Date: Tue, 18 Dec 2007 10:10:23 -0800 From: David G Lawrence <dg@dglawrence.com> To: Bruce Evans <brde@optusnet.com.au> Cc: freebsd-net@FreeBSD.org, freebsd-stable@FreeBSD.org Subject: Re: Packet loss every 30.999 seconds Message-ID: <20071218181023.GW25053@tnn.dglawrence.com> In-Reply-To: <20071218165732.GV25053@tnn.dglawrence.com> References: <D50B5BA8-5A80-4370-8F20-6B3A531C2E9B@eng.oar.net> <20071217103936.GR25053@tnn.dglawrence.com> <20071218170133.X32807@delplex.bde.org> <47676E96.4030708@samsco.org> <20071218233644.U756@besplex.bde.org> <20071218141742.GS25053@tnn.dglawrence.com> <20071219022102.I34422@delplex.bde.org> <20071218165732.GV25053@tnn.dglawrence.com>
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> > I got an almost identical delay (with 64000 vnodes). > > > > Now, 17ms isn't much. > > Says you. On modern systems, trying to run a pseudo real-time application > on an otherwise quiescent system, 17ms is just short of an eternity. I agree > that the syncer should be preemptable (which is what my bandaid patch > attempts to do), but that probably wouldn't have helped my specific problem > since my application was a user process, not a kernel thread. One more followup (I swear I'm done, really!)... I have a laptop here that runs at 150MHz when it is in the lowest running CPU power save mode. At that speed, this bug causes a delay of more than 300ms and is enough to cause loss of keyboard input. I have to switch into high speed mode before I try to type anything, else I end up with random typos. Very annoying. -DG David G. Lawrence President Download Technologies, Inc. - http://www.downloadtech.com - (866) 399 8500 The FreeBSD Project - http://www.freebsd.org Pave the road of life with opportunities.
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