interrupts coming from the NIC (too much data coming from or going to
>> the wire). If possible, try to put the network driver for your device
>> in polling mode (the kernel then devotes one core to handling the
>> stuff coming from NIC and disables the NIC's interrupts), you should
>> see an improvement.
> I will look at this, but if it really is a network problem, wouldn't I see it regardless of which xrootd namespace I 
> was talking to?
> Thanks.
>     -paul