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Date:      Mon, 2 May 2011 12:03:54 +0300
From:      Nikolay Denev <ndenev@gmail.com>
To:        freebsd-net@freebsd.org
Subject:   Radix sorting bug affecting IPSec performance.
Message-ID:  <39B0B4EC-A41E-41FC-A03A-8B630CE167E3@gmail.com>
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This line from the OpenBSD 4.9 release notes attracted my attention : 
  "A radix tree sorting bug was fixed, which results in significant improvements to IPsec performance under certain conditions.|

And this seems to be the relevant commit : http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/radix.c?rev=1.28;sortby=date

Looking at the FreeBSD code it seems that is also affected, maybe it's a good idea to add their fix in FreeBSD :)

Regards,
Nikolay
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