From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Dumazet <eric.dumazet@gmail.com>
Subject: RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel
Date: Fri, 08 Apr 2011 11:07:30 +0200
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Cc: Alexander Duyck <alexander.h.duyck@intel.com>,
	netdev <netdev@vger.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@intel.com>
To: Wei Gu <wei.gu@ericsson.com>
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Le vendredi 08 avril 2011 =C3=A0 16:59 +0800, Wei Gu a =C3=A9crit :
> Hi,
> On my configuration of Linux 2.6.38 we do enabled the CONFIG_DMAR
> CONFIG_DMAR=3Dy
> CONFIG_DMAR_DEFAULT_ON=3Dy
> CONFIG_DMAR_FLOPPY_WA=3Dy
> CONFIG_INTR_REMAP=3Dy
>=20
> But I enabled this DMAR also by default of the RHEL6 2.6.32 kernel,
> which we don't see this problem on this kernel. The only different I
> can see on the config is "CONFIG_DMAR_DEFAULT_ON"
> CONFIG_DMAR=3Dy
> # CONFIG_DMAR_DEFAULT_ON is not set
> CONFIG_DMAR_FLOPPY_WA=3Dy
> CONFIG_INTR_REMAP=3Dy
>=20
> I could try the same configuration as 2.6.32 for the 2.6.38 kernel by
> unset the CONFIG_DMAR_DEFAULT_ON. And run the test again, hopefully w=
e
> can get the test result next Monday:)

Just say no to CONFIG_DMAR, end of problems, no need to try various
knobs and find the solution next month ;)

Unless you have a reason to use it.