On May 24, 2002 13:40 -0400, Andreas Jung wrote: > From: "Andreas Dilger" <adilger@clusterfs.com> > > One simple question - does the increase in the load value actually > > affect squid performance? You say there is no increase in CPU > > utilization. That may be good or it may be bad, depending if the "idle" > > CPU is actually waiting on I/O to complete. > > > > What does the output of vmstat on both systems show? Please send two > > traces, one during low load and one during high load. > > Our big brother diagrams show that the CPU utilization remains *low* all > the time. I have been running vmstat on both machines when one of the > machine had a spike. But both machines showed more ore less identical > vmstat output: CPU was about 85% idle, no swapping, not much interrupts > and context switches. > In general, vmstat showed a perfect behaviour except that the load average > went up on one box. Then it is nothing to worry about. The "load average" does not indicate anything other than the number of processes runnable or waiting for disk I/O. It is likely that when you are doing a large journal flush the kjournald process is waiting for the disk I/O to complete, so it is counted 1 towards the load average. This in itself does not affect the performance of the system. Cheers, Andreas -- Andreas Dilger http://www-mddsp.enel.ucalgary.ca/People/adilger/ http://sourceforge.net/projects/ext2resize/
