Date: Tue, 2 Jan 2001 15:54:02 -0800 From: Alfred Perlstein <bright@wintelcom.net> To: David Schwartz <davids@webmaster.com> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Processes stuck in 'nbufbs', what should be tuned? Message-ID: <20010102155402.F19572@fw.wintelcom.net> In-Reply-To: <NCBBLIEPOCNJOAEKBEAKKEAFMMAA.davids@webmaster.com>; from davids@webmaster.com on Tue, Jan 02, 2001 at 03:26:09PM -0800 References: <NCBBLIEPOCNJOAEKBEAKKEAFMMAA.davids@webmaster.com>
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* David Schwartz <davids@webmaster.com> [010102 15:26] wrote: > > One of my FreeBSD-stable machines (4.2-STABLE, Dec 12) seems to get into a > state where its performance drops to near-zero. I've raised MAXUSERS and > NMBCLUSTERS. According to 'netstat -m', it's not an mbuf issue. Swap isn't > touched, so it's not a memory issue. But I do see some processes blocked in > 'nbufbs'. > > I've tried to look at the code in vfs_bio.c to see what 'nbufbs' means, but > I can't quite make sense of it. Is there something I should tune? > > If it helps, the machine is running multithreaded network servers (using > the LinuxThreads port). The machine also has an AMI MegaRAID. It would help to see a full ps listing as well as the output from iostat around the time of the slowdown. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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