From owner-freebsd-questions Tue Jan 2 15:54: 5 2001 From owner-freebsd-questions@FreeBSD.ORG Tue Jan 2 15:54:03 2001 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from fw.wintelcom.net (ns1.wintelcom.net [209.1.153.20]) by hub.freebsd.org (Postfix) with ESMTP id 8B69537B400 for ; Tue, 2 Jan 2001 15:54:03 -0800 (PST) Received: (from bright@localhost) by fw.wintelcom.net (8.10.0/8.10.0) id f02Ns2F07155; Tue, 2 Jan 2001 15:54:02 -0800 (PST) Date: Tue, 2 Jan 2001 15:54:02 -0800 From: Alfred Perlstein To: David Schwartz Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Processes stuck in 'nbufbs', what should be tuned? Message-ID: <20010102155402.F19572@fw.wintelcom.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from davids@webmaster.com on Tue, Jan 02, 2001 at 03:26:09PM -0800 Sender: bright@fw.wintelcom.net Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG * David Schwartz [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