 |
 |
Hi Paul, What is the configuration of your xrootd system? How many data servers, redirector etc. thanks, Doug 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