From owner-freebsd-net Thu Oct 11 9:25:41 2001 Delivered-To: freebsd-net@freebsd.org Received: from smtp1.sentex.ca (smtp1.sentex.ca [199.212.134.4]) by hub.freebsd.org (Postfix) with ESMTP id A33BA37B408 for ; Thu, 11 Oct 2001 09:25:36 -0700 (PDT) Received: from simoeon.sentex.net (pyroxene.sentex.ca [199.212.134.18]) by smtp1.sentex.ca (8.11.6/8.11.6) with ESMTP id f9BGP9079091; Thu, 11 Oct 2001 12:25:09 -0400 (EDT) (envelope-from mike@sentex.net) Message-Id: <5.1.0.14.0.20011011121308.053ddc20@marble.sentex.ca> X-Sender: mdtpop@marble.sentex.ca X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Thu, 11 Oct 2001 12:19:01 -0400 To: Luigi Rizzo From: Mike Tancsa Subject: strange results with increased net.inet.ip.intr_queue_maxlen Cc: freebsd-net@freebsd.org In-Reply-To: <200110092255.f99Mtd195040@iguana.aciri.org> References: <5.1.0.14.0.20011009165532.0368b110@marble.sentex.ca> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Sender: owner-freebsd-net@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Queue drops generally corresponded to bandwidth. Charting the bandwidth going through the box and the rate at which queue drops increased certainly seemed to correspond. I didnt run any statistical analysis, as the visual correlation was very evident... But here is a strange result I dont quite understand. I increased net.inet.ip.intr_queue_maxlen from 50 to 100. and there didnt seem to be any positive results in terms of lessening the rate of net.inet.ip.intr_queue_drops. On another machine that also was showing drops, I decided to start tracking it as well. I increased net.inet.ip.intr_queue_maxlen to 256 unintentionally from the standard 50. However, this had the strange result of reducing the rate at which net.inet.ip.intr_queue_maxlen was increasing to zero. Huh ? Why would there not be a more gradual/measured effect ? Does this make sense? ---Mike At 03:55 PM 10/9/01 -0700, Luigi Rizzo wrote: > > Also, in terms of queue drops, the fastforwarding did make a small > > difference, but I still am seeing a series of drops somewhere between 5 > and > > 10min. If you think it would be useful to track down to see if it is > > exactly some interval, I can do so. > >it is dependent on external drive, anyways.. so the nice thing >to see perhaps would be run a 'netstat -i' every second and >see if there are evenly spaced traffic spikes. > > cheers > luigi > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message