Date: Mon, 12 Jan 2004 16:59:26 -0800 From: Peter Losher <Peter_Losher@isc.org> To: current@freebsd.org Cc: Peter Losher <Peter_Losher@isc.org> Subject: FreeBSD 5.x performance tips (ISC) Message-ID: <200401121659.26614.Peter_Losher@isc.org>
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=2D----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 yo= u=20 helped out with some teething pains w/ virtual memory sizes, and kernel=20 panics. Thanks :) The issue with the system now is that while the kernel is SMP-aware, and as= I=20 watch 5.2-REL get downloaded today, this system is like the arm muscle that= =20 is developed to lift that barbell, but not enough blood is getting=20 everywhere, so the barbell is slowly moving up while the muscle cramps like= =20 hell. In this case the system is ~70% idle, and around 150 processes are=20 locked and the performance starts to seriously decrease at times. (Entropy= =20 stops getting collected, etc.) Not a pretty sight. The CPU's are all=20 spinlocking on an I/O channel. so high I/O translates into artificial high= =20 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?=20 Best Wishes - Peter =2D -- Peter_Losher@isc.org | ISC | OpenPGP 0xE8048D08 | "The bits must flow" =2D----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (FreeBSD) iD8DBQFAA0LuPtVx9OgEjQgRAkPiAKDE3eQ+kSxu3oj4EQgPHTggX8ZcrQCZAdc8 9H4a+dJi61Zty4E/VXV8Nos=3D =3Dct3f =2D----END PGP SIGNATURE-----
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