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

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Message-ID: <D12839161ADD3A4B8DA63D1A134D084026E48BA5A9@ESGSCCMS0001.eapac.ericsson.se>
Date:	Fri, 8 Apr 2011 17:15:51 +0800
From:	Wei Gu <wei.gu@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.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

Yeap, you are right, right now I will try the CONFIG_DMAR off:)

If you guys know the relation between CONFIG_DMAR and CONFIG_DMAR_DEFAULT_ON, please let me know:)

Thanks
WeiGu

-----Original Message-----
From: Eric Dumazet [mailto:eric.dumazet@...il.com]
Sent: Friday, April 08, 2011 5:08 PM
To: Wei Gu
Cc: Alexander Duyck; netdev; Kirsher, Jeffrey T
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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