[SQU] lots of peerPingTimeout in Event Queue

hi all,

    i have 3 proxy servers running squid 2.3.stable4 with each load
around 1K plus request per minute with identical hardware each one of
them. three of them are stable and doesnt die since last reboot. one of
my proxy servers suddenly increase its service time despite of the same
loads from the other two proxy servers. this sudden increase is
unpredictable. checking the logs, there are no unusual data that i saw
except when i look at the event queue under cachemgr.cgi, this proxy
server have lots of peerPingTimeout queue compare the other two proxy
servers. what are the causes for this? thanks.

fooler.

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