Skip site navigation (1)Skip section navigation (2)
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>

next in thread | previous in thread | raw e-mail | index | archive | help
> > 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.



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20071218181023.GW25053>