> I am trying to get your point and i really can't. I just don't see what > your are trying to say. If you refer to 8% CPU usage then i see that it > is only 8% because SCSI is the bottleneck. Disk just do not give data > fast enough to load CPU high. Also, i don't think the do not give > data fast enough only because of the Giant. I think it is mostly scsi > and hdd speed problem in this case. Afterall md5 algorithm is not > too havy on cpu anyway. What I was trying to point out is that there is hardly any concurrency with disk drivers on a SMP box. With 4 controllers, 8 spindles, and 4 cpus to drive them, one would expect a little bit of concurrency. Instead, the kernel spends most of its time waiting or blocked, only one disk is accessed at a time, and the cpus stay idle. md5 may have been a bad example, but on a slow 200MHz cpu, it can be a fairly intensive cpu hog. -- :{ andyf_at_speednet.com.au Andy Farkas System Administrator Speednet Communications http://www.speednet.com.au/Received on Tue Apr 06 2004 - 00:39:35 UTC
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