FreeBSD 5.x performance tips (ISC)
Peter_Losher at isc.org
Mon Jan 12 16:59:30 PST 2004
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So, as many of you know ISC hosts a quad-Xeon server running FreeBSD 5.1
(-p10 to be precise) which hosts half of ftp.freebsd.org, etc. Many of you
helped out with some teething pains w/ virtual memory sizes, and kernel
panics. Thanks :)
The issue with the system now is that while the kernel is SMP-aware, and as I
watch 5.2-REL get downloaded today, this system is like the arm muscle that
is developed to lift that barbell, but not enough blood is getting
everywhere, so the barbell is slowly moving up while the muscle cramps like
hell. In this case the system is ~70% idle, and around 150 processes are
locked and the performance starts to seriously decrease at times. (Entropy
stops getting collected, etc.) Not a pretty sight. The CPU's are all
spinlocking on an I/O channel. so high I/O translates into artificial high
cpu and load averages.
So where can I look for pointers on how I can squeeze better performance out
of this configuration? I already have the usual sysctl entries installed.
Any chance moving to 5.2 will help the situation?
Best Wishes - Peter
Peter_Losher at isc.org | ISC | OpenPGP 0xE8048D08 | "The bits must flow"
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