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Oh my God! The Network's Slow!!!
By greenlaw
Published: December 19, 2007
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By greenlaw
Published: December 19, 2007
Print EmailResources:
1) The Linux documentation project (www.tldp.org).
Finding Problems:
1) For networking problems.. run wireshark.
2) for performance issues with mounts; run "dd" commands involving /dev/nul.
time dd if=/dev/zero of=/mnt/home/testfile bs=16k count=16384 //Tests Write performance
time dd if=/mnt/home/testfile of=/dev/null bs=16k //Tests read performance
Problems:
1) High Latency Links.. TCP/IP & NFS both have problems with high latency. Here's a suggestion:
i) set the TCP/IP Receive window to max in your protocol stack.
ii) Tell NFS to have a lot of transactions open at the same time. Set rwin & twin to 8192, or more if you can!. (http://nfs.sourceforge.net/nfs-howto/ar01s05.html)
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