Date: Fri, 07 May 2010 13:23:03 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: Syncache problem in FreeBSD 7.3-PRERELEASE Message-ID: <hs0t6d$k5u$1@dough.gmane.org> In-Reply-To: <4BE3A7EB.7060804@cs.ucla.edu> References: <4BE3A7EB.7060804@cs.ucla.edu>
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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.
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