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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