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Date:      Thu, 21 Sep 2023 20:24:48 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 274007] IPSec asymmetric crypto broken
Message-ID:  <bug-274007-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D274007

            Bug ID: 274007
           Summary: IPSec asymmetric crypto broken
           Product: Base System
           Version: 13.2-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: tpearson@raptorengineering.com

After upgrading from FreeBSD 11 to FreeBSD 13, I noticed the IPSec asymmetr=
ic
crypto option (net.inet.ipsec.async_crypto=3D1) no longer functions correct=
ly.=20

On FreeBSD 11, enabling this option pushed the bandwidth of an accelerated
(AES-NI) AES 256 GCM tunnel from ~500Mbit/s to ~800Mbit/s with no packet lo=
ss,
but on FreeBSD 13 it causes massive packet loss inside the tunnel, well over
20%.

The hardware is AMD Opteron CPUs with Intel X520 10Gb NICs.  MTU on the
underlying link is set to 2000, with MTU inside the tunnel at the standard
1500.

--=20
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