Date: Fri, 28 Feb 2003 12:11:58 -0800 From: Lars Eggert <larse@ISI.EDU> To: John Polstra <jdp@polstra.com> Cc: mobile@freebsd.org Subject: Re: wi polling Message-ID: <3E5FC28E.1000905@isi.edu> In-Reply-To: <200302281944.h1SJibch031470@vashon.polstra.com> References: <20021022004219.V15421-100000@edge.foundation.invalid> <3E5F9C5A.3000503@isi.edu> <20030228.104434.70648014.imp@bsdimp.com> <3E5FB2C4.1020300@isi.edu> <200302281944.h1SJibch031470@vashon.polstra.com>
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[-- Attachment #1 --]
On 2/28/2003 11:44 AM, John Polstra wrote:
> In article <3E5FB2C4.1020300@isi.edu>, Lars Eggert <larse@ISI.EDU> wrote:
>
>>Sorry for being unclear: By "livelock" I mean the CPU spends all its
>>cycles on receive and hostap processing, to a point where userland
>>processes are starved. The box doesn't panic and becomes responsive
>>again when network load goes down.
>
> Are you using IPSec on the interface? I've noticed that's a
> reliable way to produce the symptoms you described.
Makes sense, IPsec increases the per-packet processing overhead
significantly.
I use IPsec on the box, but not on the interface: The box is an access
point/router, and the uplink is over an IPsec tunnel. However, the
livelock happens for local traffic between two wireless nodes. The
uplink capacity is too low to cause livelock.
Lars
--
Lars Eggert <larse@isi.edu> USC Information Sciences Institute
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