clientReadRequest: FD xx Invalid Request

hello guys ,

        i searched the archives and didnt find a direct answer , here's my
problem .. i have this error in my log:

Apr 17 17:42:58 prophecy squid[12054]: clientReadRequest: FD 103 Invalid
Request
Apr 17 17:43:19 prophecy squid[12054]: clientReadRequest: FD 31 Invalid
Request
Apr 17 17:43:41 prophecy squid[12054]: clientReadRequest: FD 108 Invalid
Request

---- i'm using squid 2.3-stable2
with 1024 file descriptors ..

do i have to increase the file descriptor ?
i'm using kernel 2.2.14

and about the = I/O thread overload
how do i go about this ?

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