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Subject: Re: Syncache problem in FreeBSD 7.3-PRERELEASE
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On 05/07/10 07:40, Zhenkai Zhu wrote:
> Hi,
>
> I'm experiencing some problem of syncache (probably).
>
> We have a NFS server which exports everyone's home directory, and I'm
> developing my Qualnet code on another machine (NFS client) under my home
> directory. However, when I make my code, linking takes extremely long
> time (it takes more than 5 minutes while on my laptop it only takes 15
> seconds). I examed the /var/log/messages on the NFS server and it was
> like this:
>
> May 6 19:51:49 raptors kernel: TCP: [131.179.96.24]:985 to
> [131.179.96.25]:2049 tcpflags 0x10<ACK>; syncache_expand: Segment failed
> SYNCOOKIE authentication, segment rejected (probably spoofed)
>
> The above message appears every time I make my code ( and only when I
> make my code). I turned on linux binary compatiblity on the NFS client
> because Qualnet needs to be run in that mode.
>
> Here are some more details: both the NFS server and client are amd64
> machines. The server has 8 cpus and the client has 16 cpus.
>
> Any one can help me out? Thanks!!!

What does your net.inet.tcp.syncache.count show?

Actually, sending the output of sysctl net.inet.tcp | grep syn would 
probably help.