netdev - RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

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Date:	Fri, 08 Apr 2011 11:07:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wei Gu <wei.gu@...csson.com>
Cc:	Alexander Duyck <alexander.h.duyck@...el.com>,
	netdev <netdev@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

Le vendredi 08 avril 2011 à 16:59 +0800, Wei Gu a écrit :
> Hi,
> On my configuration of Linux 2.6.38 we do enabled the CONFIG_DMAR
> CONFIG_DMAR=y
> CONFIG_DMAR_DEFAULT_ON=y
> CONFIG_DMAR_FLOPPY_WA=y
> CONFIG_INTR_REMAP=y
> 
> 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=y
> # CONFIG_DMAR_DEFAULT_ON is not set
> CONFIG_DMAR_FLOPPY_WA=y
> CONFIG_INTR_REMAP=y
> 
> 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 we
> 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.



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