Date: Thu, 11 Oct 2001 12:19:01 -0400 From: Mike Tancsa <mike@sentex.net> To: Luigi Rizzo <rizzo@aciri.org> Cc: freebsd-net@freebsd.org Subject: strange results with increased net.inet.ip.intr_queue_maxlen Message-ID: <5.1.0.14.0.20011011121308.053ddc20@marble.sentex.ca> In-Reply-To: <200110092255.f99Mtd195040@iguana.aciri.org> References: <5.1.0.14.0.20011009165532.0368b110@marble.sentex.ca>
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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
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