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SubjectRe: Apache problem with 2.2.12 (network related)
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> The server is quite busy (25 req/s, load between 2 and 4). Every 10 or 15
> minutes the server completely stops accepting new HTTP requests, I can see
> the number of open TCP connections decrease from 1000 or more to a couple

But are there lots of requests in SYN_RECV queued ?

> apache immediately cures the problem. I have tried to compile Apache with
> and without -DSINGLE_LISTEN_UNSERIALIZED_ACCEPT option, no noticeable
> diffrence ...
>
> Any ideas ?

Turn on syn cookies in case its an attack triggering this
(echo "1" > /proc/sys/net/ipv4/tcp_syncookies )


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