needed help in interpreting results

Hi,

Some time ago I've made series of tests on Squid-2.5STABLE5. I wanted 
confirm and verify results obtained by Duane Wessels in his book about 
Squid. Duane measured how Squid performace can depends on filesystem 
performance. I took all tests on the same machine in  identical 
environment but I obtained strange results for COSS (coss.png). 


Could someone interpret this results? Is anyone who can give me 
explaination about this periodical peak in response time? Adjustment 
algorithm in the workload (attached file pm4-pf2.pg) take care about 
misses and hits and take action when value exceeds or fell below, 
respectively, 3.0 and 0.25 sec. At second image (diskd.png) which contains 
trace for diskd there is no similar peak.


Thanks in advance,
Peter

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