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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This is a cryptographically signed message in MIME format. --------------ms040602060606090700080205 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit 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 --------------ms040602060606090700080205 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJtjCC AzgwggKhoAMCAQICEGZFcrfMdPXPY3ZFhNAukQEwDQYJKoZIhvcNAQEEBQAwgdExCzAJBgNV BAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUgVG93bjEaMBgG A1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRpb24gU2Vydmlj ZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBDQTErMCkG CSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0wMDA4MzAwMDAw MDBaFw0wNDA4MjcyMzU5NTlaMIGSMQswCQYDVQQGEwJaQTEVMBMGA1UECBMMV2VzdGVybiBD YXBlMRIwEAYDVQQHEwlDYXBlIFRvd24xDzANBgNVBAoTBlRoYXd0ZTEdMBsGA1UECxMUQ2Vy dGlmaWNhdGUgU2VydmljZXMxKDAmBgNVBAMTH1BlcnNvbmFsIEZyZWVtYWlsIFJTQSAyMDAw 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