From owner-freebsd-hackers Mon Aug 7 18:10:20 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from etinc.com (et-gw.etinc.com [207.252.1.2]) by hub.freebsd.org (Postfix) with ESMTP id 236BF37B51B; Mon, 7 Aug 2000 18:10:17 -0700 (PDT) (envelope-from dennis@etinc.com) Received: from dbsys (dbsys.etinc.com [207.252.1.18]) by etinc.com (8.9.3/8.9.3) with SMTP id VAA06151; Mon, 7 Aug 2000 21:11:42 -0400 (EDT) Message-Id: X-Sender: dennis@etinc.com X-Mailer: QUALCOMM Windows Eudora Pro Version 4.0 Date: Mon, 07 Aug 2000 21:24:01 -0400 To: Mike Smith From: Dennis Subject: Re: FreeBSD belly up with big config Cc: hackers@freebsd.org In-Reply-To: <200008070654.XAA01626@mass.osd.bsdi.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG At 11:54 PM 8/6/00 -0700, Mike Smith wrote: >> 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 How do I do this in 4.1? I have a test bed set up that demonstrates the problem. Dennis To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message