From owner-freebsd-hackers Sun Aug 6 23:43: 2 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from mass.osd.bsdi.com (adsl-63-202-177-42.dsl.snfc21.pacbell.net [63.202.177.42]) by hub.freebsd.org (Postfix) with ESMTP id 81A0D37B509 for ; Sun, 6 Aug 2000 23:43:00 -0700 (PDT) (envelope-from msmith@mass.osd.bsdi.com) Received: from mass.osd.bsdi.com (localhost [127.0.0.1]) by mass.osd.bsdi.com (8.9.3/8.9.3) with ESMTP id XAA01626; Sun, 6 Aug 2000 23:54:11 -0700 (PDT) (envelope-from msmith@mass.osd.bsdi.com) Message-Id: <200008070654.XAA01626@mass.osd.bsdi.com> X-Mailer: exmh version 2.1.1 10/15/1999 To: Dennis Cc: hackers@freebsd.org Subject: Re: FreeBSD belly up with big config In-reply-to: Your message of "Sat, 05 Aug 2000 13:21:47 EDT." <200008051708.NAA00486@etinc.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 06 Aug 2000 23:54:11 -0700 From: Mike Smith Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > With 1800 interfaces in the system Freebsd seems to use about 50Mhz of cpu > when idle in "interrupts" even when there are no interrupts to process. on > a 500Mhz box it uses 10% of the cpu and it seems linear with different > speed processors. > > the 1800 interfaces are 900 DLCIs on a T3 frame with 900 bridge groups > (rather common for a DSL delivered via Frame). This with just one > line...the same problem could occur with say 8 T1 lines with 100+ DLCIs on > each. > > It seems that there is substantial overhead just scanning interfaces for > some routine maintenance...is there any hope of alleviating this deboggle? Probably. Without some idea of what's actually happening, though, it's a little hard to point a finger and say "look here". A profiling dump of the system when idle would be very illuminating, as it'd give you a good idea of what's actually going on to use so much CPU. -- ... every activity meets with opposition, everyone who acts has his rivals and unfortunately opponents also. But not because people want to be opponents, rather because the tasks and relationships force people to take different points of view. [Dr. Fritz Todt] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message