Date: Mon, 07 Aug 2000 21:24:01 -0400 From: Dennis <dennis@etinc.com> To: Mike Smith <msmith@freebsd.org> Cc: hackers@freebsd.org Subject: Re: FreeBSD belly up with big config Message-ID: <Version.32.20000807130801.01d386a0@etinc.com> In-Reply-To: <200008070654.XAA01626@mass.osd.bsdi.com> References: <Your message of "Sat, 05 Aug 2000 13:21:47 EDT." <200008051708.NAA00486@etinc.com>
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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
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